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博士生齐永良关于通过晶界相变来提高晶界析出强化高熵合金性能的论文被JMST 录用！
发布者: 江峰 | 2021-01-12 | 304
通过晶界析出相发生相变使得晶界析出强化高熵合金 （ FeCoNiCr)90Ti5Al5   获得断裂强度超过了1.5GPa，延伸率达到38%。 
 
本工作由本单位西安交大、南京理工大学、西北工业大学共同完成，博士生齐永良为第一作者， 西北工业大学刘峰教授、本单位孙军教授和江峰教授为共同通讯作者。
 
Enhanced mechanical performance of grain boundary precipitation hardened high-entropy alloys via a phase transformation at grain
boundaries
Y. L. Qi1 , L. Zhao1, X. Sun1, H. X. Zong1 , X. D. Ding1 , F. Jiang1, *, H. L. Zhang1 , Y.
K. Wu1 , L. He1 , F. Liu2, *, S. B. Jin3 , G. Sha3 , J. Sun1, *
1 State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong
University, Xi’an, Shanxi 710049, China
2Analytical & Testing Center, Northwestern Polytechnical University, Xi'an, Shanxi
710072, China
3 School of Materials Science and Engineering, Nanjing University of Science and
Technology, Jiangsu, 210094, China
*Corresponding authors E-mail: jiangfeng@ mail.xjtu.edu.cn; junsun@mail.xjtu.edu.cn;
liufeng@nwpu.edu.cn
 
Abstract
Grain-boundary (GB) precipitation has a significant adverse effect on plasticity of alloys, which easily leads to catastrophic intergranular failure in safety-critical
applications under high external loading. Herein, we report a novel strategy that uses the local stress concentration induced by GB precipitates as a driving force to trigger

 

phase transformation of preset non-equiatomic high-entropy solid-solution phase at GBs. This in situ deformation-induced phase transformation at GBs introduces a well
known effect: transformation-induced plasticity (TRIP), which enables an exceptional elongation to fracture (above 38%) at a high strength (above 1.5 GPa) in a GB
precipitation-hardened high-entropy alloy (HEA). The present strategy in terms of “local stress concentration-induced phase transformations at GBs” may provide a
fundamental approach by taking advantage of (rather than avoiding) the GB precipitation to gain a superior combination of high strength and high ductility in HEAs.
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