摘要
采用轧制变形和退火处理相结合的方法,制备力学性能和摩擦学性能优异的超细晶CrCoNi中熵合金,利用电子背散射衍射(EBSD)和透射电镜(TEM)对CrCoNi中熵合金的显微结构进行表征。结果表明:低温轧制后650℃退火10 min的材料屈服强度高达1135 MPa,均匀伸长率为14.1%,另一组室温轧制后650℃退火20 min的材料屈服强度为987 MPa,均匀伸长率提高至18.6%;以上工艺处理后的CrCoNi中熵合金的晶粒尺寸得到极大细化,平均晶粒尺寸仅0.81μm和0.92μm;这种超高强度是由于高角度晶界的晶界强化和低角度晶界的位错强化;同时超细晶中熵合金具有很高的耐磨性能。
The ultrafine-grained(UFG) CrCoNi medium entropy alloys(MEAs) with excellent mechanical and tribological performances were fabricated by combining rolling deformation and annealing treatment. The microstructures of CrCoNi MEAs were characterized by electron backscatter diffraction(EBSD) and transmission electron microscope(TEM). The results show that the materials annealed at 650 ℃ for 10 min after cryogenic rolling display a yield strength as high as 1135 MPa and a graceful uniform ductility of 14.1%. Another group of materials rolled at room temperature followed by annealing at 650 ℃ for 20 min exhibit a yield strength of 987 MPa and an improved ductility of 18.6%. In addition, the grains of CrCoNi medium entropy alloys after above treatment are greatly refined to an average grain size of 0.81 μm and 0.92 μm respectively. The ultra-high strength is due to the grain boundary strengthening of high angle boundaries and dislocation strengthening of low angle boundaries. Remarkably,such UFG MEAs exhibit high wear resistance.
作者
宋凌云
王艳飞
王明赛
郭凤娇
何琼
冉昊
文勇
黄崇湘
SONG Lingyun;WANG Yanfei;WANG Mingsai;GUO Fengjiao;HE Qiong;RAN Hao;WEN Yong;HUANG Chongxiang(School of Aeronautics and Astronautics,Sichuan University,Chengdu 610065,China)
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2020年第4期62-70,共9页
Journal of Aeronautical Materials
基金
四川省青年科技基金资助项目(2016JQ0047)。
关键词
中熵合金
强度和塑性
耐磨性能
超细晶
再结晶
medium entropy alloy
strength and ductility
wear resistance
ultrafine-grained microstructure
recrystallization
