高熵合金L1_(2)纳米析出相的调控研究进展  

Research Progress on the Control of L1_(2) Nanoprecipitation in High-entropy Alloys

作　　者：徐庆星 戴凌锐 沈宇凡 李洪超 王军[1] 李金山[1] XU Qingxing;DAI Lingrui;SHEN Yufan;LI Hongchao;WANG Jun;LI Jinshan(State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China)

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《铸造技术》2023年第8期737-747,共11页Foundry Technology

基　　金：国家重点研发项目(2022YFB3707103);国家自然科学基金(52174375);国家大学生创新创业训练计划(S202210699240)。

摘　　要：高熵合金是一种由多种合金元素以等原子比或近等原子比组成的新型金属材料,其独特的原子结构和合金设计理念使高熵合金具有优异的性能。在高熵合金中通过引入韧性的L12纳米析出相阻碍位错运动,不仅可以提高强度还可以保证良好的拉伸塑性,这种L12析出相强化的高熵合金引起了广泛关注。对于L12相析出强化高熵合金而言,调控析出相的大小、形貌、分布及体积分数对改善析出强化高熵合金的力学性能至关重要。基于此,本文回顾了合金成分的选择和热机械处理工艺参数,如时效温度、时效时间、塑性变形等对L12相的影响规律,总结设计新型L12相强化高熵合金的方法,并对L12相析出强化高熵合金的研究进行了综述和展望。High-entropy alloys are a new type of metal material composed of various alloy elements with equal or nearly equal atomic ratios.High-entropy alloys have excellent properties due to their unique atomic structure and alloy design concept.In the precipitation strengthened high-entropy alloys,the ductile L1_(2) nanoprecipitation can hinder the dislocation movement.This phenomenon can not only improve the strength but also ensure good ductility,which has attracted widespread research interest.Furthermore,it is important to control the size,morphology,distribution and volume fraction of the Ll_(2) phase in the alloy to improve the mechanical properties of precipitation strengthened high-entropy alloys.Based on this,the influences of alloy composition and thermal-mechanical treatment process parameters such as aging temperature,aging time and plastic deformation on the L2 phase are reviewed in this article.Additionally,the methods for designing new Ll_(2) phase strengthened high entropy alloys are summarized.Finally,the research on Ll2-precipitation strengthened high entropy alloys is briefly summarized and outlooked.

关 键 词：高熵合金 析出强化 成分调控 热机械处理 

分 类 号：TG146[一般工业技术—材料科学与工程]