超细晶CoCrMnFeNi高熵合金的变形行为及应变速率敏感性  

Deformation Behavior and Strain Rate Sensitivity of Ultrafine Grained CoCrMnFeNi High-entropy Alloy

作　　者：任伟宁 杨军[2] 张长军[1] REN Weining;YANG Jun;ZHANG Changjun(School of Material Science and Engineering,Chang'an University,Xi'an 710064,China;Changqing Down-hole Operation Company,CNPC Chuan-Qing Drilling Engineering Co.,Ltd.,Xi'an 710021,China)

机构地区：[1]长安大学材料科学与工程学院,陕西西安710064 [2]中国石油天然气集团公司川庆钻探工程有限公司长庆井下技术作业公司,陕西西安710021

出　　处：《热加工工艺》2019年第20期25-28,共4页Hot Working Technology

基　　金：陕西省科技统筹创新工程计划项目(2016KTZDGY09-06-02);陕西省重点研发计划项目(2018ZDXM-GY-123);陕西省教育厅专项科研计划项目(14JK1533)

摘　　要：采用低温冷轧及短时间退火制备了具有超细晶结构的CoCrMnFeNi高熵合金。通过准静态拉伸,研究了材料在77~573K的变形行为和应变率敏感性。结果表明,加工的材料在77 K具有优异的综合力学性能。随着实验温度由298 K提高到473 K,超细晶材料的强度增加,塑性降低。超细晶高熵合金的应变速率敏感系数明显低于粗晶的,并在298~473K急剧降低。High entropy CoCrMnFeNi alloy with ultrafine crystal structure was prepared by low temperature cold rolling and short time annealing.The deformation behavior and strain rate sensitivity of the material in the range of 77-573 K were studied by quasi-static stretching. The results show that the processed materials have excellent comprehensive mechanical properties at 77 K. As the test temperature increases from 298 K to 473 K, the strength of the ultrafine material increases and the plasticity decreases. The strain rate sensitivity coefficient of ultrafine high entropy alloy is significantly lower than that of coarse crystal alloy, and decreases sharply at 298-473 K.

关 键 词：低温轧制 高熵合金 超细晶 应变率敏感性 

分 类 号：TG135.1[一般工业技术—材料科学与工程]