摘要
采用真空感应熔炼法制备Al0.3CoCrFeNi高熵合金,对其进行不同变形量(30%,60%,90%)的轧制变形,利用光学显微镜、扫描电镜、X射线衍射仪、显微硬度计、电子拉伸机和电化学方法等研究不同变形量合金的显微组织、力学性能和耐腐蚀性能。结果表明:铸态Al0.3CoCrFeNi高熵合金具有等轴晶组织,在轧制过程中晶粒沿着轧制方向被拉长细化,经90%变形量轧制后形成了纤维状组织;随变形量的增加,Al0.3CoCrFeNi高熵合金的硬度和强度都得到提高,但是伸长率却下降;在质量分数为3.5%的NaCl溶液中,轧制合金的自腐蚀电流密度较铸态合金的大,表现出较差的耐蚀性。
A1O3 CoCrFeNi high-entropy alloys （HEAs） were prepared by vacuum induction melting and then were rolled at different deformation degrees （30 %, 60%, 90 %）. Microstructure, mechanical property and corrosion resistance property of these HEAs were investigated by OM, SEM, XRD, microhardness testing, tensile testing and electrochemical method. The results show that the grains in cast HEAs exhibited equiaxed, and were elongated along the rolling direction and finally formed fibrous microstructure during rolling. The hardness and strength of HEAs increased with the increase of the deformation degree, but the elongation decreased. In 3.5wt.% NaC1 solution, HEAs had higher corrosion current density in roiled state than in cast state, showing lower corrosion resistance.
出处
《机械工程材料》
CAS
CSCD
北大核心
2015年第8期51-54,86,共5页
Materials For Mechanical Engineering
基金
福建省自然科学基金资助项目(2012J01202)
福建省教育厅科技项目(JA11179)
关键词
高熵合金
轧制
力学性能
腐蚀
high-entropy alloy
rolling
mechanical property
corrosion
