Correlative chemical and structural investigations of accelerated phase evolution in a nanocrystalline high entropy alloy
Correlative chemical and structural investigations of accelerated phase evolution in a nanocrystalline high entropy alloy
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DOI：
10.1016/j.scriptamat.2020.03.016
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发表时间：
2020-07
影响因子：
6
通讯作者：
Y. J. Li;A. Kostka;A. Savan;A. Ludwig
中科院分区：
文献类型：
--
作者：
Y. J. Li;A. Kostka;A. Savan;A. Ludwig
基于我们最近开发的组合处理平台，在多元合金相演化的加速调查，提出了一种新的相关原子探针断层扫描和透射电子显微镜的方法来研究相稳定性在纳米晶CrMnFeCoNi合金。我们观察到，材料可以在250°C下分解5小时或300°C下分解1小时，在500°C下退火500天后，具有与其粗晶对应物相同的分解产物。一个低的表观活化能的Ni在纳米晶合金中的扩散推导和解释的快速相分解的动力学在纳米晶合金。
Based on our recently-developed combinatorial processing platforms for accelerated investigations of phase evolution in multinary alloys, a novel correlative atom probe tomography and transmission electron microscopy approach is proposed to study phase stability in a nanocrystalline CrMnFeCoNi alloy. We observed that the material can decompose at 250°C for 5 h or 300°C for 1 h, having the same decomposed products as in its coarse-grained counterpart after annealing at 500°C for 500 days. A low apparent activation energy for the diffusion of Ni in the nanocrystalline alloy is derived and explains the fast kinetics of phase decomposition in nanocrystalline alloys.