Xianshun Wei

Tongji University · Department of Material Science and Engineering

The effects of nanosecond pulsed laser processing (NPLP) on the surface morphology, microstructure, and corrosion resistance properties of Fe-based metallic glass coating were investigated. It was found that after pulsed laser processing, the metallic glass coating retained its amorphous structure; however, cracks were generated on the top of the c...

Dynamic direct current (DC) may cause severe electrochemical corrosion on buried steel pipelines near urban rail transits. In this paper, the corrosion behavior of Q235B steel under dynamic DC interference was carried out in NS4 simulated soil solution (NS4 solution) including potassium chloride (KCl), sodium bicarbonate (NaHCO3), calcium chloride...

In this work, we aimed to evaluate the influence of working pressure on the structure and magnetic properties of the iron film. Iron films were deposited on Si (100) substrates by direct current (DC) magnetron sputtering at different working pressures. The X-ray diffraction (XRD) results indicated that all iron films were polycrystalline BCC struct...

Hybrid reinforced aluminum-based composites with a silicate component with pozzolanic activity and silicon carbide ceramic particles as reinforcement phases can form an iron-poor friction transfer film during the friction process, thereby making the aluminum-based composites exhibit a high friction coefficient and a low wear rate characteristics. T...

In this work, a novel combination treatment was investigated as a means to improve the rotating bending fretting fatigue resistance of GH4169 superalloy at 650 °C. The properties, morphologies and composition were studied for magnetron-sputtered WS2/Ti films on substrates with and without a shot peening pre-treatment. The surface integrity and fret...

The FeCrMoWCBY metallic glass exhibited excellent corrosion resistance in oxygen-saturated lead-bismuth eutectic (LBE) at 500 °C. The corrosion resistance could be enhanced by adding an appropriate amount of W element, while excessive W deteriorated the corrosion resistance of the metallic glass. The surface of the Fe-based metallic glass was compo...

This study investigated the effect of annealing below glass transition temperature (Tg) on the microstructural characteristics, mechanical property, wettability, and electrochemical performance of activated combustion-high velocity air fuel (AC–HVAF)-sprayed Fe–Cr–Mo–W–C–B–Y amorphous coatings (ACs). Results showed that Fe-based ACs with a thicknes...

The objective of the study is to investigate the corresponding microstructure and mechanical properties, especially bending strength, of the hypereutectic Al-Si alloy processed by selective laser melting (SLM). Almost dense Al-22Si-0.2Fe-0.1Cu-Re alloy is fabricated from a novel type of powder materials with optimized processing parameters. Phase a...

A low-cost and Be-free Zr-based amorphous system with excellent thermoplastic formability has been developed by doping a small amount of Y element. Based on the thermodynamic test data, Y addition can increase the supercooled liquid region of Zr-based amorphous alloy when it is less than 2 at.%, leading to a relatively wider temperature range of th...

In this paper, the radio frequency (RF) magnetron sputtering (MS) method was utilized to fabricate multiple sets of the iron film samples under different sputtering powers. With the help of X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM) and vibrating sample magnetometer (VSM), how the sputtering power aff...

A single-layer three-dimensional model was created to simulate multi-channel scanning of AlSi25 powder in selective laser melting (SLM) by the finite element method. Thermal behaviors of laser power and scanning speed in the procedure of SLM AlSi25 powder were studied. With the increase of laser power, the maximum temperature, size and cooling rate...

We investigated wear behavior of ceramic waste SiC particle-reinforced aluminum matrix composites (ASC) to evaluate the effect of hybrid particles on dry sliding. Aluminum alloy and its composites were prepared by powder metallurgy process. Brinell hardness and flexural strength of ASC are improved compared to those of the aluminum base alloy. When...

The thermodynamic and kinetic properties of Cu45.6Zr45.3Al9.1, Cu47.5Zr45.1Al7.4, and Cu47.3Zr45.8Al6.4Sn0.5 bulk metallic glasses are investigated to help understanding the origin of the glass-forming ability in the Cu–Zr–Al(–Sn) glass-forming system. The thermodynamic driving force for crystallization is determined by using specific heat capacity...

Microstructure, mechanical properties, and elevated-temperature (below the glass transition temperature) tribological performance of the activated combustion–high velocity air fuel (AC–HVAF)-sprayed Fe-Cr-Mo-W-C-B-Y amorphous coating (AC) were investigated. In vacuum, the enhanced hardness favored the wear resistance of Fe-based AC as the temperatu...

The appearance of thin film metallic glasses (TFMGs) is gaining increasing interest because of their unique mechanical and anticorrosion properties and potential engineering applications. In this study, Cu-Zr-Al ternary thin film metallic glasses were fabricated by using DC magnetron sputtering equipment with various target powers. The evolution of...

Ti-Mg immiscible alloy thin films were prepared using a multi-arc ion plating technique with various deposition parameters. The surface and cross-section morphologies, crystal structures, and chemical compositions of the Ti-Mg films were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), and transmission electron microscop...

The low temperature viscosities of Cu47.5Zr45.1Al7.4 glass-forming liquid are measured by thermomechanical analysis in three-point beam bending mode. The experimental equilibrium values are fitted with the Vogel-Fulcher-Tammann (VFT) function, and the fragility parameter of the supercooled liquid is determined to be D* = 20.6. Viscosity measurement...

Computational fluid dynamics is used to investigate the in-flight behavior of particles of Fe-based amorphous alloy powder in an activated combustion high-velocity air fuel spray process. The continuity, momentum, energy, and species equations are solved with a renormalization group k–ε turbulence model to predict the flow fields. A one-step chemis...

Ni-based composite coatings with a high content of tungsten carbides (Stelcar 65 composite coatings) were synthesized by plasma transferred arc (PTA) hardfacing. The welding parameters of Stelcar 65 composite coatings were optimized by orthogonal tests. The PTA welding parameters including welding current, powder feed rate and welding speed have si...

The electrochemical behaviour and passive film properties of Fe–Cr–Mo–W–C–B–Y amorphous alloys in acetic acid solution were investigated. The potentiodynamic polarisation and Nyquist curves demonstrated that W addition significantly enhanced the corrosion resistance. Mott–Schottky plots and angle-resolved X-ray photoelectron spectra indicated that...

This study aimed to investigate the electrochemical behavior and passive film properties of Fe-based bulk metallic glass (BMG) formed in Cl⁻-containing acetic acid solutions under high temperature. Electrochemical tests showed that Fe-based BMG exhibited excellent pitting resistance and stable passivation characteristics. However, the uniform corro...

The effects of refractory element W addition on the glass forming ability (GFA) and mechanical properties of Fe47−xCr20Mo10WxC15B6Y2 (x = 0, 2, 4, 6 at. %) alloys were investigated. The supercooled liquid region ΔTx (Tx − Tg) and criterion γ [Tx/(Tg + Tl)] of Fe47−xCr20Mo10WxC15B6Y2 alloys increased to 62 K and 0.390, respectively, when x increased...

Fe-based amorphous coatings prepared by high-velocity air fuel spray process on 304 stainless steel substrates were sealed with aluminum phosphate sealant. The morphology and microstructure of the gas-atomized powders, as-sprayed coating, and sealed coating were characterized by X-ray diffraction and scanning electron microscopy. The corrosion beha...

The wear behavior of two coatings (Fe49.7Cr18Mn1.9Mo7.4W1.6B15.2C3.8Si2.4 and Fe40Cr23Mo14C15B6Y2) sprayed by high-velocity air fuel technology was investigated through nanoscratch tests under ramping loads. Compared with the substrate, the Fe-based amorphous coatings exhibit lower penetration depth, higher elastic recovery, and lower wear volume,...

High pressure torsion was conducted to obtain nano-sized β grains in a metastable Ti-5553 alloy. Much finer grains of <50 nm were achieved, compared to >100 nm in a stable Ti-20 wt.% Mo alloy. The more effective grain refinement was attributed to stress induced martensitic transformation in the former, leading to the formation of thin α″ plates whi...

A Ti-5553 metastable β alloy was subjected to high pressure torsion (HPT) to obtain a nano β grain structure. The β grains were dramatically refined from an initial size of ∼1 mm to Document Type: Research Article DOI: http://dx.doi.org/10.1088/1757-899X/89/1/012055 Publication date: January 1, 2015 $(document).ready(function() { var shortdescripti...

Nanocrystalline Ti and Ti–20 at.% Mg produced by mechanical milling were characterized using nanobeam diffraction. Metastable ω (hexagonal) and γ (orthorhombic) phases were observed in the pure Ti, while γ, a new orthorhombic ε phase and a face-centred cubic (fcc) phase were identified in the Ti–Mg. γ, found so far only at high pressures, was produ...

A powder metallurgy route based on high-energy ball milling, powder consolidation by hot extrusion and cold rolling was used to produce Al composite wires reinforced with Al2O3 nanoparticles. The process was capable of preparing fully dense nanocomposites characterized by well dispersed nanoparticles in a ultrafine grained matrix. Ball milling led...

Al-based amorphous matrix composites enhanced with Ti-based glassy particles are fabricated using a cold hydro-mechanical pressing (CHMP) technique. The compacted glassy/crystalline microstructure and strong interface bonding caused by severe deformed densification of Al-based powders are responsible for high fracture strength and improved plastici...

Commercial purity Al and A1 based composite wires reinforced with alumina nanoparticles were produced via powder metallurgy route. Powder of Al and Al with 2 wt.% of nano-Al2O3 particles were processed by high-energy ball milling. The powders were consolidated by hot extrusion into billets and then rolled to wires down to a square section of 1 mm2....

Fully dense (pore-free) nanostructured TiN-reinforced titanium matrix composites have been synthesized by consolidating ball-milled mixtures of pure titanium and TiN particles using back-pressure assisted equal channel angular pressing (ECAP). Prior to consolidation, ball milling was conducted on powder mixtures of titanium and TiN to achieve break...

Commercial purity Al and Al based composite wires reinforced with alumina nanoparticles were produced via powder metallurgy route. Powder of Al and Al with 2 wt.% of nano-Al2O3 particles were processed by high-energy ball milling. The powders were consolidated by hot extrusion into billets and then rolled to wires down to a square section of 1 mm2....

Here, the authors focus on the relationships among the electrical conductivity, thermal conductivity, and glass-forming ability (GFA) of an FeCoCrMoCBY alloy system. It is found that the GFA is closely related to the transport properties of Fe-based BMGs. Among the alloy system studied, the alloy containing 7% Co (Co7) shows the lowest electrical c...

Preliminary results of cold compaction of rapidly hardened spherical granules of a Ti – Al – Cr – Mn alloy by the method of cold upsetting under conditions of uniform hydrostatic compression are presented. The compacted powder test piece exhibits cold strain with traces of plastic slip in the process of the upsetting. The cylindrical plunger from s...

Gas atomized Al85Ni10CeP5 partially amorphous alloy powders were successfully consolidated into bulk alloy specimens with high relative density at room temperature by cold hydromechanical pressing. The consolidated specimens have a high fracture strength of up to 1.1 GPa. Two densification mechanisms are proposed to explain the consolidation proces...

We invented a instrument to fabricate thin-walled long metallic glassy tube

Gas atomized pure Al powders were successfully consolidated into full density at room temperature by newly developed cold hydro-mechanical pressing (CHMP). The effects of the configuration of pressures on the relative density and microstructure of consolidated specimens were investigated. The full density consolidation of metal powders at room temp...

The mechanical property of a new bulk metallic glass Zr50.7Cu28Ni9Al12.3, which owns 5% room-temperature plasticity, is investigated at low temperatures 193K and 123K. It is indicated that the yield strength and the plasticity significantly increase by 12.8% and 50% respectively as testing temperature is lowered from 298K (at room temperature) to 1...

The glass forming ability (GFA) of a newly developed Zr 50.7 Cu 28 Ni 9 Al 12.3 alloy can be improved by minor addition of Gd element, for example, the amorphous alloy Zr 50.7 Cu 28 Ni 9 Al 12.3 has a critical diameter of 14 mm, but the alloy added by 1%Gd (atomic fraction), (Zr 50.7 Cu 28 Ni 9 Al 12.3) 99 Gd 1 , has 16 mm critical diameter. Howeve...

Zr–Cu–Ni–Al quaternary amorphous alloy compositions with varying glass-forming ability are developed by an efficient method of proportional mixing of binary eutectics. The critical diameter of the glassy sample is improved from 6 mm for Zr53Cu18.7Ni12Al16.3 to 14 mm for Zr50.7Cu28Ni9Al12.3 by straightforwardly adjusting the eutectic unit’s coeffici...

A Ti ₄₀ Zr ₂₅ Cu ₁₂ Ni ₃ Be ₂₀ bulk metallic glass (BMG) was welded to a crystalline aluminum by the parallel plate explosive welding method. Experimental evidence and numerical simulation show that atomic-scale bonding between the BMG and the crystalline aluminum can be achieved, and the weldm...