高熵合金FeCoNiTi的微观组织演变和强韧化行为  

Microstructure Evolution and Strength-ductility Behavior of FeCoNiTi High-entropy Alloy

作　　者：刘怡 徐康 涂坚 黄灿[1] 吴玮[1] 谭力 张琰斌 尹瑞森 周志明[1,2] LIU Yi;XU Kang;TU Jian;HUANG Can;WU Wei;TAN Li;ZHANG Yanbin;YIN Ruisen;ZHOU Zhiming(School of Materials Science and Engineering,Chongqing University of Technology,Chongqing 400054,China;Chongqing Municipal Key Laboratory of Institutions of Higher Education for Mould Technology,Chongqing University of Technology,Chongqing 400054,China;School of Aerospace Engineering,Chongqing University,Chongqing 400030,China)

机构地区：[1]重庆理工大学材料科学与工程学院,重庆400054 [2]重庆理工大学,重庆市模具技术重点实验室,重庆400054 [3]重庆大学航天航空学院,重庆400044

出　　处：《材料研究学报》2020年第7期535-544,共10页Chinese Journal of Materials Research

基　　金：重庆市基础与前沿研究计划(2017jcyjAX0381);重庆市教委科技研究项目(KJQN201801139);国家博士面上资助(2018M632250)。

摘　　要：使用热力学软件设计了一种新型双相高熵合金(FeCoNiTi),利用真空电弧熔炼和热处理制备出FeCoNiTi高熵合金块体材料。表征结果表明,FeCoNiTi高熵合金由层状结构的Laves相和魏氏体板条FCC相组成。在室温下FeCoNiTi高熵合金具有良好的综合力学性能(抗压强度sb=2.08 GPa,压缩应变e=20.3%)。高强度来自"硬"Laves相(层状结构)的强化,而"软"FCC相(魏氏体板条)中的位错滑移和变形孪晶提供塑性。A new type of dual-phase high-entropy alloy(FeCoNiTi)was designed by means of thermodynamic software and then block material of FeCoNiTi high-entropy alloy was prepared via vacuum arc smelting and then heat treatment.Characterization results demonstrate that the as-homogenized FeCoNiTi alloy presents dual-phase microstructure composed of the lamellar structure(hexagonal close packed(Laves)phase)and the Widmanst?tten laths(face-centered cubic(FCC)phase).The FeCoNiTi alloy shows excellent comprehensive property at room temperature with compressive strength sb=2.08 GPa and compression strain e=20.3%.The high strength can mainly be attributed to the hard Laves phase(lamellar structure)strengthening;while dislocation slip and deformation twin in the soft FCC phase(Widmanst?tten laths)provide the ductility.

关 键 词：金属材料 高熵合金 强韧化 双相组织 魏氏体板条 

分 类 号：TG113.1[金属学及工艺—物理冶金]