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

作　　者：Jin-xiong Hou Jing Fan Hui-jun Yang Zhong Wang Jun-wei Qiao 

机构地区：[1]College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China [2]Key Laboratory of Interface Science and Engineering in Advanced Materials(Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2020年第10期1363-1370,共8页矿物冶金与材料学报（英文版）

基　　金：National Key Laboratory for Remanufacturing,Academy of Armored Forces Engineering(No.61420050204);the Transformation of Scientific and Technological Achievements Programs of Higher Education Institutions in Shanxi,China(No.2019BY044);Jinxiong Hou would like to acknowledge the financial support from the Graduate Science and Technology Innovation Fund Project of Shanxi,China(No.2019BY044).

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 50μm,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.

关 键 词：BORONIZING high-entropy alloys boride layers tensile strength cleavage fracture 

分 类 号：TG139[一般工业技术—材料科学与工程]