摘要
针对高熵合金工程结构应用中“强塑性倒置”这一难题,通过冷轧与热处理组合方法制备了一种具有混晶组织的FeMnCoCr高熵合金,并研究了不同退火温度和时间对其微观组织和力学性能的影响规律。结果表明,退火温度的提高可以促进动态再结晶晶粒的形核与长大,增加了粗晶与超细晶的晶粒尺寸差异度,提高了粗晶比例;其中,730℃退火具有显微硬度213 HV、屈服强度574 MPa、抗拉强度986 MPa和断后延伸率42%的最佳综合强塑性,其强塑积可达35.9%。
In order to address the tough issue of‘strong-ductility trade-off’for the structural application of high entropy alloy(HEA),a FeMnCoCr high entropy alloy with heterogeneous grain size was prepared by the combination of cold rolling and heat treatment,and the effects of different annealing temperature and time on its microstructure and mechanical properties were studied.The results showed that the increase of annealing temperature could promote the nucleation and growth of dynamically recrystallized grains,and enhanced the difference in grain size between coarse and ultrafine grains,as well as the proportion of coarse grains.Additionally,an annealing temperature of 730℃contributed to the best comprehensive strength and plasticity combination of micro-hardness 213 HV,yield strength 705 MPa,tensile strength 910 MPa and fracture elongation 42.5%.The product of strength and tensile elongation reached approximately at the high value of 35.9%.
作者
黎雨
徐春
LI Yu;XU Chun(School of Material Science and Engineering,Shanghai Institute of Technology,Shanghai 201418,China)
出处
《应用技术学报》
2024年第2期197-202,207,共7页
Journal of Technology
基金
上海应用技术大学引进人才科研启动项目(YJ2021-4)资助。
关键词
高熵合金
混晶组织
退火
力学性能
high entropy alloy
heterogeneous structure
annealing
mechanical property
作者简介
黎雨(1994-),男,博士,副教授,主要研究方向为高强韧金属材料的异质结构设计。E-mail:yu01971128@163.com。
