Developing high-strength and ductile Mg-Gd-Y-Zn-Zr alloy sheet via bimodal grain structure coupling with heterogeneously-distributed precipitates

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

Materials Research Letters Pub Date : 2023-07-14 DOI:10.1080/21663831.2023.2235375

M. Zha, Si-Qing Wang, Tong Wang, Hailong Jia, Ya-wei Li, Zhen-Ming Hua, K. Guan, Cheng Wang, Hong Wang

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引用次数: 1

Abstract

ABSTRACT Achieving high strength-ductility synergy in hard-to-deform high-alloyed Mg-Gd-Y-Zn-Zr alloys by rolling remains a great challenge. In this work, a Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr (wt.%) alloy sheet possessing a high yield strength (YS) of ∼385 MPa, ultimate tensile strength (UTS) of ∼420 MPa and elongation of ∼19% was achieved via a single-pass hard-plate rolling (HPR) process. The high YS is mainly from amounts of submicron FGs and strong interactions between densely distributed γ′ precipitates and pyramidal dislocations in CGs. The activation of multiple slip systems, HDI-hardening effect, and crack suppression effect from γ′ particles, endow the excellent ductility. GRAPHICAL ABSTRACT IMPACT STATEMENT The hard-to-deform WE94 alloy sheet exhibiting a superior strength-ductility synergy has been prepared by a single-pass HPR process. The bimodal grain structure containing substantial ultrafine grains coupling with inhomogeneously-distributed nano-scale precipitates accounts for the superior mechanical properties.

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通过双峰晶型组织与非均匀分布的析出相耦合，制备高强度、高韧性的Mg-Gd-Y-Zn-Zr合金板材

摘要通过轧制在难变形的高合金化Mg-Gd-Y-Zn-Zr合金中实现高强度-延性协同作用仍然是一个巨大的挑战。在这项工作中，Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr（wt.%）合金板具有～385的高屈服强度（YS） MPa，极限抗拉强度（UTS）为~420 MPa，延伸率～19%是通过单程硬质板材轧制（HPR）工艺实现的。高YS主要来自于亚微米FGs的数量以及CGs中密集分布的γ′沉淀和金字塔位错之间的强相互作用。多重滑移系统的激活、HDI硬化效应和γ′颗粒的裂纹抑制效应赋予了优异的延展性。图形摘要冲击声明通过单程HPR工艺制备了具有优异强度-延展性协同作用的难变形WE94合金板。包含大量超细晶粒的双峰晶粒结构与不均匀分布的纳米级沉淀物耦合，导致了优异的机械性能。

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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.