Enhanced strength-ductility synergy in ultrafine-grained eutectic high-entropy alloys by inheriting microstructural lamellae.,Nature Communications

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Enhanced strength-ductility synergy in ultrafine-grained eutectic high-entropy alloys by inheriting microstructural lamellae.
Nature Communications ( IF 14.7 ) Pub Date : 2019-01-30 , DOI: 10.1038/s41467-019-08460-2
Peijian Shi ₁ , Weili Ren ₁ , Tianxiang Zheng ₁ , Zhongming Ren ₁ , Xueling Hou ₂ , Jianchao Peng ₂ , Pengfei Hu ₂ , Yanfei Gao ₃ , Yunbo Zhong ₁ , Peter K Liaw ₃

Affiliation

Realizing improved strength-ductility synergy in eutectic alloys acting as in situ composite materials remains a challenge in conventional eutectic systems, which is why eutectic high-entropy alloys (EHEAs), a newly-emerging multi-principal-element eutectic category, may offer wider in situ composite possibilities. Here, we use an AlCoCrFeNi2.1 EHEA to engineer an ultrafine-grained duplex microstructure that deliberately inherits its composite lamellar nature by tailored thermo-mechanical processing to achieve property combinations which are not accessible to previously-reported reinforcement methodologies. The as-prepared samples exhibit hierarchically-structural heterogeneity due to phase decomposition, and the improved mechanical response during deformation is attributed to both a two-hierarchical constraint effect and a self-generated microcrack-arresting mechanism. This work provides a pathway for strengthening eutectic alloys and widens the design toolbox for high-performance materials based upon EHEAs.

中文翻译：

通过继承微结构薄层，增强了超细晶共晶高熵合金的强度-延展性协同作用。

在用作常规共晶体系的共晶合金中实现改善的强度-延展性协同作用仍然是常规共晶体系中的一个挑战，这就是为什么新兴的多原理元共晶类别的共晶高熵合金（EHEAs）可以提供更广泛的用途的原因原位复合的可能性。在这里，我们使用AlCoCrFeNi2.1 EHEA设计超细晶粒的双相微结构，该微结构通过定制的热机械加工故意继承了其复合层状性质，以实现以前报告的加固方法无法获得的性能组合。制备的样品由于相分解而显示出层次结构的异质性，变形过程中改善的机械响应归因于两个层次的约束效应和自生的微裂纹阻止机制。这项工作为强化共晶合金提供了途径，并拓宽了基于EHEA的高性能材料设计工具箱。

更新日期：2019-01-30

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