Microstructure and mechanical properties evolution of Al−Mg−Sc−Zr alloy fabricated by laser powder bed fusion

Xiang LI, Zheng-jiang GAO, Yun-zhong LIU

doi:10.1016/S1003-6326(25)66968-8

Transactions of Nonferrous Metals Society of China >

2026 , Vol. 36 >Issue 2: 337 - 354

DOI: https://doi.org/10.1016/S1003-6326(25)66968-8

MATERIALS SCIENCE AND ENGINEERING

Microstructure and mechanical properties evolution of Al−Mg−Sc−Zr alloy fabricated by laser powder bed fusion

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^a Guangdong Provincial Key Laboratory for Processing and Forming of Advanced Metallic Materials, South China University of Technology, Guangzhou 510640, China;

^b National Engineering Research Center of Near-net-shape Forming for Metallic Materials, South China University of Technology, Guangzhou 510640, China;

^c Key Laboratory of Advanced Functional Materials, Ministry of Education, Beijing University of Technology, Beijing 100124, China

Online published: 2026-04-01

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Abstract

The densification characterization, phase constitution, precipitation evolution and mechanical performance of Al−Mg−Sc−Zr alloy processed by laser powder bed fusion (LPBF) were systematically investigated. Moreover, the evolution of phase constitution and precipitation behavior after heat treatment were characterized by using X-ray diffraction (XRD) and transmission electron microscope (TEM) analysis. The ultimate tensile strength (UTS) of as-built samples ranged from 396.8 to 414.6 MPa as the scanning speed decreased from 1600 to 1000 mm/s. After post heat treatment, the yield strength (YS) increased to (513.1±1.3) MPa, while the UTS increased from (414.6±5.1) to (539.2±1.5) MPa. The significant improvement of mechanical performance was ascribed to the formation of secondary Al₃(Sc,Zr) precipitates.

Key words： additive manufacturing; laser powder bed fusion; Al?Mg?Sc?Zr; precipitation behavior; microstructure; mechanical performance

Cite this article

Xiang LI, Zheng-jiang GAO, Yun-zhong LIU . Microstructure and mechanical properties evolution of Al−Mg−Sc−Zr alloy fabricated by laser powder bed fusion[J]. Transactions of Nonferrous Metals Society of China, 2026 , 36(2) : 337 -354 . DOI: 10.1016/S1003-6326(25)66968-8

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