(Ti1/4Zr1/4V1/4Nb1/4)Alx高熵金属间化合物合金的组织结构研究
Study on Microstructure and Crystal Structure of(Ti1/4Zr1/4V1/4Nb1/4)Alx High Entropy Intermetallic Compounds
覃业恒 1张越 1张骁 1杨程 1陈迅 1王乔 1赵鹏程 1刘亮1
作者信息
- 1. 辽宁工业大学材料科学与工程学院,辽宁锦州 121001
- 折叠
摘要
设计并用真空电弧熔炼法制备了五主元(Ti1/4Zr1/4V1/4Nb1/4)Alx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,(Ti1/4Zr1/4V1/4Nb1/4)Alx高熵金属间化合物合金以D022有序化合物结构为基体,夹杂少量的L10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.(Ti1/4Zr1/4V1/4Nb1/4)Al3.5合金中L1.相含量最少,并且在1 300 ℃热处理后基本消失,合金转变为完全由有序的D022相组成.此合金在1 400℃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.
Abstract
Five principal-element(Ti1/4Zr1/4V1/4Nb1/4)Alx 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(Ti1/4Zr1/4V1/4Nb1/4)Alx high entropy intermetallic compounds were based on ordered D022 structure with a small amount of L10 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(Ti1/4Zr1/4V1/4Nb1/4)Al3.5 alloy had the least content of L10 phase,which basically disappeared after heat treatment at 1 300 ℃.This alloy could still maintain its as-cast matrix structure at a high temperature up to 1 400 ℃ without precipitation of other phases,indicating that it had excellent high-temperature thermal stability.
关键词
高熵合金/金属间化合物/热处理/显微组织/晶体结构Key words
high entropy alloy/intermetallic compounds/heat treatment/microstructure/crystal structure引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据