Abstract Tensile creep behavior of the CoCrNi medium entropy alloy in a temperature range of 973–1073 K was investigated in this study. According to the fitted stress exponent and activation energy, dislocation climb and lattice diffusion are proposed to be the dominated creep deformation mechanism for this alloy. During creep tests, the plate-like Cr-rich σ phase forms along the grain boundaries of the originally single-phase face-centered-cubic (FCC) CoCrNi alloy. It is suggested that low stacking-fault energy and local chemical ordering be responsible for the superior creep resistance and lifetime as opposed to that of the CoCrFeMnNi alloy.

中文翻译：

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等原子CoCrNi中熵合金的拉伸蠕变行为

摘要 本研究研究了 CoCrNi 中熵合金在 973-1073 K 温度范围内的拉伸蠕变行为。根据拟合的应力指数和活化能，提出位错爬升和晶格扩散是该合金的主要蠕变变形机制。在蠕变试验期间，板状富铬 σ 相沿最初单相面心立方 (FCC) CoCrNi 合金的晶界形成。与 CoCrFeMnNi 合金相比，低堆垛层错能和局部化学有序性是其优异的抗蠕变性和寿命的原因。