On the novel precipitation sequence of the TiN modified Al-Mn-Sc alloy processed by laser powder bed fusion

Hao Tang; Zhiyu Xiao; Chaofeng Gao; Zhiyuan Liu; Xiaoying Xi; Jiantao Zhang; Boshen Weng; Xingyi Li; Yunjie Bi; Jeremy Heng Rao

Journal of Materials Research and Technology (Nov 2024)

On the novel precipitation sequence of the TiN modified Al-Mn-Sc alloy processed by laser powder bed fusion

Hao Tang,
Zhiyu Xiao,
Chaofeng Gao,
Zhiyuan Liu,
Xiaoying Xi,
Jiantao Zhang,
Boshen Weng,
Xingyi Li,
Yunjie Bi,
Jeremy Heng Rao

Affiliations

Hao Tang: National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, South China University of Technology, Guangzhou, 510641, China
Zhiyu Xiao: National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, South China University of Technology, Guangzhou, 510641, China; Corresponding author.
Chaofeng Gao: Institute of Advanced Additive Manufacturing, Ji Hua Laboratory, Foshan, 528000, China
Zhiyuan Liu: Additive Manufacturing Institute, Shenzhen University, Shenzhen, 518060, China
Xiaoying Xi: National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, South China University of Technology, Guangzhou, 510641, China
Jiantao Zhang: National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, South China University of Technology, Guangzhou, 510641, China
Boshen Weng: National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, South China University of Technology, Guangzhou, 510641, China
Xingyi Li: National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, South China University of Technology, Guangzhou, 510641, China
Yunjie Bi: Institute of Advanced Additive Manufacturing, Ji Hua Laboratory, Foshan, 528000, China
Jeremy Heng Rao: Institute of Advanced Additive Manufacturing, Ji Hua Laboratory, Foshan, 528000, China; Corresponding author.

Journal volume & issue: Vol. 33
pp. 7788 – 7794

Abstract

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The influence of TiN addition on the new precipitation sequence and hardening effects of TiN modified Al-Mn-Sc alloy processed by LPBF was systematically studied in this work. The diffusion behavior of TiN particles results in obvious difference in the main alloying elements concentrations, altering the lattice constants of both primary and secondary L12-Al3(Ti,Sc,Zr) precipitates in the alloy matrix composite. After being subjected to peak-aging treatment, a novel precipitation sequence was observed in the sample containing 1.5 wt% TiN via generating a higher volume fraction of coherent L12-Al3Sc and semi-coherent rod-like Al6(Mn,Fe) precursors, corresponding to an alleviated internal strain as well. This new phenomenon has been demonstrated as a novel hardening mechanisms contributing to both microstructure refinement and mechanical property enhancement. As the results, the sample containing 1.5 wt% TiN exhibits an ultra-high yield strength of 651 ± 7 MPa and a compensate fracture elongation rate of 3.9 ± 0.3 %.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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