高熵合金拉伸测试不确定性和力学性能表征  

Measurement uncertainty and representation of mechanical properties for high-entropy alloys

作　　者：徐庭栋[1] 于鸿垚[1] 王凯[1] 郑宗文[1] 甘斌 XU Ting-dong;YU Hong-yao;WANG Kai;ZHENG Zong-wen;GAN Bin(High Temperature Materials Research Institute,Central Iron and Steel Research Institute,Beijing 100081,China)

机构地区：[1]钢铁研究总院高温材料研究所,北京100081

出　　处：《钢铁研究学报》2020年第10期909-915,共7页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(51871064)。

摘　　要：高熵合金的拉伸力学性能测试不确定性,使现行传统的拉伸(压缩)试验技术,不适合于高熵合金的力学性能测量。金属拉伸力学性能测试不确定性,是拉伸试验弹性变形阶段,张应力改变了被测金属原子水平上的微观结构引起的。在此弹性变形微观理论基础上,提出用"力学性能-拉伸应变速率"曲线,表征高熵合金的原始力学性能,服役力学性能,以及加工变形力学性能。The measurement uncertainty of high-entropy alloys made the present technology of tensile(compression) test not to be able to use for the measurement of mechanical property of high-entropy alloy. The microscopic theory of metal elastic deformation reveals that the measurement uncertainty can be attributed to the microstructure change of the tested metals on the atomic level caused by tensile stress in the elastic deformation stage of tensile test. On the basis, it is suggested that for the high-entropy alloys a "mechanical properties-tension strain rate" curve was used for the characterization of the original mechanical property,service mechanical property and mechanical property during processing and deformation.

关 键 词：缺陷 高熵合金 力学性能 测试不确定性 测试标准 

分 类 号：TG139[一般工业技术—材料科学与工程]