退火温度对CoCrCu_(0.5)FeTi_(0.5)Al_(x)高熵合金微观组织与耐腐蚀性能的影响  

Effect of annealing temperature on microstructure and corrosion resistanceof CoCrCu_(0.5)FeTi_(0.5)Al_(x)high-entropy alloy

作　　者：秦忠 李新梅[1] 田志刚 黄永 陈霸 QIN Zhong;LI Xinmei;TIAN Zhigang;HUANG Yong;CHEN Ba(School of Mechanical Engineering,Xinjiang University,Urumqi 830047,China)

机构地区：[1]新疆大学机械工程学院,乌鲁木齐830047

出　　处：《功能材料》2022年第8期8153-8158,共6页Journal of Functional Materials

基　　金：国家自然科学基金项目(51865055,52161017)

摘　　要：为了研究不同退火温度对CoCrCu_(0.5)FeTi_(0.5)Al_(x)高熵合金性能的影响,通过真空电弧熔炼CoCrCu_(0.5)FeTi_(0.5)Al_(x)(x=0、0.4、0.8)高熵合金并使用真空管式炉进行600,800,1000℃退火实验。使用XRD测试合金的晶体结构,采用SEM观察合金微观组织,利用维氏显微硬度计和电化学工作站测试高熵合金的显微硬度和耐腐蚀性能。结果表明,退火后的高熵合金出现新的Laves相,合金相主要由FCC、BCC和Laves相混合组成。在CoCrCu_(0.5)FeTi_(0.5)Al_(x)(x=0、0.4、0.8)高熵合金中,x=0.4的硬度在600℃退火状态下达到最大值为883.15HV。1000℃退火下的CoCrCu_(0.5)FeTi_(0.5)Al_(0.4)耐腐蚀性能达到最优,腐蚀电压和腐蚀电流密度分别为-0.396 V和6.800×10^(-7)mA/mm^(2)。In order to study the effect of different annealing temperatures on the properties of CoCrCu_(0.5)FeTi_(0.5)Al_(x)high entropy alloy,CoCrCu_(0.5)FeTi_(0.5)Al_(x)(x=0,0.4,0.8)high entropy alloy was melted by vacuum arc and annealed at 600,800 and 1000℃in a vacuum tube furnace.XRD was used to test the crystal structure of the alloy,SEM was used to observe the microstructure of the alloy,Vickers microhardness tester and electrochemical workstation were used to test the microhardness and corrosion resistance of the high entropy alloy.The results show that new Laves phases appear in the high entropy alloy after annealing,and the alloy phases are mainly composed of FCC,BCC and Laves phases.In CoCrCu_(0.5)FeTi_(0.5)Al_(x)(x=0,0.4,0.8)high entropy alloy,the hardness of x=0.4 reaches the maximum 883.15 HV at 600℃annealing.The corrosion resistance of CoCrCu_(0.5)FeTi_(0.5)Al_(0.4)annealed at 1000℃is the best,and the corrosion voltage and current density are-0.396 V and 6.800×10^(-7)mA/mm^(2),respectively.

关 键 词：高熵合金 微观组织 退火温度 腐蚀性能 

分 类 号：TG230.2[金属学及工艺—铸造]