Revealing the mechanical behavior of homogeneous dislocation cell units in high-entropy alloy

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

Materials Research Letters Pub Date : 2023-09-19 DOI:10.1080/21663831.2023.2256359

Liangxue Zhang, Qingsong Pan, Lei Lu

引用次数: 0

Abstract

Gradient dislocation cell structured Al0.1CoCrFeNi high-entropy alloys exhibited exceptional strength and uniform ductility. HEA containing homogeneous dislocation cells, with the average size varying from 0.29 to 0.43 μm was observed to still exhibit a superior combination of high strength and good uniform elongation, distinct from traditional strong ultrafine-grained structures with limited ductility. This is because the initial dislocation cells tend to be progressively patterned into dense dislocation walls upon straining, associated with the massive dislocation motion and accumulation. The gradient-induced additional strain hardening behavior was clarified by directly comparing the mechanical behavior of the homogeneous and gradient samples.

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揭示高熵合金中均相位错胞单元的力学行为

梯度位错胞结构的Al0.1CoCrFeNi高熵合金表现出优异的强度和均匀的塑性。平均尺寸在0.29 ~ 0.43 μm之间的均匀位错胞，与传统的强超细晶组织相比，仍然具有优异的高强度和均匀伸长率。这是因为最初的位错细胞在拉伸时趋向于逐渐形成密集的位错壁，与大量的位错运动和积累有关。通过直接比较均匀和梯度试样的力学行为，明确了梯度诱导的附加应变硬化行为。

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.