Tokuteru Uesugi's research while affiliated with Osaka Prefecture University and other places
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Publications (147)
Martensite phase plays a crucial role in the shape memory effect and superelasticity. In this study, a new dislocation dissociation was found in the α″ martensite phase of a Ti-based biomedical shape memory alloy by systematic transmission electron microscopy analysis and first-principles calculations. The slip direction of dislocation was along <1...
A solid solubility prediction system using Hume-Rothery parameters and first-principles calculation to obtain explanatory variables was devised, and the resulting coefficients of determination, R², were compared. When we used the Hume-Rothery parameter, R² was 0.715, and when we used the first-principles calculation results, R² was 0.900, indicatin...
An Al–7.3 mass%Mg-based alloy with high strength and good hot rollability was developed by addition of grain boundary strengthening element. We predicted that Fe is the most effective element for grain boundary strengthening at 773 K from first-principles calculations. Then, an Al–7.3%Mg–62 ppmFe alloy and Al–7.3%Mg–124 ppmFe alloy were developed....
The thermal stability of electrodeposited Ni–W alloys has been identified to be due to W segregation. Although a kinetic contribution has been recently proposed, namely, the formation of W-oxides at grain boundaries (GBs) by annealing, the formation mechanism is unclear. In this study, we annealed electrodeposited Ni–W alloys up to 600 °C; then, we...
Effects of Zr addition on the intergranular fracture of Al–Cu–Mg and Al–Zn–Mg–Cu alloys were investigated. The alloys were Al–4.6 mass%Cu–1.5 mass%Mg (−0.17 mass%Zr) and Al–7.5 mass%Zn–2.9 mass%Mg–2.0 mass%Cu (−0.2 mass% Zr). All alloys were synthesized using high-purity aluminum with more than 99.999 mass%. The grain size and hardness of each allo...
Electrodeposited Ni and its alloys typically contain S due to crucial reagents used in the electrodeposition processes. The relative S concentration at the grain boundary (GB) increases when grain sizes are increased by thermal treatments, resulting in a transition from ductile to brittle failure. In this study, we theoretically explored effective...
A key property for the design of new shape memory alloys is their working temperature range that depends on their transformation temperature T 0 . In previous works, T 0 was predicted using a simple linear regression with respect to the energy difference between the parent and the martensitic phases, ΔEp-m. In this paper, we developed an accurate m...
An Al-8Mg-based alloy with high strength and high ductility was developed by adding a grain boundary strengthening element. Zr was predicted to be the most effective element for grain boundary strengthening at 298 K from first-principles calculations. Then, an Al-8Mg-0.2Zr alloy was developed. Grain boundary analysis by high-angle annular dark-fiel...
Al and Al alloys electrodeposited from a dimethylsulfone (DMSO 2 ) bath are typically contaminated with S and Cl. Electrodeposited Al and Al alloys suffer from limited ductility since undesired impurities decrease plastic deformability. Herein, we report an electrodeposition process involving the use of a DMSO 2 bath that realizes an Al product wit...
Conventionally, the W content of a ductile electrodeposited nanocrystalline Ni-W alloy was only up to 2%. In this study, we investigated the relationship between bath compositions and W content of the electrodeposit. The W content could be increased as high as 3.8% by adjusting the bath composition, while the tensile elongation was maintained great...
A key property for the design of new shape memory alloys is their working temperature range that depends on their transformation temperature T0. In previous works, T0 was predicted using a simple linear regression with respect to the energy difference between the parent and the martensitic phases, ΔEp-m. In this paper, we developed an accurate meth...
High productivity and bath stability of electrodeposition for Al and its alloys from a dimethylsulfone (DMSO2)-aluminum chloride bath are highly desirable characteristics for a wide range of critical applications. However, a long-standing problem for such electrodeposits is S and Cl contamination, which results in limited ductility. In this study,...
Contamination with sulfur causes deterioration of the mechanical properties of electrodeposited nanocrystalline iron (Fe) and its alloys. However, it is difficult to avoid this contamination for electrodeposition from a sulfate bath. In this study, we explored the processing parameters required to produce thick plates of electrodeposited Fe from a...
We clarify elevated temperature strength and deformation mechanisms of the eutectic Al-Si alloy (AC8A) matrix composites reinforced by 15 vol% and 20 vol% FeCrSif and then construct the constitutive equation of the elevated temperature deformation. Compression test was carried out by strain rate rapid change method on the materials under the condit...
We electrodeposited bulk nanocrystalline Fe–Ni alloys with a tensile ductility of 12%–24%. We explored the intrinsic ductility of these alloys, taking into consideration the relationship between the ductility and the orientation index and contents of the grain boundary embrittlement element. Applying multiple regression analysis to our findings and...
Nanocrystalline FeMn alloys for molds with high strength, high thermal stability, and relatively low cost were prepared by electrodeposition. We used electrolytes that primarily consisted of iron sulfate and manganese sulfate combined with manganese chloride. Since electrodeposited FeMn alloys tend to include many defects that greatly reduce their...
The best electrodeposition conditions for fabricating artifact–free and ductile bulk nanocrystalline (nc) Ni–Fe alloys were investigated by evaluating the orientation indices of thin–film samples. Bulk nc Ni–Fe alloys electrodeposited under optimum conditions exhibited a high ultimate tensile strength of 1.9 GPa and a high tensile ductility of 9.1–...
The best electrodeposition conditions for fabricating artifactfree and ductile bulk nanocrystalline (nc) NiFe alloys were investigated by evaluating the orientation indices of thinfilm samples. Bulk nc NiFe alloys electrodeposited under optimum conditions exhibited a high ultimate tensile strength of 1.9 GPa and a high tensile ductility of 9.112.2%...
Effects of third alloying elements on the transformation strains and phase stabilities of Ti-Nb based alloys at 0 K were investigated using the first-principles calculations. In binary Ti-Nb alloys, the transformation strains and the body-centered cubic high-temperature beta (β) phase stabilities decrease with increasing Nb concentration. In Ti-12....
Improvements in the high-temperature strength are desired for the ferritic Ni-Cr-Mo steels used for the brake discs in mechanical brake systems on railway. The objective of this paper is to construct a constitutive equation for the high-temperature deformation in Ni-Cr-Mo steels containing small amounts of V. The examined steels were obtained by va...
Effect of metal inert gas (MIG) welding parameters on tensile strength of weld joints in a Mg–6%Al–1%Zn–2%Ca (AZX612) flame retardant magnesium alloy was examined. Proper welding conditions were found by examining welding current from 70 to 140 A and welding speed from 45 to 70 cm/min. The ultimate tensile strength of weld beads was more than 70% o...
The effects of transition elements X (X = V, Cr, Fe, Nb, Mo, Ta and W) on the phase stability of β-Ti alloys were studied from first-principles calculations. The enthalpy curves for the alpha-and beta-phases of Ti-X alloys were described as a function of the X concentration by using the calculated solution enthalpies and sub-regular solution model....
A method for reducing the sulfur content of electrodeposited bulk nanocrystalline Fe–Ni alloys was developed to improve the tensile ductility of the materials and prevent thermal embrittlement caused by the grain boundary segregation of sulfur. Bulk nanocrystalline Fe–Ni alloys were prepared using electrolytes that primarily consisted of iron sulfa...
The effect of alloying on the formation enthalpy of TiCu intermetallics was investigated via first-principles calculations to propose a new design method for Ti–Cu-system metallic glasses. The calculation results showed good agreement with the reported experimental results that Ni, Pd, Sn and Zr improve this system’s glass-forming ability. Accordin...
In this work, the effects of solute Fe, Zn, and Mg on the suppression of recrystallization in Al are studied. The materials are Al-22.2 atomic parts per million (at ppm) Fe, Al-53.6 at ppm Fe, Al-0.1 at% Mg, Al-1.1 at% Mg, Al-0.1 at% Zn, and Al-3.0 at% Zn. All were synthesized using high-purity starting materials. The amount of impurities other tha...
The effect of alloying element X (X = Al, Sn, Zr, Ta) on the transformation strains and phase stabilities of Ti-12.5 at%Nb and Ti-25 at%Nb alloys was investigated. The principle strain, η2, was calculated as a function of the X concentration. The value of η2 of Ti-12.5 at%Nb-6.25 at%Zr was larger than that of Ti-12.5 at%Nb-6.25 at%Ta. This is consi...
Friction stir processing (FSP) is one of the severe plastic deformation (SPD) processes. It has been reported that SPD-processed Al with various purities attained a minimum grain size when Zener-Hollomon parameter is larger than 1016 s-1. The minimum grain size is different by purity level and alloying elements. We investigated the influence of Fe...
Texture change during superplastic deformation was examined and compared in two magnesium alloys with different chemical composition. These alloys were extruded to refine the microstructure. The pre-existing basal texture of both alloys became slightly more random within the bulk probably owing to grain boundary sliding and the accompanying grain r...
Bulk nanocrystalline Fe-Ni alloys with Ni content of 40-55 at.%, grain size of 12-15 nm, and hardness of 3.9-4.6 were prepared by an electrodeposition. The decrease in the hardness values as grain size decreased was discussed in terms of grain refinement effect, solid solution strengthening, and grain boundary relaxation strengthening. It was found...
Recent numerous studies demonstrated the advantages of producing bulk metals with submicrometer grain sizes which provide the opportunity to demonstrate improved mechanical characteristics including superplastic properties. Besides the effort, although the impurity may cause low ductility due to grain boundary segregation, there are limited studies...
Parameters for evaluating the glass-forming ability (GFA) in Ti–Cu system metallic glasses were considered by investigating the effect of additional elements (Fe, Co, Ni, Si, Zr, Cr) on structural changes and onset temperatures associated with each exothermic peak on heating. The differential scanning calorimetry curves of Ti–Cu system metallic gla...
The mechanisms of creep and superplasticity occurring in conventional coarse-grained materials are now understood well. However, recent study advances in the production of bulk metals with submicrometer grain sizes which provide the opportunity to demonstrate improved mechanical properties. Thermo-mechanical processing is used in conventional indus...
In this study, cost reduction of manufacturing R (Nd, Pr, and Dy) –T (Fe, Co)-B permanent magnets was investigated. An efficient direct melting recycle of R-T-B magnet scraps and multiple methods for saving Dy were focused. In the former, Decarburization and deoxidation of R-T-B magnet scraps were developed as a pre-treatment technique for conventi...
A strategy for producing highly ductile electrodeposited bulk nanocrystalline metals with face-centered cubic structures was developed in a Ni–W alloy model system. Bulk nanocrystalline Ni–W alloys with similar grain size (20–30 nm), and varying crystallographic orientations were produced. The electrodeposited alloys showed tensile elongation rangi...
New Ti-based metallic glasses were designed and fabricated in the ternary component alloy system Ti–Zr–Co. The constituent elements of the alloy system were selected based on three empirical rules proposed by Inoue, Turnbull, Senkov and Miracle, and by a new parameter called the effective atomic radius, which is based on the first-principles calcul...
A method for enhancement of the mechanical properties of electrodeposited bulk nanocrystalline Fe-Ni alloys was explored. Bulk nanocrystalline Fe-Ni alloys were prepared using electrolytes that primarily consisted of iron sulfate and nickel sulfamate with propionic acid. Varying the concentration of propionic acid in the deposition bath produced no...
In order to develop a high strength and heat-resistant magnesium alloy, we focused on controlling microstructure of Mg96Zn2Y2 (at %) casting alloy by the addition of a 4th element. Initially, we investigated the effects of zirconium addition and cooling rate for grain refinement on microstructure and mechanical properties. Consequently, Mg95.8Zn2Y2...
New Ti-based ternary metallic glasses were designed and fabricated. A new parameter called effective atomic radius in the Ti solid solution from ab-initio calculation was used to design of the Ti-based metallic glasses. From the effective atomic radius, Ti-Zr-Mn, Ti-Zr-Fe and Ti-Zr-Co systems can be considered as a new Ti-based ternary metallic gla...
Recent experimental data have revealed that a small amount of impurity can significantly influence the superplastic behavior in Zn-Al eutectoid superplastic alloy. However, the effect of Si content on the superplastic behavior in Zn-Al alloy has not been reported. In this study, the superplastic behavior at a room temperature of two grades of the Z...
Electrodeposition for Al from a dimethylsulfone (DMSO2) bath was consecutively performed, applying two types of current waveforms such as direct current and pulsed current, to investigate the effect of a current type on the preparatory electrodeposition (pre-electrodeposition) process. Electrodeposited Al from a DMSO2 bath has a nanograined structu...
Creep tests of ultra-high-purity (99.999%) Al and Al-22.2, 53.6, 101 at.ppm Fe solid solution alloys were conducted at 773 K in the stress range of 2-6 MPa in order to investigate effect of solute Fe on high temperature deformation of Al. Creep resistance was enhanced by addition of Fe in solid solution. The stress exponents of the samples exhibite...
Effect of typical impurities such as Fe, S, and Cl on mechanical properties of Al electrodeposited from a dimethylsulfone bath (DMSO2 bath) were studied. Electrodeposition from a DMSO2 bath was conducted to produce the bulk specimens with 0.08-0.24 at.% Fe, 0.47-0.84 at.% S, and 0.59-1.06 at.% Cl, varying the purity of aluminum chloride and current...
A relationship between yield stress and grain size was examined in FSP-ed and annealed 5N-Al (99.9996% purity) in order to reveal the relationship on materials with equal chemical composition, because the large positive deviations of yield stress from the Hall–Petch relation obtained by plots with coarse grain size were reported in the fine grain s...
The influence of filler rod composition on the strength of Tungsten Inert Gas (TIG) welded magnesium alloy joint was investigated. Samples were rolled AZ31 (Mg-3Al-1Zn) magnesium alloy as base metal and drawn AZ31, AZ61 and AZ91 magnesium alloys as filler rod. The results show that all fracture points were fusion zone (FZ), and each joint efficienc...
The tensile behavior of electrodeposited bulk nanocrystalline Fe–Ni alloys with a grain size of approximately 15 nm was investigated. Electrodeposited alloys with a nickel content of 43–56 wt% have a single-phase face-centered cubic structure. These alloys exhibited a good combination of tensile strength and ductility in tensile tests at room tempe...
Enthalpies of solutions and misfit strains for the Al–X (X = H, B, C, N, and O) binary alloys were determined by first-principles calculations to estimate the strengthening of solid solutions caused by interstitial atoms. The results indicate that interstitial solute atoms produced large misfit strains. Electrodeposited Al containing 0.12–1.32 at.%...
Al was electrodeposited from a dimethylsulfone (DMSO2) bath using a new pre-electrodeposition process to investigate the effect of sulfur and chlorine on the tensile ductility. Al electrodeposited from a DMSO2 bath contains sulfur and chlorine, which are impurities are incorporated into the electrodeposits as sulfide and chloride, respectively. By...
Bulk nanocrystalline Ni-W alloys were electrodeposited from a sulfamate bath with 0, 0.1, 1.0, and 5.0 g/L saccharin sodium to improve the tensile ductility. Electrodeposited Ni-W alloys have excellent wear resistance, good corrosion resistance, and high thermal stability. They have attracted much attention with respect to their potential applicati...
To gain insight into accommodation mechanisms for local stress concentrations produced by grain boundary sliding (GBS), we systematically examined texture evolution within a superplastic magnesium alloy undergoing deformation at a relatively low deformation temperature (at which basal slip is known to be the preferred slip system in magnesium). Alt...
Effect of orientation on tensile ductility of electrodeposited bulk nanocrystalline Ni–W alloys was studied. Bulk nanocrystalline Ni–W alloys with different textures were prepared by electrodeposition, varying the amount of saccharin sodium and the bath temperature. An elongation of 0–13.4% was obtained in a tensile test. Although there was no rela...
Solid solution strengthening by carbon and sulfur in bulk nanocrystalline Ni was studied by electrodeposition and first-principles calculations. Bulk nanocrystalline Ni with a carbon content of 30–1600 ppm and a sulfur content of 140–1200 ppm was prepared using a sulfamate bath with different complexing agents and gloss agents. The hardness values...
The effects of adding small amounts of Zn on the microstructural evolution of low-Ag Sn–Ag–Cu solders and thermal shock behavior during thermal cycling between −40 and 125°C were investigated. Observation of the visual appearance of the solder joints revealed that the probability of solder deformation and crack initiation in the solder fillets afte...
Ni–W alloys are promising materials for high temperature and structural applications. However, they show no plastic deformation under tensile tests. We electrodeposited bulk nanocrystalline Ni–W alloys from sulfamate baths that contained different additives, such as saccharin sodium, 2-butyne-1,4-diol, and sodium allylsulfonate, to improve the tens...
In order to develop large-scale (100 mm in diameter) Mg-Zn-Y alloys with high strength beyond that of 4032-T6 alloy, we considered a novel casting process to produce large ingots with homogeneous microstructure, and investigated the mechanical properties of the extruded alloys. First, ingots (335 mm in diameter and 850 mm in height) were produced b...
The extruded Mg-Zn-Y alloy with long-period stacking ordered (LPSO) structures is known to display increased strength ai room temperature as well as at elevated temperature. In order to achieve these attractive properties in cast component, we ft cused on controlling microstructure of Mg 96Zn2Y2 (at%) cast alloy by the addition of Ag. Mg96Zn2Y2 cas...
The effects of solute X (Mo, Nb, V and W) on the phase stability of beta-Ti alloys were studied from first-principles calculations. The first-principles calculations yielded solution enthalpies for hexagonal close-packed (hcp)-Ti35X1 and hcp-X35Ti1 and body-centered cubic (bcc)-Ti26X1 and bcc-X26Ti1 solid solution alloys. The enthalpy curves for th...
Changes in the lattice constants of 55 Al-based solid solutions, as well as local lattice distortions induced by solute atoms, were studied on the basis of first-principles calculations using 3.70, 3.13, 1.56, and 0.93 at.% alloys. The first nearest-neighbor interatomic distances between the solute and the solvent Al atoms were relatively constant...
Bulk nanocrystalline Ni-W alloys were electrodeposited from a sulfamate bath with 0, 0.1, 1.0, and 5.0 g/L saccharin sodium to improve the tensile ductility. Electrodeposited Ni-W alloys have excellent wear resistance, good corrosion resistance, and high thermal stability. They have attracted much attention with respect to their potential applicati...
A textured Mg–9Al–1Zn alloy rod exhibited highly isotropic flow along the longitudinal and transverse directions during superplastic deformation, indicating that crystallographic orientation had a negligible effect on flow stress. Although there was an overall weakening of the initial basal texture during deformation due to grain boundary sliding,...
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We studied the relationship between the grain boundary energy and grain boundary excess free volume at the tilt grain boundaries in aluminum by applying the first-principles calculations. The grain boundary energy increased linearly as the grain boundary excess free volume increased. The value of the proportionality constant between the grain bo...
The grain boundary segregation energies of Mg, Na, Ca, K and Sr at a symmetric tilt Σ 11(1\bar{1}3)[110] grain boundary were investigated in aluminum using the first-principles calculation. The relationship between the grain boundary segregation energies and the volume size factors were examined to understand the role of elastic strain energy in th...
In this study, calcium, Ca-, and strontium, Sr-added AZ91 magnesium alloys, which were composed of magnesium, Mg–9 wt.% aluminum, Al–0.8 wt.% zinc, Zn–x wt.% Ca–y wt.% Sr, were formulated and designated as AZXJ91xy alloys. The optimum composition of die-cast AZXJ alloys has been studied by micro-structural analysis and through the application of th...
Bulk nanocrystalline (nc) Al was electrodeposited from a mixture of dimethylsulfone-based electrolytes (DMSO2 bath). The DMSO2 bath demonstrates characteristics suitable for the fabrication of bulk nc Al, such as high current efficiency, good thermal stability, and low toxicity. The bulk nc Al having a thickness of 250 μm was electrodeposited from...
The effects of adding small amounts of Zn and conducting an aging treatment at elevated temperatures on the microstructure and tensile properties of low-Ag Sn–Ag–Cu alloys were investigated. The addition of Zn to Sn–Ag–Cu alloys inhibited the growth of intermetallic compounds. As the amount of Zn increased, the flow stress increased both before and...
The effect of alloying elements on the threshold stress for superplasticity was investigated using two binary solid solutions, namely, Mg–Al and Mg–Y alloys. Both alloys exhibited superplasticity, and in spite of the absence of fine particles showed threshold-stress-like behavior. Different origins were suggested for the threshold-stress-like behav...
In this study, the electrodeposition process for bulk nanocrystalline (nc) Ni–W was improved in order to enhance the tensile ductility of bulk nc Ni–W with improvements in residual stress and current efficiency, which are one of the major challenges faced in traditional electrodeposition processes for Ni–W, were realized. Nickel sulfamate electroly...
Grain boundary relaxation at elevated temperatures in fine-grained pure magnesium and Mg–Al solid solutions was investigated by measuring damping capacity at low frequencies. A sharp increase in damping capacity caused by grain boundary relaxation was observed at above a certain temperature. The onset temperature depended on aluminum content; the o...
The dynamic friction coefficients of the commercial aluminum alloys (A2014, A2024 and A6061) and a superplastic IN9021 alloy were measured by ring-compression tests in a temperature range from 573 to 753K and a stain rate range from 1.0 × 10-2 to 4.0 × 100s-1. In general the friction coefficients (m values) increase slightly with increasing the com...
Electrodeposition is one of the fabrication techniques to produce nanocrystalline materials. In this paper, bulk nanocrystalline Ni (nc-Ni) was electrodeposited by using a sulfamate bath which generated low residual stress. In order to enhance tensile property of bulk nc-Ni, we investigated influences of glossing agents and bath condition on tensil...
The dynamic friction properties of the extruded AZ31 magnesium alloy with the initial average grain size of 15 μm were investigated by the ring compression test at 473 and 523 K and in a strain rate range from 1.0×10−2 to 3.0 s−1. Two types of the tool, WC-Co tool (WC) and WC-Co coated with diamond like carbon tool (DLC) were used. At 523 K, few di...
We examined the grain boundary energy (GBE) and grain boundary excess free volume (BFV) by applying the first-principles calculation
for six [110] symmetric tilt grain boundaries in aluminum to clarify the origin of GBE. The GBE increased linearly as BFV
increased. The elastic energy associated with BFV, namely the grain boundary elastic energy, wa...
Friction stir processing (FSP) is one of the severe plastic deformation processes that have been developed to improve the mechanical properties of both metals and alloys by producing an ultrafine-grained structure. In this study, it was used to realize the minimum grain size in Al-Mg alloys. The results indicate that the grain size in Al-Mg alloy d...
We investigated the influence of bath composition on characteristics in an electrodeposited bulk nanocrystalline Ni (nc-Ni). This study was aim to establish the fabrication process of bulk nc-Ni with good tensile property. The bulk nc-Ni was electrpdeposited from a sulfate bath and a sulfamate bath. The nc-Ni was evaluated for microstructure and me...
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Bulk nanocrystalline Ni (nc-Ni) was electrodeposited using a sulfamate bath with different gloss agents. Saccharin sodium, 2-butyne-1,4-diol and sodium allylsulfonate, which were popular gloss agents for Ni plating, were chosen as gloss agents. Mechanical properties were evaluated to investigate the influence of gloss agent types on tensile prop...
Homogeneous bulk amorphous Ni-W alloy with thickness of more than 2 mm is fabricated by an electroforming process. By suppressing the side reaction and by preserving the mass balance between consumed ions by electrodeposition and supplemented ions by the solution of Ni and W anodes in the electroforming system, the standard deviation of W-concentra...
Sn based alloys with high creep resistance are required for soldering applications This paper describes the effect of solid solution strengthening on the creep resistance of Sn Zn alloys The maximum solubility limit of Zn Is 0 34 mass% in Sn The creep behaviors of Sn Sn 0 1 mass%Zn and Sn 04 mass%Zn were examined at 298 and 398 K under constant str...
The dynamic friction properties of the extruded AZ31 magnesium alloy of the grain size of 20 pm were investigated by ring upsetting method test at 523, 548 and 573 K at strain rate of 1.0 x 10(-2) s(-1), where all the initial testing conditions were the climb-controlled dislocation creep. The MoS2 lubricant maintained lower dynamically friction coe...
Nanocrystalline materials with high strength have been reported in large numbers. In particular, there has been considerable research on electrodeposited nanocrystalline Ni (nc-Ni) and nc-Ni alloys. However, reported data vary widely especially in ductility. Therefore, it is necessary to obtain the true characteristic value of nc-Ni and nc-Ni alloy...
We investigate the energy of segregation of solute Ca at symmetric tilt Sigma 11(1 (1) over bar3)[110] grain boundary in aluminum from the first-principles calculations. As energy of segregation of Ca is negative, Ca atoms tend to segregate at the grain boundary. Furthermore, on basis of the Rice-Wang model, we study the effect of the segregation o...
The effect of the coating materials of the tools on the dynamic friction characteristics and microstructural evolution with straining was investigated by the ring-typed compressive test at a temperature of 473 K and at a strain rate of 10(-2) s(-1) in the extruded AZ31 magnesium alloy with an average grain size of 15 pm. The values of the dynamical...
We investigated the effect of pre-introduced shear bands direction on compressive deformation behavior in Zr55 Al10Ni 5Cu30 bulk metallic glass. The compressive deformation behavior varied with the difference of the direction of pre-introduced shear bands with respect to loading direction. The specimen in which shear bands were introduced at an ang...