通过L12结构的纳米相强化新型不混溶高熵合金
A novel immiscible high entropy alloy strengthened via L12-nanoprecipitate
王政钦 1范明雨 1张洋 1李俊澎 1刘力源 1韩基鸿 1李星豪 1张中武1
作者信息
- 1. Key Laboratory of Superlight Materials and Surface Technology,Ministry of Education,College of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,China
- 折叠
摘要
低成本的Fe-Cu,Fe-Ni和Cu基的高熵合金展现出了广泛的应用前景.然而,它们的低强度限制了其潜在的应用.在这项研究中,开发了一种新型的Fe31Cu31Ni28Al4Ti3Co3不混溶高熵合金.经过真空电弧熔炼和铜模吸铸后,该高熵合金展示出独特的相分离微观结构,由条纹状的富Cu区域和富Fe区域组成.进一步放大条纹状富Cu区域后发现,它由富Cu的点状相和富Fe区域组成.经过时效处理的合金通过L12-Ni3(AlTi)纳米析出物进一步强化,实现了优异的屈服强度(1185 MPa)和均匀伸长率(约8.8%).L12纳米析出相在条纹状富Cu区域和外部富Fe区域的差异分布增加了这两个区域之间的强度差异,从而增加了应变梯度,进而提高了异质变形诱导硬化的效果.这项工作为提高Fe-Cu合金的异质结构硬化效果提供了新的途径.
Abstract
The low-cost Fe-Cu,Fe-Ni,and Cu-based high-entropy alloys exhibit a widespread utilization prospect.However,these potential applications have been limited by their low strength.In this study,a novel Fe31Cu31Ni28Al4Ti3Co3 immiscible high-entropy alloy(HEA)was developed.After vacuum arc melting and copper mold suction casting,this HEA exhibits a unique phase separation microstructure,which consists of striped Cu-rich regions and Fe-rich region.Further magnification of the striped Cu-rich region reveals that it is composed of a Cu-rich dot-like phase and a Fe-rich region.The aging alloy is further strengthened by a L12-Ni3(AlTi)nanoprecipitates,achieving excellent yield strength(1185 MPa)and uniform ductility(～8.8%).The differential distribution of the L12 nanoprecipitate in the striped Cu-rich region and the external Fe-rich region increased the strength difference between these two regions,which increased the strain gradient and thus improved hetero-deformation induced(HDI)hardening.This work provides a new route to improve the HDI hardening of Fe-Cu alloys.
关键词
异质结构/沉淀强化/高熵合金/相分离/力学性能Key words
heterogeneous microstructure/precipitation strengthening/high-entropy alloy/phase separation/mechanical property引用本文复制引用
基金项目
National Natural Science Foundation of China(52001083)
National Natural Science Foundation of China(52171111)
National Natural Science Foundation of China(U2141207)
Natural Science Foundation of Heilongjiang,China(LH2020E060)
出版年
2024
NETL
NSTL
万方数据