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Excellent high cyclic fatigue properties of a novel ultrafine-grained medium entropy alloy

机译：新型超细晶粒中熵合金的优异高循环疲劳性能

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摘要

Fatigue is a major cause of failure and requires dedicated investigation to validate the integrity of potential structural materials. As high and medium entropy alloys (HEAs and MEAs) are garnering significant attention from scientific communities, it is important to test the structural integrity of these novel alloys in cyclic loading environment. This study analyzed both monotonic and cyclic loading properties of a novel medium entropy alloy (MEA) CoCri.3Ni in the ultrafine-grained (UFG) and fine grain (FG) conditions. The UFG MEA performs better than the FG MEA during cyclic loading. Microstructural evolution after cyclic loading via electron back-scattered diffraction shows microstructural stability of both FG and UFG microstructures. Transmission electron microscopy suggests formation of stacking faults and fine-scale HCP transformation during cyclic loading.
机译：疲劳是故障的主要原因，需要进行专门调查以验证潜在结构材料的完整性。随着高和中熵合金（HEA和MEA）受到科学界的广泛关注，在循环加载环境下测试这些新型合金的结构完整性非常重要。这项研究分析了新型中熵合金（MEA）CoCri.3Ni在超细晶粒（UFG）和细晶粒（FG）条件下的单调和循环载荷特性。在循环加载过程中，UFG MEA的性能优于FG MEA。通过电子背散射衍射的循环载荷后的微观结构演变表明FG和UFG微观结构的微观结构稳定性。透射电子显微镜表明在循环加载过程中会形成堆垛层错和精细的HCP转变。

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