Effects of the morphology of grain boundary α-phase on the anisotropic deformation behaviors of additive manufactured Ti–6Al–4V

Jianwen Liu; Kai Zhang; Xiang Gao; Hao Wang; Songquan Wu; Yi Yang; Yuman Zhu; Aijun Huang

Materials & Design (Nov 2022)

Effects of the morphology of grain boundary α-phase on the anisotropic deformation behaviors of additive manufactured Ti–6Al–4V

Jianwen Liu,
Kai Zhang,
Xiang Gao,
Hao Wang,
Songquan Wu,
Yi Yang,
Yuman Zhu,
Aijun Huang

Affiliations

Jianwen Liu: School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China
Kai Zhang: School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China; Monash Center for Additive Manufacturing (MCAM), Monash University, Notting Hill, VIC 3168, Australia; Department of Materials Science and Engineering, Monash University, Clayton, VIC 3800, Australia; Corresponding author at: School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China.
Xiang Gao: Monash Center for Additive Manufacturing (MCAM), Monash University, Notting Hill, VIC 3168, Australia; Department of Materials Science and Engineering, Monash University, Clayton, VIC 3800, Australia
Hao Wang: School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China
Songquan Wu: School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China
Yi Yang: School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China
Yuman Zhu: Monash Center for Additive Manufacturing (MCAM), Monash University, Notting Hill, VIC 3168, Australia; Department of Materials Science and Engineering, Monash University, Clayton, VIC 3800, Australia
Aijun Huang: Monash Center for Additive Manufacturing (MCAM), Monash University, Notting Hill, VIC 3168, Australia; Department of Materials Science and Engineering, Monash University, Clayton, VIC 3800, Australia

Journal volume & issue: Vol. 223
p. 111150

Abstract

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Grain boundary α-phase (GB-α) in titanium alloys is the vulnerable site for failure, while the correlation between deformation behavior and local dislocation motion is still ambiguous. In this study, we made a detailed investigation into the deformation behavior of GB-α with different morphologies in a laser powder bed fusion (LPBF) fabricated Ti-6Al-4V (Ti-64) by using in-situ and interrupted tensile testing, and discussed the underlying mechanisms of dislocation motion. The deformation-induced dislocations were found severely accumulated within the continuous GB-α with the transverse loading direction, which corresponds to the strain localization, while uniformly distributed between the continuous GB-α and surrounding grains with the perpendicular tensile loading. In contrast, discontinuous GB-α could fully accommodate uniform deformation with the matrix microstructure under both loading directions. The new understanding of dislocation motions in GB-α provides a novel perspective to effectively eliminate the tensile property anisotropy with the columnar microstructure present in LPBF Ti-64.

Published in Materials & Design

ISSN: 0264-1275 (Print); 1873-4197 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/materials-and-design

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