A Novel Strategy to Additively Manufacture 7075 Aluminium Alloy With Selective Laser Melting

34 Pages Posted: 27 Jan 2021

See all articles by Qiyang Tan

Qiyang Tan

University of Queensland - School of Mechanical and Mining Engineering

Zhiqi Fan

University of Queensland - School of Mechanical and Mining Engineering

Xiaoqin Tang

University of Queensland - School of Mechanical and Mining Engineering

Yu Yin

University of Queensland - School of Mechanical and Mining Engineering

Gan Li

Southern University of Science and Technology - Shenzhen Key Laboratory for Additive Manufacturing of High-Performance Materials; University of Queensland - School of Mechanical and Mining Engineering

Danni Huang

University of Queensland - School of Mechanical and Mining Engineering

Jingqi Zhang

University of Queensland - School of Mechanical and Mining Engineering

Yingang Liu

University of Queensland - School of Mechanical and Mining Engineering

Feng Wang

HBIS Group

Tao Wu

HBIS Group

Xianliang Yang

HBIS Group

Han Huang

University of Queensland - School of Mechanical and Mining Engineering

Qiang Zhu

Southern University of Science and Technology - Shenzhen Key Laboratory for Additive Manufacturing of High-Performance Materials

Ming-Xing Zhang

University of Queensland - School of Mechanical and Mining Engineering

Abstract

Selective laser melting (SLM) has been successful in fabricating advanced engineering parts with high geometrical complexities. However, some metals or alloys with high strength, low weldability, and large freezing range, such as 7075 aluminium alloy, have low AM processability and are hard to be directly SLM-fabricated. Here, we proposed a novel strategy, combining substrate modification and inoculation treatment, to fabricate a crack-free and dense high-strength 7075 alloy using SLM at a broad processing window. Inoculation of the 7075 alloy powder with 1 wt.% Ti submicron particles substantially refine the Al grains, effectively increasing the cracking resistance. Furthermore, the SLM substrate was modified, which allows integration of thermal insulation materials, such as vermiculite, to the substrate. As a result, the melt pool cooling rate and thermal gradient during solidification were significantly reduced. This directly led to a reduction in thermal stress within the melt pool. With combination of the substrate modification and Ti inoculation, crack-free, fine-equiaxed microstructure was obtained in the SLM-fabricated 7075 alloy that has the mechanical properties comparable to its wrought counterpart. This strategy can be implemented to SLM of other engineering alloys with low AM processability, providing a foundation for broadening industrial applications of SLM.

Keywords: Selective laser melting; Aluminum alloys; Grain refinement; TEM; FEM

Suggested Citation

Tan, Qiyang and Fan, Zhiqi and Tang, Xiaoqin and Yin, Yu and Li, Gan and Huang, Danni and Zhang, Jingqi and Liu, Yingang and Wang, Feng and Wu, Tao and Yang, Xianliang and Huang, Han and Zhu, Qiang and Zhang, Ming-Xing, A Novel Strategy to Additively Manufacture 7075 Aluminium Alloy With Selective Laser Melting. Available at SSRN: https://ssrn.com/abstract=3774509 or http://dx.doi.org/10.2139/ssrn.3774509

Qiyang Tan

University of Queensland - School of Mechanical and Mining Engineering

St Lucia
Brisbane, Queensland 4072
Australia

Zhiqi Fan

University of Queensland - School of Mechanical and Mining Engineering ( email )

Xiaoqin Tang

University of Queensland - School of Mechanical and Mining Engineering ( email )

St Lucia
Brisbane, 4072
Australia

Yu Yin

University of Queensland - School of Mechanical and Mining Engineering

St Lucia
Brisbane, Queensland 4072
Australia

Gan Li

Southern University of Science and Technology - Shenzhen Key Laboratory for Additive Manufacturing of High-Performance Materials

No 1088, xueyuan Rd.
Xili, Nanshan District
Shenzhen, Guangdong 518055
China

University of Queensland - School of Mechanical and Mining Engineering

St Lucia
Brisbane, Queensland 4072
Australia

Danni Huang

University of Queensland - School of Mechanical and Mining Engineering

St Lucia
Brisbane, Queensland 4072
Australia

Jingqi Zhang

University of Queensland - School of Mechanical and Mining Engineering ( email )

St Lucia
Brisbane, Queensland 4072
Australia

Yingang Liu

University of Queensland - School of Mechanical and Mining Engineering ( email )

St Lucia
Brisbane, Queensland 4072
Australia

Feng Wang

HBIS Group

China

Tao Wu

HBIS Group

China

Xianliang Yang

HBIS Group ( email )

China

Han Huang

University of Queensland - School of Mechanical and Mining Engineering ( email )

St Lucia
Brisbane, Queensland 4072
Australia

Qiang Zhu

Southern University of Science and Technology - Shenzhen Key Laboratory for Additive Manufacturing of High-Performance Materials ( email )

No 1088, xueyuan Rd.
Xili, Nanshan District
Shenzhen, Guangdong 518055
China

Ming-Xing Zhang (Contact Author)

University of Queensland - School of Mechanical and Mining Engineering ( email )

St Lucia
Brisbane, Queensland 4072
Australia

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