Martensite colony engineering: A novel solution to realize the high ductility in full martensitic 3D-printed Ti alloys

Zhifu Yao; Tao Yang; Mujin Yang; Xue Jia; Chenglei Wang; Jinxin Yu; Zhou Li; Heyu Han; Weihong Liu; Guoqiang Xie; Shuiyuan Yang; Qian Zhang; Cuiping Wang; Shuai Wang; Xingjun Liu

Materials & Design (Mar 2022)

Martensite colony engineering: A novel solution to realize the high ductility in full martensitic 3D-printed Ti alloys

Zhifu Yao,
Tao Yang,
Mujin Yang,
Xue Jia,
Chenglei Wang,
Jinxin Yu,
Zhou Li,
Heyu Han,
Weihong Liu,
Guoqiang Xie,
Shuiyuan Yang,
Qian Zhang,
Cuiping Wang,
Shuai Wang,
Xingjun Liu

Affiliations

Zhifu Yao: State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, 518055 Shenzhen, PR China; Institute of Materials Genome & Big Data, Harbin Institute of Technology, 518055 Shenzhen, PR China; Department of Materials Science and Engineering, Harbin Institute of Technology, 518055 Shenzhen, PR of China
Tao Yang: Department of Material Science and Engineering, College of Engineering, City University of Hong Kong, Hong Kong, China
Mujin Yang: Institute of Materials Genome & Big Data, Harbin Institute of Technology, 518055 Shenzhen, PR China; Department of Materials Science and Engineering, Harbin Institute of Technology, 518055 Shenzhen, PR of China
Xue Jia: Institute of Materials Genome & Big Data, Harbin Institute of Technology, 518055 Shenzhen, PR China; Department of Materials Science and Engineering, Harbin Institute of Technology, 518055 Shenzhen, PR of China
Chenglei Wang: Institute of Materials Genome & Big Data, Harbin Institute of Technology, 518055 Shenzhen, PR China; Department of Materials Science and Engineering, Harbin Institute of Technology, 518055 Shenzhen, PR of China
Jinxin Yu: College of Materials and Fujian Provincial Key Laboratory of Materials Genome (Xiamen University), Xiamen, Fujian 361000, PR China
Zhou Li: Institute of Materials Genome & Big Data, Harbin Institute of Technology, 518055 Shenzhen, PR China; Department of Materials Science and Engineering, Harbin Institute of Technology, 518055 Shenzhen, PR of China
Heyu Han: Institute of Materials Genome & Big Data, Harbin Institute of Technology, 518055 Shenzhen, PR China; Department of Materials Science and Engineering, Harbin Institute of Technology, 518055 Shenzhen, PR of China
Weihong Liu: Institute of Materials Genome & Big Data, Harbin Institute of Technology, 518055 Shenzhen, PR China; Department of Materials Science and Engineering, Harbin Institute of Technology, 518055 Shenzhen, PR of China
Guoqiang Xie: Institute of Materials Genome & Big Data, Harbin Institute of Technology, 518055 Shenzhen, PR China; Department of Materials Science and Engineering, Harbin Institute of Technology, 518055 Shenzhen, PR of China
Shuiyuan Yang: College of Materials and Fujian Provincial Key Laboratory of Materials Genome (Xiamen University), Xiamen, Fujian 361000, PR China
Qian Zhang: Institute of Materials Genome & Big Data, Harbin Institute of Technology, 518055 Shenzhen, PR China; Department of Materials Science and Engineering, Harbin Institute of Technology, 518055 Shenzhen, PR of China
Cuiping Wang: College of Materials and Fujian Provincial Key Laboratory of Materials Genome (Xiamen University), Xiamen, Fujian 361000, PR China; Corresponding authors at: State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, 518055 Shenzhen, People’s Republic of China (X. Liu).
Shuai Wang: Department of Mechanical and Energy Engineering, Southern University of Science and Technology, 1088 Xueyuan Blvd, Shenzhen 518055, PR China; Corresponding authors at: State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, 518055 Shenzhen, People’s Republic of China (X. Liu).
Xingjun Liu: State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, 518055 Shenzhen, PR China; Institute of Materials Genome & Big Data, Harbin Institute of Technology, 518055 Shenzhen, PR China; Department of Materials Science and Engineering, Harbin Institute of Technology, 518055 Shenzhen, PR of China; Shenzhen R&D Center for Al-based Hydrogen Hydrolysis Materials, Shenzhen 518055, PR China; Corresponding authors at: State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, 518055 Shenzhen, People’s Republic of China (X. Liu).

Journal volume & issue: Vol. 215
p. 110445

Abstract

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Generally, additively manufactured (AM) full martensitic titanium alloys (hexagonal-close-packed α’ phase) exhibits high yield strength (>1GPa) but poor elongation to failure (<8% usually). However, this only α’-phase microstructure is not intrinsically brittle and exhibits high ductility under certain process conditions. Therefore, it is crucial to unravel the mechanism of ductility fluctuation for process control. Here, we found the less martensite-colony microstructures (LMCM) could effectively distribute stress to variant interfaces and avoid strain localization. Therefore, it results in a 194% ductility enhancement in the AM-produced α’-Ti-6Al-4 V (Ti64) compared with the rich martensite-colony microstructure (MCM). At the same time, we also successfully improved the strength-ductility dilemma for Ti64 alloy (yield strength, Ys0.2 = 1044 ± 10 MPa, elongation at break, EL = 15 ± 1.5%). We attribute the LMCM to refined prior-β grain and a weak variant selection during βBCC to α’HCP by increasing hatch spacing. What’s more, to rule out the possible influence of the β phase and demonstrate the generality of our conclusion, we further apply it on α-titanium alloy (Ti-6.5Al-2Zr-1Mo-1 V, TA15 alloy) and obtain the same results.

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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