CrTaTi难熔中熵合金的力学性能和抗氧化性能  

Mechanical Properties and Oxidation Resistance of a Refractory Medium-entropy Alloy CrTaTi

作　　者：史畅 杜宇航 赖利民 肖思明 郭宁[1] 郭胜锋[1] SHI Chang;DU Yuhang;LAI Liming;XIAO Siming;GUO Ning;GUO Shengfeng(School of Materials and Energy,Southwest University,Chongqing 400715,China)

机构地区：[1]西南大学材料与能源学院,重庆400715

出　　处：《材料研究学报》2023年第6期443-452,共10页Chinese Journal of Materials Research

基　　金：国家自然科学基金(52071276)。

摘　　要：根据成分设计制备出等原子比CrTaTi难熔中熵合金,研究这种合金的室温力学性能和高温抗氧化行为。结果表明,这种合金的铸态由bcc基体相和少量的Cr_(2)Ta Laves相组成,固溶强化和析出强化的协同作用使其具有良好的室温综合力学性能,压缩屈服强度和断裂应变分别为1500 MPa和22%。在600~1000℃的高温CrTaTi难熔中熵合金的短时抗氧化性能优异,其原因是在其表面生成了含TiO_(2)和Cr_(2)O_(3)的复合氧化层,即使在1000℃氧化10 h其氧化增重也只有8.4 mg/cm^(2)。A new refractory medium-entropy alloy of CrTaTi has been successfully developed through the reasonably composition design,and the room-temperature mechanical properties and hightemperature oxidation resistance of the alloy were systematically investigated in this paper.The results show that the as-cast alloy is composed of bcc phase matrix and a small amount of Cr_(2)Ta Laves phase.The solid solution strengthening and precipitation strengthening make the alloy with good comprehensive mechanical properties at room-temperature.During the short-term oxidation test at medium-and hightemperatures a composite oxide scale containing TiO_(2) and Cr_(2)O_(3) preferentially formed on the alloy surface,showing excellent oxidation resistance.The oxidation weight gain of CrTaTi alloy is only 8.4 mg/cm^(2) after oxidation in air at 1000℃for 10 h.

关 键 词：金属材料 难熔中熵合金 微观结构 室温力学性能 高温抗氧化 

分 类 号：TB31[一般工业技术—材料科学与工程]