Deformation behavior and plastic instability of boronized Al0.25CoCrFeNi high-entropy alloys
来源期刊：International Journal of Minerals Metallurgy and Materials2020年第10期
论文作者：Jin-xiong Hou Jing Fan Hui-jun Yang Zhong Wang Jun-wei Qiao
文章页码：1363 - 1370
摘 要：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 50 μm, depending on the heat treatment time. Boronizing remarkably improved the surface hardness from HV 188 to HV 1265 after treating at 900°C for 9 h. Moreover, boronizing enhanced the yield strength of HEAs from 195 to 265 MPa but deteriorated the tensile ductility. Multiple crackings in the boride layers significantly decreased the plasticity. The insufficient work-hardening capacity essentially facilitated the plastic instability of the boronized HEAs. With decreasing substrate thickness, the fracture modes gradually transformed from dimples to quasi-cleavage and eventually to cleavage.
Jin-xiong Hou1，Jing Fan1，Hui-jun Yang1，Zhong Wang1，Jun-wei Qiao1,2
1. College of Materials Science and Engineering, Taiyuan University of Technology2. Key Laboratory of Interface Science and Engineering in Advanced Materials (Ministry of Education), Taiyuan University of Technology
摘 要：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 50 μm, depending on the heat treatment time. Boronizing remarkably improved the surface hardness from HV 188 to HV 1265 after treating at 900°C for 9 h. Moreover, boronizing enhanced the yield strength of HEAs from 195 to 265 MPa but deteriorated the tensile ductility. Multiple crackings in the boride layers significantly decreased the plasticity. The insufficient work-hardening capacity essentially facilitated the plastic instability of the boronized HEAs. With decreasing substrate thickness, the fracture modes gradually transformed from dimples to quasi-cleavage and eventually to cleavage.
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