Role of microscopic degrees of freedom in mechanical response of bicrystal nanopillars

IF 8.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Letters Pub Date : 2023-09-06 DOI:10.1080/21663831.2023.2252885

Avanish Mishra, K. Dang, Edward M. Kober, S. Fensin, Nithin Mathew

引用次数: 0

Abstract

This study investigated the high-strain rate deformation of bicrystal Cu nanopillars, using atomistic simulations. Nanopillars with minimum grain boundary energy were deformed to investigate the role of macroscopic degrees of freedom, finding that geometric parameters (Schmid factor) influence the stress–strain response. The deformation of metastable grain boundaries (GBs) revealed that in addition to geometric parameters, the response was also governed by the local atomic arrangement at the boundary, dictating the dislocation-GB interactions. These findings shed light on the response of nanopillars as a function of GBs and show the importance of both macroscopic and microscopic degrees of freedom on the mechanical response. GRAPHICAL ABSTRACT IMPACT STATEMENT Metastable states, an often ignored aspect of GB structure, is shown to have a strong influence on dislocation-GB interactions; shedding new light on mechanical response of realistic GBs.

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微观自由度在双晶纳米柱力学响应中的作用

本研究采用原子模拟的方法研究了双晶铜纳米柱的高应变速率变形。对晶界能最小的纳米柱进行变形，研究宏观自由度对其应力应变响应的影响，发现几何参数(施密德因子)对其应力应变响应有影响。亚稳晶界(gb)的变形表明，除了几何参数外，响应还受边界上局部原子排列的控制，这决定了位错- gb相互作用。这些发现揭示了纳米柱作为GBs的函数的响应，并显示了宏观和微观自由度对力学响应的重要性。亚稳态，一个经常被忽略的GB结构方面，被证明对位错-GB相互作用有很强的影响;对真实gb的力学响应有了新的认识。

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

Materials Research Letters Materials Science-General Materials Science

CiteScore

12.10

自引率

3.60%

发文量

审稿时长

3.3 months

期刊介绍： Materials Research Letters is a high impact, open access journal that focuses on the engineering and technology of materials, materials physics and chemistry, and novel and emergent materials. It supports the materials research community by publishing original and compelling research work. The journal provides fast communications on cutting-edge materials research findings, with a primary focus on advanced metallic materials and physical metallurgy. It also considers other materials such as intermetallics, ceramics, and nanocomposites. Materials Research Letters publishes papers with significant breakthroughs in materials science, including research on unprecedented mechanical and functional properties, mechanisms for processing and formation of novel microstructures (including nanostructures, heterostructures, and hierarchical structures), and the mechanisms, physics, and chemistry responsible for the observed mechanical and functional behaviors of advanced materials. The journal accepts original research articles, original letters, perspective pieces presenting provocative and visionary opinions and views, and brief overviews of critical issues.