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Microstructural evolution and mechanical properties of an ultrahigh-strength Al−Zn−Mg−Cu alloy via powder metallurgy and hot extrusion

粉末冶金-热挤压制备超高强度 Al−Zn−Mg−Cu 合金的组织及力学性能

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Abstract

In this work, a novel ultrahigh-strength Al−10Zn−3.5Mg−1.5Cu alloy was fabricated by powder metallurgy followed by hot extrusion. Investigations on microstructural evolution and mechanical properties of the fabricated samples were carried out. The results show that the grain size of sintered samples matches with the powder particles after ball milling. The relative densities of sintered and hot extruded samples reach 99.1% and 100%, respectively. Owing to the comprehensive mechanism of grain refinement, aging and dispersion strengthening, the ultimate tensile strength, yield strength and elongation of the Al−10Zn−3.5Mg−1.5Cu alloy after hot extrusion and subsequent heat treatment achieve 810 MPa, 770 MPa and 8%, respectively.

摘要

本文采用粉末冶金联合热挤压工艺制备了一种新型超高强度 Al−10Zn−3.5Mg−1.5Cu 合金,并对 其组织演变和力学性能进行了研究。结果表明: 烧结样品的晶粒尺寸与球磨粉末颗粒的尺寸相一致。 烧结和热挤压样品的相对密度分别达到99.1%和100%。通过晶粒细化、 时效强化和弥散强化的综合 作用机制, Al−10Zn−3.5Mg-1.5Cu 合金经热挤压和热处理后, 极限抗拉强度达到 810 MPa, 屈服强度达 到770 MPa, 断后伸长率达到 8%。

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Author notes

  1. CHEN Cun-guang and HAN Wei-hao contributed equally to this work.

Authors and Affiliations

  1. Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China

    Cun-guang Chen  (陈存广), Wei-hao Han  (韩未豪), Miao Qi  (祁妙), Shi-peng Dong  (董诗鹏), Pei Li  (李沛), Fang Yang  (杨芳), Jun-jie Hao  (郝俊杰) & Zhi-meng Guo  (郭志猛)

  2. Innovation Group of Marine Engineering Materials and Corrosion Control, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 519000, China

    Cun-guang Chen  (陈存广), Fang Yang  (杨芳), Jun-jie Hao  (郝俊杰) & Zhi-meng Guo  (郭志猛)

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  1. Cun-guang Chen  (陈存广)
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Contributions

CHEN Cun-guang and HAN Wei-hao conducted the literature review and wrote the draft of the manuscript. QI Miao, DONG Shi-peng and LI Pei analyzed the measured data. YANG Fang and HAO Jun-jie edited the draft of manuscript. GUO Zhi-meng provided the concept. All authors replied to reviewers’ comments and revised the final version.

Corresponding author

Correspondence to Cun-guang Chen  (陈存广).

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Conflict of interest

CHEN Cun-guang, HAN Wei-hao, QI Miao, DONG Shi-peng, LI Pei, YANG Fang, HAO Jun-jie and GUO Zhi-meng declare that they have no conflict of interest.

Foundation item: Project (FRF-GF-19-012AZ) supported by the Fundamental Research Funds for the Central Universities, China

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Chen, Cg., Han, Wh., Qi, M. et al. Microstructural evolution and mechanical properties of an ultrahigh-strength Al−Zn−Mg−Cu alloy via powder metallurgy and hot extrusion. J. Cent. South Univ. 28, 1195–1205 (2021). https://doi.org/10.1007/s11771-021-4669-y

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