CALPHAD aided design of a crack-free Al-Mg-Si-Ti alloy with high strength: heterogeneous nucleation and eutectic filling during additive manufacturing

Tao Wen; Zhicheng Li; Jianying Wang; Feipeng Yang; Mengzhen Zhu; Yimou Luo; Lijun Zhang; Zhilin Liu; Dong Qiu; Hailin Yang; Shouxun Ji

doi:10.1080/17452759.2024.2378930

Virtual and Physical Prototyping (Dec 2024)

CALPHAD aided design of a crack-free Al-Mg-Si-Ti alloy with high strength: heterogeneous nucleation and eutectic filling during additive manufacturing

Tao Wen,
Zhicheng Li,
Jianying Wang,
Feipeng Yang,
Mengzhen Zhu,
Yimou Luo,
Lijun Zhang,
Zhilin Liu,
Dong Qiu,
Hailin Yang,
Shouxun Ji

Affiliations

Tao Wen: State Key Laboratory of Powder Metallurgy, Central South University, Changsha, People’s Republic of China
Zhicheng Li: State Key Laboratory of Powder Metallurgy, Central South University, Changsha, People’s Republic of China
Jianying Wang: State Key Laboratory of Powder Metallurgy, Central South University, Changsha, People’s Republic of China
Feipeng Yang: State Key Laboratory of Powder Metallurgy, Central South University, Changsha, People’s Republic of China
Mengzhen Zhu: State Key Laboratory of Powder Metallurgy, Central South University, Changsha, People’s Republic of China
Yimou Luo: State Key Laboratory of Powder Metallurgy, Central South University, Changsha, People’s Republic of China
Lijun Zhang: State Key Laboratory of Powder Metallurgy, Central South University, Changsha, People’s Republic of China
Zhilin Liu: Light Alloy Research Institute, College of Mechanical and Electrical Engineering, Central South University, Changsha, People’s Republic of China
Dong Qiu: Centre for Additive Manufacturing, School of Engineering, RMIT University, Melbourne, Australia
Hailin Yang: State Key Laboratory of Powder Metallurgy, Central South University, Changsha, People’s Republic of China
Shouxun Ji: Brunel Centre for Advanced Solidification Technology (BCAST), Brunel University London, Uxbridge, Middlesex, UK

DOI: https://doi.org/10.1080/17452759.2024.2378930
Journal volume & issue: Vol. 19, no. 1

Abstract

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The CALPHAD (calculation of phase diagrams) method was applied to facilitate the design of a crack-free Al-Mg-Si-Ti alloy fabricated by laser-powder bed fusion (L-PBF). Calculation and alloy characterisation show that Ti addition at 0.77 wt.% can offer a synergic effect of increasing the heterogeneous nucleation rate and the growth restriction factor (Q) in the initial solidification stage. Meanwhile, the increase of Mg/Si ratio can promote the formation of Al/Mg2Si eutectics to provide excellent backfilling ability in the final solidification stage. As a result, the experimental Al-Mg-Si-Ti alloy significantly improve the crack susceptibility. Also, the Al-Mg-Si-Ti alloy with dislocation interaction of Al/Mg2Si eutectics and Al3Ti particles show an excellent ultimate tensile strength of 447.8 MPa and elongation of 9.1% under as-LPBFed condition.

Published in Virtual and Physical Prototyping

ISSN: 1745-2759 (Print); 1745-2767 (Online)
Publisher: Taylor & Francis Group
Country of publisher: United Kingdom
LCC subjects: Science; Technology: Manufactures
Website: https://www.tandfonline.com/nvpp

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