Activation of different twinning mechanisms and their contributions to mechanical behavior of a face-centered cubic Co-based high-entropy alloy

IF 8.3 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Acta Materialia Pub Date : 2024-12-17 DOI:10.1016/j.actamat.2024.120665
Mehrdad Ghiasabadi Farahani, Mohammadhossein Barati Rizi, Mahdi Aghaahmadi, Joo-Hee Kang, Sakari Pallaspuro, Leo Pentti Karjalainen, Jeoung Han Kim
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Abstract

The microstructural evolution of a Co-based high-entropy alloy (HEA) was examined using electron microscopies, confirming the prominent presence of stacking faults (SFs) and deformation twins during compression. A novel twinning mechanism involving a local fcc → hcp transformation at the medium deformation stage was discovered, which had not been hitherto reported in HEAs. High-resolution scanning transmission electron microscopy revealed the conversion of a pre-twinned ε-martensite-like phase, featuring a local hcp structure, into a stable three-layer twin lamella through the nucleation of new SFs in between pre-existing ones. Additionally, as deformation progressed, the Niewzcas and Saada's pole mechanism of twinning was simultaneously activated, resulting in the formation of nano-twins within the HEA structure at higher deformation stages. The activation of both twinning mechanisms was analyzed by considering the concept of effective stacking fault energy, and stacking fault and twin fault probabilities, calculated through X-ray diffraction analysis at each deformation stage. Finally, the activation energy associated with dislocation-SFs and twin boundary interactions, as well as their respective influences on the strain-hardening behavior of the HEA at each deformation stage, were thoroughly investigated using thermally activated parameters obtained from cyclic stress relaxation experiments.

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激活不同孪晶机制及其对面心立方钴基高熵合金力学行为的影响
利用电子显微镜研究了一种钴基高熵合金(HEA)的微观结构演变,证实了在压缩过程中堆叠断层(SF)和变形孪晶的显著存在。研究还发现了一种新的孪生机制,即在中等变形阶段发生局部 fcc → hcp 转变,这是迄今为止在 HEA 中从未报道过的。高分辨率扫描透射电子显微镜显示,具有局部 hcp 结构的预孪晶ε-马氏体样相通过在原有孪晶ε-马氏体样相之间的新 SF 形核转化为稳定的三层孪晶薄片。此外,随着变形的进行,Niewzcas 和 Saada 的极点孪晶机制也同时被激活,从而在较高的变形阶段在 HEA 结构中形成了纳米孪晶。在每个变形阶段,通过 X 射线衍射分析计算出的有效堆积断层能、堆积断层概率和孪生断层概率的概念,对这两种孪生机制的激活进行了分析。最后,利用循环应力松弛实验获得的热激活参数,深入研究了与位错-SFs 和孪生边界相互作用相关的激活能,以及它们各自对 HEA 在每个变形阶段的应变硬化行为的影响。
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来源期刊
Acta Materialia
Acta Materialia 工程技术-材料科学:综合
CiteScore
16.10
自引率
8.50%
发文量
801
审稿时长
53 days
期刊介绍: Acta Materialia serves as a platform for publishing full-length, original papers and commissioned overviews that contribute to a profound understanding of the correlation between the processing, structure, and properties of inorganic materials. The journal seeks papers with high impact potential or those that significantly propel the field forward. The scope includes the atomic and molecular arrangements, chemical and electronic structures, and microstructure of materials, focusing on their mechanical or functional behavior across all length scales, including nanostructures.
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