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Long-Term Creep Behavior of a CoCrFeNiMn High-Entropy Alloy
Journal of Materials Engineering and Performance ( IF 2.3 ) Pub Date : 2020-09-17 , DOI: 10.1007/s11665-020-05103-2
K. A. Rozman , M. Detrois , T. Liu , M. C. Gao , P. D. Jablonski , J. A. Hawk

The potential of high-entropy alloys (HEAs) to meet or exceed austenitic stainless steel performance with the additional benefit of improved hot corrosion/oxidation resistance makes FCC HEAs attractive for use in energy applications. While shorter-term creep tests have been reported in the literature on HEAs, not all methodologies utilize repeatable techniques. This manuscript reports on over 23,500 accumulated hours of tensile creep testing with adherence to ASTM standards on a melt-solidified ingot of CoCrFeNiMn HEA converted to wrought plate using conventional thermo-mechanical processing techniques. The typical standard creep analyses are reported, i.e., Larson–Miller parameter, Monkman–Grant relationship, activation energy for creep, and creep stress exponents were calculated and compared to previously reported short-term creep tests. Additionally, characteristics of creep fracture and microstructural evolution are reported with cursory dislocation mechanisms investigated.



中文翻译:

CoCrFeNiMn高熵合金的长期蠕变行为

高熵合金(HEA)达到或超过奥氏体不锈钢性能的潜力以及改进的抗热腐蚀/抗氧化性的额外好处使FCC HEA在能源应用中具有吸引力。虽然有关HEA的文献已经报道了短期蠕变测试,但并非所有方法都采用可重复的技术。该手稿报告了在使用常规热机械加工技术转换为锻造板的CoCrFeNiMn HEA熔融凝固铸锭上,按照ASTM标准进行的23500多个小时的累积拉伸拉伸蠕变测试。报告了典型的标准蠕变分析,即拉森-米勒参数,蒙克曼-格兰特关系,蠕变活化能和蠕变应力指数,并与先前报告的短期蠕变试验进行了比较。

更新日期:2020-09-18
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