Plastic deformations in NiCoFe medium-entropy alloy investigated using nanoindentation simulations

IF 4.4 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Results in Physics Pub Date : 2024-10-01 DOI:10.1016/j.rinp.2024.107989

Qinqin Xu , F. Javier Domı́nguez-Gutiérrez , Wenyi Huo , Stefanos Papanikolaou

引用次数: 0

Abstract

Medium-entropy alloys (MEA) have potential load-bearing applications as high-performance structural materials. In this work, the plastic deformations in NiCoFe MEAs were investigated using nanoindentation atomistic simulations. The nanoindentation responses of three typical orientations of NiCoFe single-crystals were investigated, i.e., [001], [011] and [111]. The results show that, during nanoindentation, Shockley partials on (111) slip planes remarkably affect dislocation-related activities including nucleation, gliding, and interactions. The form of atomic pile-ups is highly non-uniform and strongly asymmetrical due to the presence of multi-principal elements. The dislocation nucleation mechanism of the alloys during nanoindentation is proposed in detail. We find evidence that a hexagonal close-packed phase is formed from the face-centered cubic structure during nanoindentation.

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利用纳米压痕模拟研究镍钴铁中熵合金的塑性变形

中熵合金（MEA）作为高性能结构材料具有潜在的承载应用。本研究利用纳米压痕原子模拟研究了镍钴铁合金的塑性变形。研究了镍钴铁单晶的三种典型取向（即[001]、[011]和[111]）的纳米压痕响应。结果表明，在纳米压痕过程中，(111) 滑移面上的肖克利偏置会显著影响差排的相关活动，包括成核、滑行和相互作用。由于多主元素的存在，原子堆积的形式高度不均匀且极不对称。我们详细提出了合金在纳米压痕过程中的位错成核机制。我们发现有证据表明，在纳米压痕过程中，面心立方结构形成了六方紧密堆积相。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Results in Physics MATERIALS SCIENCE, MULTIDISCIPLINARYPHYSIC-PHYSICS, MULTIDISCIPLINARY

CiteScore

8.70

自引率

9.40%

发文量

754

审稿时长

50 days

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