Haoran Geng

• Doctor of Engineering
• Research Director at University of Jinan

This work reports the refinement of nanoporous copper (NPC) ligaments by introducing the sodium dodecyl sulfate (SDS) surfactant in the dealloying process. The Al 80 Cu 20 (at%) alloy precursor is chemically dealloyed in a mixed solution of NaOH and SDS surfactant, producing NPC with a hierarchical microstructure. Micron-scaled skeletons that build...

The inhibition of gravity segregation has been a long-standing challenge in fabrication and applications of homogeneous immiscible alloys. Therefore, the effect of rare-earth La on the gravity segregation of Al–Bi immiscible alloys was investigated to understand the homogenization mechanism. The results showed that the addition of La can completely...

As-cast Mg-3Er-xZn (x = 0, 0.5, 1 and 2 at.%) alloys were prepared by a cast ingot metallurgy process. The effect of Zn contents on the microstructure and phase constitution of the alloys was investigated by optical microscope (OM), scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and transmission el...

In this paper, the liquid phase separation and solidification process of the Al75Bi9Sn16 immiscible alloy were studied with calorimetric and resistivity methods to make the melt superheated treatment process. The impact of melt overheating treatment (MOT) on the phase constitution and solidification microstructures were investigated using X-Ray dif...

In this paper, graphene was used as an additive in Cu-based composites employed as electrical contacts. In order to solve the problem of interface bonding between graphene and copper matrix, electroless silver coating on graphene and copper powder were investigated. The Gr/Cu composites were prepared by ball milling and cold compacting sintering pr...

In this paper, the liquid-liquid phase separation (L-LPS) and solidification process of the Al75Bi9Sn16 immiscible alloy were studied with calorimetric and resistivity methods to ascertain the melt superheated treatment process. The impact of melt superheating treatment (MST) on the phase constitution and solidification microstructures were investi...

In this work, a facile synthesis route was applied to fabricate nanoporous copper (NPC). As-sintered AlCu bulk alloys with (or without) NaCl that were fabricated by powder metallurgy were taken as precursors during the preparation of NPC via chemical dealloying. The effects of NaCl in the alloys on precursors and products were investigated. Scannin...

In this paper, copper matrix composites reinforced by nano-carbon materials were fabricated by mechanical alloying followed by cold-pressing. The influences of carbon nano-tubes, graphene, carbon nano-powder, the added content of nano-carbon and milling time on the composite materials were studied with orthogonal experiment method. Ultimately, the...

Liquid structure of alloys has a remarkable influence on the microstructure and mechanical properties of solidifying alloy. Resistivity, as one of the sensitive physical properties to microstructure and macrostructure, plays a very important role in the research of liquid structure and can reflect the electronic transport properties. In this paper,...

The effects of Au addition and annealing on selective intermetallics precipitation and corrosion behaviors of the as-spun Al88-xFe5Y7Aux (x = 0, 0.5 and 1) alloys have been investigated. When Au content x = 0, the alloy has more preferentially precipitated AlY phase, the larger ΔE (= Ep-Eprot, Ep and Eprot are piting and protective potentials) in T...

To improve the mechanical properties of AZ91 alloy, the effects of Te addition on the as-cast microstructure and mechanical properties of AZ91 magnesium alloy were investigated by means of optical microscope (OM), scanning electronic microscope (SEM), energy dispersive spectroscopy (EDS), x-ray diffraction (XRD) and tensile testing machine. The res...

In this paper, the impact of cooling rate on solidification microstructures of Al75Bi9Sn16 alloy was studied for obtaining [Formula presented] core-shell organizations by SEM under normal casting conditions. The results show that the core-shell structure is composed of [Formula presented] core and Al-rich shell and outermost thin layer of [Formula...

In this article, the effects of lanthanum oxide (La2O3) on the microstructure and mechanical properties of H62 brass were investigated by using the universal testing machine, Brinell hardness tester, optical microscope, and scanning electron microscope (SEM). Immersion corrosion and electrochemical measurements were carried out to identify the infl...

The effect of the parameters of thermal-rate treatment of melt on the iron-containing phases in alloy Al – 15% Si – 2.7% Fe is considered. The structure and mechanical properties of the alloy are determined after a thermal-rate treatment conducted at different temperatures of the melt, different pouring temperatures, and different holds at the pour...

Anew method, which is called the resistivity method, is applied in this paper to explore the optimum sintering parameters of powder metallurgy (PM) since general methods are always labor-intensive and time-consuming. This method can probe the resistivity of the powder metallurgy samples in real-time during the sintering process, to quickly estimate...

In this paper, the effects of composition on the mutual exchange of core-shell structure in immiscible Al-Bi-Sn alloys have been studied. The morphology can be classified into three types, Al85Bi6Sn9 and Al75Bi9Sn16 formed a perfect core-type structure, in which the shell is an Al-rich phase and the core is a Sn/Bi-rich phase; Al60Bi14.4Sn25.6 form...

In this article, the temperature dependence of electrical resistivity (ρ-T) of Bi20Sb80 alloy was investigated by DC four-probe method. The results showed that there were two kinds of liquid–liquid structure transition (L-LST) in liquid Bi20Sb80 alloy, one was irreversible at high temperature above the liquids (815–1069°C) and the other was reversi...

With the extensive study of dealloying, copper oxides have been shown to be important members and exhibit huge potential in catalysis, energy transformation and storage fields. In this work, nanostructured copper/copper oxide hybrids were prepared through dealloying the sintered Al85Cu15 alloy and molecular dynamics (MD) simulations as well as calc...

In this paper, the liquid-phase separation of ternary immiscible Al45Bi19.8Sn35.2 and Al60Bi14.4Sn25.6 melts was studied with resistivity and thermal analysis methods at different temperature. The resistivity–temperature curves appear abrupt and anomalously change with rising temperature, corresponding to the anomalous and low peak of melting proce...

In this paper, the liquid-phase separation of ternary immiscible Al–Bi–Sn melts was studied with resistivity and thermal analysis methods at different temperatures. The resistivity–temperature curves appear anomalous and abrupt change as rising temperature, corresponding to the distinctive and low peak of melting process in the differential scannin...

In this paper, the effect of the liquid–liquid structure transition (L-LST) on the solidification behaviors and morphologies of Sn57Bi43 alloy was further studied. The liquid structure of Sn57Bi43 was studied with resistivity, thermal analysis and viscosity method. The obvious turning point is observed on resistivity–temperature, DSC and viscosity–...

CO2 hydrogenation to methanol was investigated over Pd/ZnO/Al2O3, focusing on the influence of the preparation method, reduction temperature and Pd loading on the catalytic performance. The structure of each catalyst were thoroughly examined using various techniques. The results indicated that the methanol selectivity depended on the content of PdZ...

Based on the available structural models and theories of electrical resistivity (ER) of liquid alloys, the structure and the liquid–solid correlation of Al (100-x) Mgx (x = 0, 10, 20, 30, 40, 50) alloys have been qualitatively studied by measuring the ER during the heating/cooling process using the direct-current (DC) four-probe method, as well as...

AlPd alloy slices with a thickness of 0.5 mm were taken as precursors during the fabrication of nanoporous palladium (np-Pd) using chemical dealloying in NaOH solution or electrochemical dealloying in NaCl solution. Scanning electron microscope photos and x-ray diffraction patterns demonstrate a full dealloying of Al out of the precursors and the f...

In this study, nano-sized WO3 powder was dispersed into Co4Sb1.7Te0.3 thermoelectric matrix by ball milling and hot-press sintering technology. The results of scanning electron microscopy (SEM) showed that the WO3 phase distributed uniformly in the form of inclusions on the matrix. High-resolution transmission electron microscopy (HRTEM) presented...

In this article, a novel Al-6Y-2P master alloy with cubic YP particles was successfully synthesized and its complex modification performance on Al-18Si alloy has also been investigated. With the doping of La and Ce, (YxLa1-x)P and (YxCe1-x)P particles still exhibit cubic morphologies in three dimensional spaces (3-D space). The excellent complex mo...

In this paper, Cu–Y composite materials containing different content of Y were prepared with optimized hot-press and cold-press forming process based on L9 (34) orthogonal experiment and their physicochemical and mechanical properties including relative density, conductivity, oxidation resistance and hardness were been tested. The results indicate...

TiO2 modified Al2O3 binary oxide was prepared by a wet-impregnation method and used as the support for ruthenium catalyst. The catalytic performance of Ru/TiO2-Al2O3 catalyst in CO2 methanation reaction was investigated. Compared with Ru/Al2O3 catalyst, the Ru/TiO2-Al2O3 catalytic system exhibited a much higher activity in CO2 methanation reaction....

In this paper, the effects of melt thermal-rate treatment (MTRT) and modification of Y on the microstructure and mechanical properties of Zn-27Al alloy are discussed. The experimental results suggest that the microstructure can be refined and the mechanical properties can be improved with the MTRT technique. The effect of grain refinement achieves...

In this paper, WC-Al composite coatings of AZ91 alloy prepared by mechanical alloying have been investigated in detail. It was found that the premixing process of composite powders has no significant effect in promoting the formation of uniform coating of WC-Al powders. Under the optimised conditions, i.e. The composition of composite powders of (1...

The structure and physical properties of liquid alloy have significant influence on the performances and microstructure of solidified alloys. In addition, the resistivity and viscosity successively reflect the transport properties of atoms and electrons and are sensitive to the micro/macrostructure of liquid alloy. Furthermore, the monotectic alloy...

Metal matrix composites reinforced by graphene particles exhibit physical and mechanical property and are developed and qualified for use in aerospace structure, bioengineering, energy storage material and photoelectric device. In the present paper, graphene was fabricated by modify Hummers method, and then was surface modified by chemical plating...

In this study, nano-sized WO3 powder was dispersed into Co4Sb11.7Te0.3 thermoelectric matrix by ball milling and hot-press sintering technology. The results of scanning electron microscopy (SEM) showed that the WO3 phase distributed uniformly in the form of inclusions on the matrix. High-resolution transmission electron microscopy (HRTEM) presented...

Although the effect of overheating treatment on solidification is due to the liquid structure state, its nature and rule are still unclear. In this article, the effect of melt overheating on the melt structure transition and solidified structures of Al100−x Lax alloys (x = 2, 3, 5) was mainly studied with resistivity and rapid solidification method...

This article will discuss the influence of the rare earth Y on the microstructure and mechanical properties of Zn-Al alloys (ZA27, ZA35, and ZA40), and it will provide reference to rare-earth microalloying through the cast ingot metallurgy process. The results also suggest that the microstructure can be refined and mechanical properties can be impr...

This paper systematically presents a simple and efficient programming methods, using Excel VBA programming, conducted coding, debugging and correction work. Using the data processing method, the automation of the resistivity data processing, including import, parse, filtering, synthesis, smooth, storage, and the cyclic voltammetry data grouping wer...

We present a new Al-Cu-Mn system to fabricate nanoporous copper ribbons by dealloying. The microstructures of the nanoporous copper ribbons are characterized using X-ray diffraction, scanning electron microscopy and energy dispersive X-ray analysis. The results show that the compositions of the melt-spun Al-Cu-Mn alloys have an important effect on...

This article reports the effect of MnCO3 addition on the grain refinement efficiency of AZ91 magnesium alloy. The results indicate that the addition of MnCO3 has excellent grain refining efficiency for AZ91 alloy, which is mainly attributed to the Al4C3 particles formed in the melt, besides Mn is indispensable to grain refinement in Al-bearing magn...

In this article, the effects of Y and combined additions of Y and Al-5Ti-1B on the microstructure and mechanical properties of hypoeutectic Al-Si alloy were studied. The experimental results showed that the addition of Y in hypoeutectic Al-Si alloy can refine the grain and improve the mechanical properties. The optimal addition amount of Y is 0.2 w...

This article reports on an experimental study of the effects of WC on the property of copper based contact materials.The copper based electric contact materials were obtained by powder metallurgy at a high pressure(500 MPa)at a temperature(1073K) for 60 min at 0.1Pa in a furnace.In this paper,the effects of addition of WC on the performance of copp...

Bulk NPC (nanoporous copper) were fabricated by dealloying xAl(100−x)Cu (x = 60, 70 at.%) alloy slices in NaOH solutions (10, 20 and 30 wt.%) under free corrosion conditions. The results show that Al–Cu alloy slices can be completely dealloyed. The synergetic dealloying of Al2Cu and AlCu results in the formation of uniform NPC with small-sized chan...

The present invention develops a method for preparing the corrosion-resistant brass. The brass has 55~74 wt.% Cu, 0.2~1.5 wt.% La2O3, the impurities less than 0.5 wt.% and balanced Zn. The addition of La2O3 can purify melt, refine the microstructure and improve the mechanic performances and corrosion resistance of Cu–Zn brass. The modified alloys c...

A series of modified Ni–Zn bimetallic catalysts were prepared by depositing different kinds of 4 wt% metals (Ir, Pt, Au, Cu, Ag) on the Ni–Zn–Al hydrotalcite (NZAH) and tested in the selective hydrogenation of acetylene. The activity was enhanced by 3-fold over the 4 wt% Au/NZAH, meanwhile, the yield of C2H4 was also increased more than 4 times com...

The catalyst of nanoporous copper, covering a Cu2O layer, was synthesized via the combination of dealloying of melt-spun Al75Cu25 (at.%) precursor alloy in acid solution with subsequent surface oxidation in air. The microstructure of the as-prepared catalyst has been characterized by X-ray diffraction and a field-emission scanning electron microsco...

The Ta-doped ZrNiSn half-Heusler alloys, Zr1-xTaxNiSn, were synthesized by arc melting and hot-press sintering. Microstructure of Zr1-xTaxNiSn compounds were analyzed and the thermoelectric (TE) properties of Zr1-xTaxNiSn compounds were measured from room temperature to 823 K. The electrical conductivity increased with increasing Ta content. The Se...

In this study, protective Ti coatings were deposited on the CoSb3 substrate by DC magnetron sputtering to prevent the sublimation of Sb. The microstructure of Ti coating was observed by SEM and AFM. The thermal aging behaviors of coated CoSb3 samples were investigated through accelerated aging at 650 °C for 24 h. The results indicated that Ti coati...

In this paper, Al/WC composite coatings on A356 alloy were prepared by mechanical alloying, and their mechanical properties were characterized. The processing parameters for mechanical milling treatment, such as the premixing process of Al and WC powders, the ball-to-powder weight ratio and the milling duration, have been optimized, and the optimum...

In order to prevent the sublimation of Sb, protective Mo coatings were deposited on the CoSb3 substrate by DC magnetron sputtering. Thermal aging behavior of CoSb3 with Mo coating was investigated by accelerated experiment at 650oC for 24h. The results indicated that Mo coatings exhibit columnar crystal and body-centered cubic structure. It was fou...

Microstructure evolution of the extruded AZ80 magnesium alloy and different precipitation behavior of b-Mg17Al12 phase in different heat treatment conditions were investigated. Solution treatment caused the dissolution of b-Mg17Al12 phase and the grain coarsening. During aging, discontinuous precipitates were preferentially initiated at some of the...

In this paper, effects of melt thermal-rate treatment (MTRT) on Fe-containing phases in hypereutectic Al-Si alloy were investigated. Results show that MTRT can refine microstructures and improve castability, mechanical properties, wear characteristics, and corrosion resistance of Fe-containing Al-Si alloy. When Al-15Si-2.7Fe alloy is treated with M...

The effects of Al-P addition on the microstructure and mechanical properties of as-cast Mg-5%Sn-1.25%Si magnesium alloy were investigated. The results show that the phases of the as-cast alloy are composed of α-Mg, Mg2Sn, Mg2Si, little P, and AlP. The Chinese character shape Mg2Si phase changes into a granular morphology by P addition because AlP c...

The temperature dependence of electrical resistivity of Cu–Sn alloys, along with Cu–Sn–Bi alloys, has been investigated in a wide temperature range using the DC four-probe technique. Evidently abnormal changes are observed on ρ–T curves of these alloys. The result reveals that the irreversible and reversible changes on these ρ–Tcurves indicate the...

The ceria coating was studied as an efficient alternative to the chromate protective coating of aluminum alloys. The environmentally friendly inhibitor of cerium ion was incorporated into the surface coating using Ce(NO3)3 as precursor via a sol–gel route. The coatings were analyzed with FESEM and EDS. The anticorrosion performance evaluation of th...

In this study, hypoeutectic Al-Si casting alloy was investigated to obtain high strength, according to alloying of Cu Mg, refining of Al-5Ti-B master alloy, modifing of Re and T6 heat treatment. The experimental results show that the mechanical properties of the tested alloy reach peak when addition of Al-5Ti-1B alloy is 1.0% after heat treatment,...

A nanoporous (NP) PdCo alloy with uniform structure size and controllable bimetallic ratio was fabricated simply by one-step mild dealloying of a PdCoAl precursor alloy. The as-made alloy consists of a nanoscaled bicontinuous network skeleton with interconnected hollow channels that extend in all three dimensions. With a narrow ligament size distri...

The influence of cooling rate and addition of La and Ce on the formation of nanoporous copper by chemical dealloying of Cu15Al85 alloy was studied. The components and microstructures of nanoporous copper were characterized by utilizing X-ray diffraction, field emission scanning electron microscopy and energy dispersive X-ray analysis. N2 adsorption...

In the present paper, a new melt treatment technique is proposed, and its effects on hypereutectic Al–18Si–1·5Cu–0·6Mg alloy are investigated. Results show that the mechanical properties of Al–18Si–1·5Cu–0·6Mg alloy are improved remarkably, and primary Si and eutectic silicon can be well refined. The average size of primary Si decreases from ∼100 t...

Aluminum Borate Whisker/Aluminum Phosphates composites (ABW/AP) added Si3N4 were prepared with pressure sintering technique. The influence of Si3N4 on the mechanical properties and dielectric properties were investigated. After sintered at 1050°C for 1h, the results showed that the flexural strength of the composites with 5wt% Si3N4 addition reach...

The microstructure, hardness and corrosion resistance of AZ91D alloy were investigated under different solution treatments and artificial aging conditions.When ascast AZ91D alloy was heat treated at 415°C by solution treatmentfor 12 h and artificially aged at 200°C, the volume fraction of precipitates increased with the aging time up to 10 h.When a...

The copper based electric contact materials with multicomponent substance were obtained by powder metallurgy. The hardness and density of the samples increase with adding proper amount of Y2O3. Adding 1.5 wt.% Y2O3 the hardness of the sample reaches the maxim and the density of sample reaches the maximum by adding 2 wt.% Y2O3. In this paper, the ef...

In this study, nano-sized WO3 powder was dispersed into CoSb3 powder by ball milling and CoSb3/WO3 thermoelectric composites were fabricated using hot-pressing sintering. The results showed that the WO3 phase distributed uniformly in the form of clusters and the average size of cluster was lower than 4 μm. As the content of WO3 increased, the elect...

Under the condition of melt thermal-rate treatment (MTRT) and low-temperature pouring (LTP), the tensile properties of Al-15%Si alloy are improved, the average size of primary Si is refined to about 20 μm from about 50 μm, and eutectic silicon can be well modified. The ultimate tensile strength and elongation are 201 MPa and 3.5%, and these values...

The temperature dependence of viscosity of liquid Bi60Ga 40 alloy has been measured using torsional oscillation viscosity measurement. The results show that the change of viscosity with temperature is distinctly discontinuous, which can be divided into three parts: the changes in high temperature region, mid-temperature region, as well as low tempe...

In this article, a novel Al–6Zr–2P master alloy with ZrP particles was successfully synthesized, and the refining performance of this novel master alloy for the primary Si in Cu–50Si alloys was also investigated. By means of the fracture plane observation, it is found that the ZrP phase would precipitate first in the solidification process, and the...

In this study, effects of thermalrate treatment (TRT) technique on microstructure and mechanical properties of hypoeutectic Al–Si alloys with addition of Ti were studied. The superheating temperatures of the melt were ascertained based on the DSC result. The results show that when the alloy castings in sand mold were treated with TRT technique at t...

Al84Ni10La6 alloy ribbons were prepared at different cooling rate and melt superheat temperature by vacuum arc melting and single roller melt-spinning devices. The glass forming ability and properties of Al84Ni10La6 alloy were investigated by X-ray diffraction (XRD), differential scanning calorimetry (DSC), electrochemical potentiodynamic polarizat...

Magnesium alloys are becoming ever more prevalent in automotive and aerospace industries as energy conservation and performance demands increase. However, it is limited on further application in the automotive field for its low strength compared with steel and aluminum alloys. Effects of Si addition on microstructure and mechanical properties of as...

In this paper, the complex modification process of P and Sr for hypereutectic Al–30Si alloys was investigated. After the addition of 2.0% Al–3P and 0.7% Al–10Sr master alloys continuously added during the melt inoculation and solidification process, the primary Si can be significantly refined from more than 200.0 μm decreasing to 32.8 μm with homog...

Monodisperse PS beads were prepared by miroemulsion polymerization method. Styrene monomer (0.99%), potassium persulfate (0.44%), and sodium dodecyl sulfonate (0.27%) was used as precursor, initiator, and surface active agent, respectively, and then used a novel and simple electroless plating method coating nickel on PS beads substrate by pd-free a...

Nanoporous copper (NPC) ribbons were synthesized by free corrosion dealloying in a 6 wt.% HCl solution for different corrosion times with Mn 70Cu30 alloy ribbons prepared by singleroller melt spinning processing equipment for precursor samples. The microstructures and components of NPC were characterized by utilizing FE-SEM and EDS analysis. Additi...

Aluminum borate whisker reinforced aluminum phosphates composites with SiO2 additive were prepared by pressureless sintering. The influence of SiO2 on aluminum borate whisker aluminum phosphates ceramic wave-transparent materials was investigated. It was found that after the sintering at 1050°C for 1 h, the Vickers hardness of the composites with 5...

The p-type Ga-added Bi0.5Sb1.5Te3 thermoelectric thin film was deposited on glass substrates by flash evaporation. All elements distributed homogeneously in the matrix and nano- GaSb phase, which was about 20 nm, was found in the TEM image. Due to the addition of Ga, the flash evaporated Ga0.02Bi0.5Sb1.5Te3 film showed higher Seebeck coefficient an...

In this paper, Zn-6Ti master alloy was produced and characterized by XRD and SEM. It was found that α-Al dendritic grains in Zn-25Al alloy were remarkably refined after the addition of Zn-6Ti master alloy, with the size remarkably reduced and the morphology changed from complex dendrite to rose-like or granular (equiaxed particle) structure. Lower...

In this paper, two types of Zn-Al-Ti-B-C master alloys were produced by a two-step method and were found to have good refinement effect for Zn-50Al alloy. SEM results show that TiC and TiB2 particles act as the nucleating center of α-Al grains in Zn-50Al alloy. The presence of TiAl3-xZnx phase in the matrix of Zn-Al-Ti-B-C master alloy was found to...

The plate-like crystals of BaTiO3 were synthesized in KCl–NaClKCl–BaCl2 molten salt systems at 900–1 100 by a topochemical method. The parameter effects (such as molten salt, synthesis temperature and materials ratio) on the synthesis performance were investigated. The products synthesized were characterized by X-ray diffraction, scanning electron...

Ga-filled and Te-doped CoSb3 skutterudites were synthesized by a melt-quench-anneal-hot-press sintering method, and their thermoelectric properties were investigated from 300 to 800 K. The filling fraction of Ga in doped skutterudite is up to x = 0.2 and the results of XRD and lattice parameter are in agreement with the change of filling fraction....

The skutterudite/electrode thermoelectric joints were fabricated with the insertion of Ti foil by spark plasma sintering. The interfacial microstructure and reliability of joints were studied during thermal duration test. A multilayer structure, which was composed of intermetallic compounds, was observed at the CoSb3/Ti interface after thermal agin...

Chemical membrane coating method was adopted for AZ91 magnesium alloy surface to explore the preparation method for cerium (Ce) conversion membrane, lanthanum (La) conversion membrane and double rare earth conversion membrane. The methods such as Scanning Electron Microscope (SEM), Energy Spectrometer (EDS) and X-ray Crystallography (XRD) were intr...

In this paper, Al-12.6%Si/Al63Cu25Fe12 composites were fabricated by method of casting. The microstructure and chemical composition of Al63Cu25Fe12 quasicrystal alloy and Al-12.6%Si alloy reinforced by the quasicrystal were studied, and the mechanical properties of Al-12.6%Si composite were also measured. The results show that almost single quasicr...

We used Zr 66.7Ni 33.3 binary alloys as base alloys and selected the intermetallic compound TiC as additional particles. The influence of TiC addition on the microstructural evolution induced by mechanical alloying has been investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and di...

A testing device for the resistivity of high-temperature melt was adopted to measure the l resistivity of In–Bi system melts at different temperatures. It can be concluded from the analysis and calculation of the experimental results that the resistivity of InxBi100−x (x = 0–100) melt is in linear relationship with temperature within the experiment...

The use of lubricant is the key of warm compaction technology. Because of admixed different lubricants, the optimal parameters of warm compaction process were also different. This paper investigated the effect of two kind of lubricants (zinc stearate and polystyrene) on the parameters of warm compaction process by compared properties of Cu-based co...

The freezing behaviors of Al nanowires with different section sizes and cooling rates are studied by using the classic molecular dynamics simulation via embedded atom potentials. In order to invesligate the evolution of the local clusters in the transformation of Al nanowires, the pair analysis technique is employed. The simulation results indicate...

Joining of thermoelectric material with electrode is the key technique in the construction of thermoelectric device for the practical application. In this study, a suitable W–Cu alloy electrode was introduced into CoSb3-based element with insertion of Ti layer by means of spark plasma sintering. Finite element analysis showed that the maximum therm...

In this article, the structure of Al-18Si alloy was modified by thermal-rate treatment technique at 930 A degrees C based on the DSC result. The mechanical properties of Al-18Si alloy were improved remarkable by a complex technique with alloying and thermal-rate treatment. A new treating technique named as complex modificating technique was propose...

A testing device for the resistivity of high-temperature melt was adopted to measure the resistivity of In–Bi system melts at different temperatures. The resistivity of InxBi100−x(x=0–100) melt is in linear relationship with temperature, which is within the temperature measuring range. The resistivity of melt lowers with the increase of the In cont...

Cu-38Zn thin film (wt %) was deposited on the unheated microscope glass at the nanometer scale by DC magnetron sputtering. Subsequently, the nanocrystalline films were dealloyed in H2SO4 aqueous solution etching of zinc component, resulting in the formation of nanoscale porous copper film with average porous diameter of approximately 94 nm. The fil...

In this paper, we successfully produced Al-Ti-B-C master alloys through adding mixtures of Ti and B4C powders into Al melt. XRD and SEM examinations suggest that only fine TiB2 and TiC particles are formed in the matrix of Al-Ti-B-C master alloy when the Ti/B4C molar ratio is 3/1, while an additional TiAl3 phase is present when the Ti/B4C molar rat...