We applied Simmons-Balluffi methods, positron measurements, and neutron diffraction to estimate the vacancy of CoCrFeNi and CoCrFeMnNi high-entropy alloys (HEAs) using Cu as a benchmark. The corresponding formation enthalpies and associated entropies of the HEAs and Cu were calculated. The vacancy-dependent effective free volumes in both CoCrFeNi and CoCrFeMnNi alloys are greater than those in Cu, implying the easier formation of vacancies by lattice structure relaxation of HEAs at elevated temperatures. Spatially resolved synchrotron X-ray measurements revealed different characteristics of CoCrFeNi and CoCrFeMnNi HEAs subjected to quasi-equilibrium conditions at high temperatures. Element-dependent behavior revealed by X-ray fluorescence (XRF) mapping indicates the effect of Mn on the Cantor Alloy.

译文

我们应用Simmons-Balluffi方法,正电子测量和中子衍射来估计以Cu为基准的CoCrFeNi和CoCrFeMnNi高熵合金 (HEAs) 的空位。计算了hea和Cu的相应形成焓和相关熵。CoCrFeNi和CoCrFeMnNi合金中的空位依赖性有效自由体积均大于Cu中的空位,这意味着在高温下hea的晶格结构弛豫更容易形成空位。空间分辨的同步加速器x射线测量揭示了CoCrFeNi和CoCrFeMnNi hea在高温下处于准平衡条件下的不同特性。X射线荧光 (XRF) 映射揭示的元素依赖性行为表明Mn对Cantor合金的影响。

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