Hidden Effects of Negative Stacking Fault Energies in Complex Concentrated Alloys
Hidden Effects of Negative Stacking Fault Energies in Complex Concentrated Alloys
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DOI：
10.1103/physrevlett.126.255502
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发表时间：
2021-06-21
影响因子：
8.6
通讯作者：
Chen, Mingwei
中科院分区：
文献类型：
--
作者：
Pei, Zongrui;Dutta, Biswanath;Chen, Mingwei
负层错能（SFE）存在于面心立方高熵合金中，具有优异的力学性能，特别是在低温下。由于缺乏对纳米级变形的原位观察，它们的作用仍然难以捉摸。在这里，Shockley偏导数的多态性进行了充分的探讨，辅助一个新的方法。我们表明，负的超临界流体导致新的部分对，如果他们是在六方密堆积合金。在低温下，相关的屈服应力远高于其他机制。这概括了所有负SFE合金的物理图像。
Negative stacking fault energies (SFEs) are found in face-centered cubic high-entropy alloys with excellent mechanical properties, especially at low temperatures. Their roles remain elusive due to the lack of in situ observation of nanoscale deformation. Here, the polymorphism of Shockley partials is fully explored, assisted by a new method. We show negative SFEs result in novel partial pairs as if they were in hexagonal close-packed alloys. The associated yield stresses are much higher than those for other mechanisms at low temperatures. This generalizes the physical picture for all negative-SFE alloys.