Ti含量对Co_(39.2)Ni_(39.2)Al_(21.6-x)Ti_(x)双相高熵合金组织与力学性能的影响  

Effect of Ti Content on Microstructure and Mechanical Properties of the Co_(39.2)Ni_(39.2)Al_(21.6-x)Ti_(x)Tix Dual-phase High Entropy Alloys

作　　者：贺一轩 刘浩翔 李名扬 刘栩东 李金山[2] HE Yixuan;LIU Haoxiang;LI Mingyang;LIU Xudong;LI Jinshan(Collaborative Innovation Center of NPU,Northwestern Polytechnical University,Shanghai 201108,China;State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China;Center of Advanced Lubrication and Seal Materials,Northwestern Polytechnical University,Xi'an 710072,China)

机构地区：[1]西北工业大学上海闵行协同创新中心,上海201185 [2]西北工业大学凝固技术国家重点实验室,陕西西安710072 [3]西北工业大学先进密封材料与润滑研究中心,陕西西安710072

出　　处：《材料开发与应用》2024年第5期55-62,共8页Development and Application of Materials

基　　金：上海市扬帆计划项目(21YF1450800);西安市科协青年人才托举计划项目。

摘　　要：本研究设计并制备了成分为Co_(39.2)Ni_(39.2)Al_(21.6-x)Ti_(x)(x=2、4和6)的双相高熵合金。三种合金均为FCC-B2双相结构,FCC相中存在弥散的纳米级L1_(2)有序析出相,B2相中存在板条状L1_(0)马氏体相。随着Ti含量的增加,FCC相的体积分数、L1_(2)相的体积分数和尺寸均增大,B2相的体积分数减小。三种合金中,Co_(39.2)Ni_(39.2)Al_(15.6)Ti_(6)合金具有最优的强塑性匹配,这来源于变形过程中B2相中应力诱发的马氏体相变和FCC相中L1_(2)有序析出相提供的高加工硬化率。本研究为通过合金化调控双相高熵合金组织,优化其综合力学性能提供了理论参考依据。Three dual phase high entropy alloys with a composition of Co_(39.2)Ni_(39.2)Al_(21.6-x)Ti_(x)(x=2,4,and 6)are prepared in this work.All the three alloys display an FCC-B2 dual phase structure.Dispersed nanoscale L1_(2)ordered precipitate phases are presented in FCC,and lath-like L1_(0)martensite presented in B2 phase.With the increase of Ti content,the volume fractions of FCC and L1_(2)phases and size of L1_(2)phase increase,and the volume fraction of B2 phase decreases.The Co_(39.2)Ni_(39.2)Al_(15.6)Ti_(6)alloy shows the most excellent combination of strength and ductility.The high strength and plasticity come from the stress induced martensitic transformation in the B2 phase during the deformation process,and the high work hardening rate provided by the L1_(2)ordered precipitate phase in the FCC phase.This work provides a theoretical reference for designing the microstructure of the dual phase high entropy alloys through alloying to enhance their comprehensive mechanical properties.

关 键 词：双相高熵合金 合金化 力学性能 马氏体相变 

分 类 号：TG146.2[一般工业技术—材料科学与工程]