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Dendritic and spherical crystal reinforced metallic glass matrix composites

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International Journal of Minerals,Metallurgy and Materials 2013年第4期20卷 386-392页

作者： jun-wei Qiao Yong Zhang hui-jun yang Sheng-bo Sang Laboratory of Applied Physics and Mechanics of Advanced Materials College of Materials Science and Engineering Taiyuan University of Technology Key Laboratory of Interface Science and Engineering in Advanced Materials (Ministry of Education) Taiyuan University of Technology State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing MicroNano System Research Center Taiyuan University of Technology

Zr-based bulk metallic glass matrix composites （BMGMCs） with a composition of Zr60.0Ti14.7Nb5.3Cu5.6Ni4.4- Be10.0 （at%） were fabricated by an innovative process, i.e., semisolid processing plus Bridgman solidification. Different morphologies, distributions, and volume fractions of the crystalline phases can be achieved by tailoring the withdrawal velocity. The largest fi-acture strain of Zr60.0Ti14.7Nb5.3Cu5.6Ni4.4Be10.0 （at%） composites with the withdrawal velocity of 1.0 mm/s was found to be 16.7%. The mechanism of plasticity improvement is mainly attributed to the interpenetrated structure of the crystalline phase, which greatly confines the rapid propagation of shear bands.

关键词： metallic glass composite materials mechanical properties plastic deformation

Twinning induced remarkable strain hardening in a novel Fe_(50)Mn_(20)Cr_(20)Ni_(10) medium entropy alloy

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Journal of Iron and Steel Research International 2021年第11期28卷 1463-1470页

作者： Ming-jie Qin Xi Jin Min Zhang hui-jun yang jun-wei Qiao College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024ShanxiChina Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024ShanxiChina State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China

The microstructures and tension properties of Fe_(50)Mn_(20)Cr_(20)Ni_(10) medium entropy alloy(MEA)were investigated,which was produced by vacuum induction melting and subsequently was homogenized at 1200 C for 6 *** characterization shows the single-phase solid solution with face-centered cubic structure by means of transmission electron microscopy and scanning electron microscopy combined with energy disperse *** Fe-MEA has an ultimate tensile strength of 550±10 MPa and a high strain hardening exponent,n,of 0.41 as well as a higher ductility(60%)than those of CrMnFeCoNi *** single-phase solid solution deforms plastically via dislocations and *** boundaries associated with deformation twinning impede dislocation motion,enhancing the strain hardening *** article focuses on the insights into the concept of Fe-MEAs and provides a potential direction for the future development of high entropy alloys and MEAs.

关键词： Medium entropy alloy Alloy design Labusch model Twinning induced plasticity Strain hardening

Deformation behavior and plastic instability of boronized Al0.25CoCrFeNi high-entropy alloys

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International Journal of Minerals,Metallurgy and Materials 2020年第10期27卷 1363-1370页

作者： Jin-xiong Hou Jing Fan hui-jun yang Zhong Wang jun-wei Qiao College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Interface Science and Engineering in Advanced Materials(Ministry of Education Taiyuan University of TechnologyTaiyuan 030024China

Using thermochemical treatments,boronized layers were successfully prepared on Al0.25CoCrFeNi high-entropy alloys(HEAs).The thickness of the boronized layers ranged widely from 20 to 50μm,depending on the heat treatment *** remarkably improved the surface hardness from HV 188 to HV 1265 after treating at 900°C for 9 ***,boronizing enhanced the yield strength of HEAs from 195 to 265 MPa but deteriorated the tensile *** crackings in the boride layers significantly decreased the *** insufficient work-hardening capacity essentially facilitated the plastic instability of the boronized *** decreasing substrate thickness,the fracture modes gradually transformed from dimples to quasi-cleavage and eventually to cleavage.

关键词： boronizing high-entropy alloys boride layers tensile strength cleavage fracture

Hierarchical porous carbon derived from animal bone as matric to encapsulated selenium for high performance Li-Se battery

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Rare Metals 2017年第5期36卷 434-441页

作者： Li-Sheng Xie Sheng-Xue Yu hui-jun yang jun yang Jian-Lan Ni Jiu-Lin Wang Shanghai Electrochemical Energy Devices Research Center Department of Chemical EngineeringShanghai Jiao Tong UniversityShanghai 200240China College of Environment and Chemistry Engineering Yanshan UniversityQinhuangdao 066004China Shanghai Using Yuan Environmental Engineering Co. LtdShanghai 201801China

Animal bone was employed as raw material to prepare hierarchical porous carbon by KOH activation. Rare metal selenium（Se） was encapsulated into hierarchical porous carbon successfully for the cathode material of Li–Se battery, achieving the transformation of waste into energy,protecting environment and reducing the spread of the disease. Animal bone porous carbon（ABPC） acquires a specific surface area of 1244.7903 m^2·g^-1 and a pore volume of 0.594184 cm^3·g^-1. The composite Se/ABPC with 51 wt%Se was tested as a novel cathode for Li–Se batteries. The results show that Se/ABPC exhibits high specific capacity,good cycling stability and current-rate performance; at 0.1C,the composite Se/ABPC delivers a high reversible capacity of 705 mAh·g^-1 in the second cycle and 591 mAh·g^-1 after 98 cycles. Even at the current density of 2.0C, it can still maintain at a reversible capacity of 485 mAh·g^-1. The excellent electrochemical properties benefit from the high electron conductivity and the carbon with unique hierarchical porous structure. ABPC can be a promising carbon matrix for Li–Se batteries.

关键词： Se/ABPC Animal bones High rate capability Li–Se battery Hierarchical porous structure

Corrosion Behavior of Fe-based Bulk Metallic Glass and In-situ Dendrite-reinforced Metallic Glass Matrix Composites in Acid Solution

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Journal of Iron and Steel Research International 2016年第11期23卷 1200-1205页

作者： Fan yang Sheng-feng GUO Ai-dong LAN hui-jun yang He-feng ZHOU Laboratory of Applied Physics and Mechanics of Advanced Materials College of Materials Science and EngineeringTaiyuan University of Technology School of Materials Science and Engineering Southwest University Institute of Applied Mechanics and Biomedical Engineering Taiyuan University of Technology

The corrosion behavior study was conducted on a novel Fe77 Mo5P9C7.5 B1.5 in-situ metallic glass matrix composite （MGMC）. This composite sample was developed by introduction of bcc a-Fe dendrites as reinforcing phase. The corrosion behavior of this composite was compared to its monolithic counterpart and other Fe-based alloys such as 304L and 2304L stainless steels. The corrosion resistance of MGMCs in H2SO4 solution shows inferior to that of other Fe-based alloys. Experiments suggest that Fe-BMGs samples possess better corrosion resistance property than that of Fe-MGMCs. The possible underlying reasons can be the inhomogeneity induced by the precipitation of a-Fe dendrites in the MGMCs.

关键词： bulk metallic glass metallic glass matrix composite electrochemical test corrosion property

Tuning Cr-rich nanoprecipitation and heterogeneous structure in equiatomic CrFeNi medium-entropy stainless alloys

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Journal of Iron and Steel Research International 2022年第3期29卷 529-536页

作者： Kai Wang Xue-jiao Wang Tuan-wei Zhang Xi Jin hui-jun yang jun-wei Qiao College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan030024ShanxiChina College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan030024ShanxiChina State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China

High-/medium-entropy stainless alloys(HESAs/MESAs)are a new kind of alloys with great potential to combine excellent properties from high-/medium-entropy alloys(HEAs/MEAs)and stainless steels.A CrFeNi MESA was chosen to investigate its microstructures and mechanical *** homogenization,the strength and ductility of CrFeNi MESAs with single-phase face-centered-cubic(fcc)structure were higher compared with those of Fe_(100−x-y)Cr_(x)Ni_(y)austenitic stainless ***-rich body-centered-cubic(bcc)precipitates and heterogeneous structure were introduced by cold rolling and annealing at 800℃.Rolling at 700℃ results in higher dislocation density and the occurrence of lamellar Cr-rich bcc ***-density dislocations and fcc grains with heterogeneous structure,together with Cr-rich bcc precipitates,contribute to a yield strength improvement of about 50 MPa,and appreciable tensile yield strength of~540 MPa and fracture strain of~20%are *** reveals that not only compositional variations but also grain size and phase structure tuning can be utilized for achieving desired mechanical properties.

关键词： High-entropy stainless alloy Medium-entropy stainless alloy Mechanical property Warm rolling Heterogeneous structure Precipitation strengthening

Sliding tribological characteristics of Ti48Zr20Nb12Cu5Be15 metallic glass matrix composites under different conditions

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Journal of Iron and Steel Research International 2018年第3期25卷 282-290页

作者： Zhong-kun Bai Li-ming Du Ming Chen Min Zhang Xiao-hui Shi hui-jun yang College of Materials Science and Engineering TaiyuanUniversity of Technology Taiyuan 030024 Shanxi China

A systematic research on the tribological characteristics of Ti48Zr20Nb12Cu5Be15 metallic glass matrix composites was performed under different normal loads in dry condition and simulated seawater. The wear rate decreased with the increase in normal load under dry and simulated seawater conditions. The friction coefficient was lower in the dry condition than in the simulated seawater. The composite showed better wear resistance at lower loads （3, 5 and 10 N） hut poor wear resistance at higher loads （15 and 17 N） in the simulated seawater. The analysis of the worn surface illustrated that the wear mechanism in dry condition was plastic deformation, adhesive wear and abrasive wear at 3 and 5 N, while it was abrasive wear and adhesive wear at 10, 15 and 17 N. The wear mechanism in simulated seawater was abrasive wear, plastic deformation and adhesive wear at 3 N, adhesive wear at 10 N, and abrasive wear at 5, 15 and 17 N. At the same time, the corrosion occurred during wear tests in the simulated seawater.

关键词： Amorphous material Rapid solidification Friction Wear Corrosion

Tribological Properties of a Dendrite-reinforced Ti-based Metallic Glass Matrix Composite under Different Conditions

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Journal of Iron and Steel Research International 2016年第1期23卷 57-63页

作者： Teng ZHANG Xiao-min LIN hui-jun yang Yong LIU Yong-sheng WANG jun-wei QIAO Research Institute of Surface Engineering Taiyuan University of Technology

The tribological properties of the in-situ dendrite-reinforced metallic glass matrix composite（Ti42Zr22V14-Cu5Be17）prepared by copper mould casting were analyzed at different normal loads under the dry condition and *** results showed that the average value of the frictional coefficients and micro-hardness ascended with increasing the normal load,while the wear rate showed a trend of decline under the dry *** electrochemical test results showed that the surface of samples was pitting corroded in the *** matrices were corroded *** the dendrites were exposed,leading to the damage of the *** the frictional coefficients and wear rate of the composite in the rainwater were larger than those under the dry condition,primarily owing to the corrosion of chloride ions on the worn *** wear mechanisms of composites were mainly adhesive wear,accompanied by the abrasive wear under the dry condition and corrosive wear in the *** composites have higher wear resistance both under the dry condition and rainwater due to the lower wear rate.

关键词： sliding wear surface topography electrochemical test pitting corrosion

Tensile strength prediction of dual-phase Al0.6CoCrFeNi high-entropy alloys

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International Journal of Minerals,Metallurgy and Materials 2020年第10期27卷 1341-1346页

作者： Min Zhang Jin-xiong Hou hui-jun yang Ya-qin Tan Xue-jiao Wang Xiao-hui Shi Rui-peng Guo jun-wei Qiao College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China

The evolution of the microstructure and tensile properties of dual-phase Al0.6CoCrFeNi high-entropy alloys(HEAs)subjected to cold rolling was *** homogenized Al0.6CoCrFeNi alloys consisted of face-centered-cubic and body-centered-cubic phases,presenting similar mechanical behavior as the as-cast *** yield and tensile strengths of the alloys could be dramatically enhanced to^1205 MPa and^1318 MPa after 50%rolling reduction,respectively.A power-law relationship was discovered between the strain-hardening exponent and rolling *** tensile strengths of this dual-phase HEA with different cold rolling treatments were predicted,mainly based on the Hollomon relationship,by the strain-hardening exponent,and showed good agreement with the experimental results.

关键词： dual-phase high-entropy alloys cold rolling strain-hardening exponent tensile strength