摘要
设计并用真空电弧熔炼法制备了五主元(Ti_(1/4)Zr_(1/4)V_(1/4)Nb_(1/4))Al_(x)高熵金属间化合物合金,研究了铸态及高温退火后合金的晶体结构、显微组织及硬度的变化。结果表明,(Ti_(1/4)Zr_(1/4)V_(1/4)Nb_(1/4))Al_(x)高熵金属间化合物合金以D0_(22)有序化合物结构为基体,夹杂少量的L1_(0)析出相。合金组织为树枝晶组织,由于枝晶相和枝晶间相的元素分布不同,使合金产生了相分离现象。(Ti_(1/4)Zr_(1/4)V_(1/4)Nb_(1/4))Al_(3.5)合金中L1_(0)相含量最少,并且在1300℃热处理后基本消失,合金转变为完全由有序的D0_(22)相组成。此合金在1400℃高温下仍能保持铸态的基体结构,没有析出其他相,表明此合金具有极好的高温热稳定性。
Five principal-element(Ti_(1/4)Zr_(1/4)V_(1/4)Nb_(1/4))Al_(x) high-entropy intermetallic compounds were designed and prepared by vacuum arc melting method.The changes in crystal structures,microstructures and hardnesses of as-cast and high-temperature annealed alloys were investigated in detail.The results indicated that the(Ti_(1/4)Zr_(1/4)V_(1/4)Nb_(1/4))Al_(x) high entropy intermetallic compounds were based on ordered D022 structure with a small amount of L1_(0) precipitates.The alloys′microstructure was a dendritic structure.Because of the different distribution of elements in dendritic and interdendritic regions,phase separation phenomenon occurs in the alloys.The(Ti_(1/4)Zr_(1/4)V_(1/4))Al_(3.5) alloy had the least content of L1_(0) phase,which basically disappeared after heat treatment at 1300℃.This alloy could still maintain its as-cast matrix structure at a high temperature up to 1400℃without precipitation of other phases,indicating that it had excellent high-temperature thermal stability.
作者
覃业恒
张越
张骁
杨程
陈迅
王乔
赵鹏程
刘亮
QIN Ye-heng;ZHANG Yue;ZHANG Xiao;YANG Cheng;CHEN Xun;WANG Qiao;ZHAO Peng-cheng;Liang(Department of Materials Science and Engineering,Liaoning University of Technology,Jinzhou 121001,Liaoning,China)
出处
《铸造》
CAS
2024年第8期1059-1064,共6页
Foundry
关键词
高熵合金
金属间化合物
热处理
显微组织
晶体结构
high entropy alloy
intermetallic compounds
heat treatment
microstructure
crystal structure
