Microstructure evolution and tensile deformation behavior of an ultrahigh-strength Al-Mg-Mn-Sc-Zr alloy fabricated by laser powder bed fusion

Jun Wang, Fencheng Liu, Xiaobin Yu, Fenggang Liu, Wugui Jiang, Zihong Wang, Chunping Huang, Xin Lin

科研成果: 期刊稿件文章同行评审

1 引用 (Scopus)

摘要

In recent years, it has been proved to be an effective strategy to obtain high strength and ultrahigh-strength Al alloys by laser powder bed fusion (LPBF). However, these ultrahigh-strength LPBFed Al alloys are difficult to achieve good ductility. In this work, high content of Sc/Zr modified Al-Mg-Mn-Sc-Zr alloy was prepared by LPBF. The high content of Sc/Zr brought unique heterogeneous microstructure and further affected the tensile deformation behavior of the alloy. It was found that the precipitation of primary Al3(Sc,Zr) phase significantly increased the number of nucleation sites at the front of the liquid-solid interface and promoted the columnar-to-equiaxed transition (CET), leading to a microstructure of near-full equiaxed grains with a grain size range from 0.55 μm to 1.10 μm. Tensile tests showed that the yield strength of the as-built sample was 442 MPa, and the strengthening effect brought by ultrafine grains plays a leading role, which is difficult to achieve for the Al-Mg-Mn-Sc-Zr alloy with low Sc/Zr content. After aging treatment, the yield strength of the LPBFed Al-Mg-Mn-Sc-Zr alloy reached up to 613 ± 5 MPa under the combined effects of grain-boundary strengthening and precipitation strengthening. The decrease of work-hardening capacity induced a longer Lüders elongation after aging, but the reliable dislocation accumulation ability of coarse grains still existed, which finally made the elongation of the as-aged sample reach 11.7 ± 0.5 %.

源语言英语
文章编号114216
期刊Vacuum
238
DOI
出版状态已出版 - 8月 2025

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