Al-Zn体系中纳米级过饱和固溶体的急剧硬化与形成

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

Materials Research Letters Pub Date : 2023-07-12 DOI:10.1080/21663831.2023.2233993

Yiming Zhong, Bo Zhang, Ling Fang, Junjie Chen, Wei Xu, X. Li

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引用次数: 0

摘要

剧烈塑性变形(SPD)细化晶粒可导致Al-Zn过饱和固溶体分解，导致应变软化而非硬化。迄今为止，通过SPD细化晶粒来提高二元Al-Zn合金的强度是非常具有挑战性的。通过低温高压扭转，在Al-21.7 at% Zn合金中成功生成了晶界松弛的单相过饱和固溶体纳米结构。而不是软化，实现了巨大的硬化。晶粒尺寸为15 nm的纳米晶Al-Zn合金具有高达642 MPa的超高屈服强度。通过低温高压扭转，在极高剪切应变下，对具有极细纳米晶粒和单相过饱和固溶体的Al-Zn合金进行了巨硬化。

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Giant hardening and formation of nanograined supersaturated solid solution in Al–Zn system

Grain refinement via severe plastic deformation (SPD) can induce the decomposition of Al–Zn supersaturated solid solution, resulting in strain softening rather than hardening. So far, it is very challenging to improve the strength of binary Al–Zn alloy by refining grains through SPD. Herein, a single-phase supersaturated solid solution nanostructure with relaxed grain boundaries has been successfully generated in Al–21.7 at% Zn alloy by cryogenic high-pressure torsion. Instead of softening, giant hardening is achieved. The nanocrystalline Al–Zn alloy with grain size of 15 nm has an ultrahigh yield strength of about 642 MPa. GRAPHICAL ABSTRACT IMPACT STATEMENT Giant hardening has been achieved in Al–Zn alloy with extremely fine nanograins and single-phased supersaturated solid solution under extremely high shear strain via cryogenic high-pressure torsion.

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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.