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| 1 | Differences in dry sliding wear behavior between HVAF-sprayed amorphous steel and crystalline stainless steel coatings显示文摘Dry sliding wear behavior of amorphous steel coating(ASC) and crystalline stainless steel coating(SSC)manufactured by high-velocity-air-fuel-spraying was investigated. With increasing normal load, coefficient of friction(COF) of ASC decreases slightly from 0.78 to 0.69. COF of SSC presents a minor difference under various normal loads but increases with sliding time accompanied by relatively large fluctuation.Such a difference in friction behavior between such two coatings can be understood based upon the roles of shear stress and flash temperature. Wear rate of SSC is much higher than that of ASC, suggesting better wear resistance of ASC. The enhanced wear resistance is correlated with high hardness(H), reduced Young’s modulus(E_r), and ratios of H/Erand H^3/Er^2. Detailed analyses on worn surfaces and sub-surfaces indicate that the wear mechanisms for ASC include delamination, abrasive and oxidation wear, whereas those for SSC are delamination and oxidation. | Hui Guo Suode Zhang Wenhai Sun Jianqiang Wang | 2019 | Journal of Materials Science & Technology2019，35，5： | 6 |
| 2 | Impact of gas pressure on particle feature in Fe-based amorphous alloy powders via gas atomization:Simulation and experiment显示文摘Gas atomization is now an important production technique for Fe-based amorphous alloy powders used in additive manufacturing,particularly selective laser melting,fabricating large-sized Fe-based bulk metallic glasses.Using the realizable k-εmodel and discrete phase model theory,the flow dynamics of the gas phase and gas-melt two-phase flow felds in the close-wake condition were investigated to establish the correlation between high gas pressure and powder particle characteristics.The locations of the recirculation zones and the shapes of Mach disks were analyzed in detail for the type of discrete-jet closed-coupled gas atomization nozzle.In the gas-phase flow feld,the vortexes,closed to the Mach disk,are found to be a new deceleration method.In the two-phase flow feld,the shape of Mach disk changes from“S”-shape to“Z”-shape under the impact of the droplet flow.As predicted by the wave model,with the elevation of gas pressure,the size of the particle is found to gradually decrease and its distribution becomes more concentrated.Simulation results were compliant with the Fe-based amorphous alloy powder preparation tests.This study deepens the understanding of the gas pressure impacting particle features via gas atomization,and contributes to technological applications. | Yutong Shi Weiyan Lu Wenhai Sun Suode Zhang Baijun Yang Jianqiang Wang | 2022 | Journal of Materials Science & Technology2022，，10： | 4 |
| 3 | Phase Evolution and Glass Formation in an Fe-Based Alloy显示文摘The understanding of phase competing is of pretty importance in designing high glass-forming systems. In this work, it has been investigated experimentally and theoretically the phase evolution and glass formation of a wedge-casting Fe-based alloy. The results indicated that the phase formation was sensitive to the wedge position, i.e., there were amorphous phase, Fe_(2)P, {Fe, Ni} and α-Fe precipitates as well as M_(23)B_(6) phase at the distances of 3, 10 and 20 mm away from the wedge-tip, respectively. These were closely connected with the variation of cooling rate, embodied in the heat transfer at the solidification process. Furthermore, we constructed the time–temperature-transformation (TTT) diagrams of the iron-based alloy and these crystal phases through calculating Rc-related functions. Finally, the glass-forming features of the wedge-shaped Fe-based alloy have been elucidated in accordance with a crystallization kinetics analysis of the recorded temperature data and the phase selection competition. This research provides us an insight into in-depth understanding bulk metallic glass from the perspective of kinetics competition of crystallization phases. | Ping Huang Yutong Shi Wei Zhang Suode Zhang Yinglei Ren Keqiang Qiu Jianqiang Wang | 2023 | Acta Metallurgica Sinica(English Letters)2023，36，9： | 0 |
| 4 | Synthesis of Ag-Cr thin film metallic glasses with enhanced sulfide-resistance显示文摘The thin film glass forming region of the immiscible Ag-Cr binary system was explored by combinatorial sputtering.The electrochemical behavior of Ag-Cr alloy films with different Cr content in different corrosive environments containing S^2-or Cl-were investigated in comparison with those of pure silver.The Ag-Cr thin film metallic glasses(TFMG)exhibit much enhanced corrosion resistance in 0.01 M K2S solution,comparing with that of the bulk silver,the Ag50 Cr50 TFMG exhibits much higher corrosion potential as well as two orders of magnitude lower corrosion current density.Nevertheless,no obvious improvement of the corrosion resistance can be found for the glassy films in 0.1 M NaCl solution. | Peng jia Ruiwen Huang Suode Zhang Engang Wang Jiahao Yao | 2020 | Journal of Materials Science & Technology2020，52，18： | 0 |
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