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

Yao, Zhifu1,2,3; Yang, Tao4; Yang, Mujin2,3; Jia, Xue2,3; Wang, Chenglei2,3; Yu, Jinxin5; Li, Zhou2,3; Han, Heyu2,3; Liu, Weihong2,3; Xie, Guoqiang2,3; Yang, Shuiyuan5; Zhang, Qian2,3; Wang, Cuiping5; Wang, Shuai6; Liu, Xingjun1,2,3,7

2022-03-01

10.1016/j.matdes.2022.110445

MATERIALS & DESIGN   影响因子和分区

0264-1275

1873-4197

Generally, additively manufactured (AM) full martensitic titanium alloys (hexagonal-close-packed a' phase) exhibits high yield strength (>1GPa) but poor elongation to failure (<8% usually). However, this only a'-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 a'-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-13 grain and a weak variant selection during 13BCC to a'HCP by increasing hatch spacing. What's more, to rule out the possible influence of the 13 phase and demonstrate the generality of our conclusion, we further apply it on a-titanium alloy (Ti-6.5Al-2Zr-1Mo-1 V, TA15 alloy) and obtain the same results. (c) 2022 Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http:// creativecommons.org/licenses/by-nc-nd/4.0/).

3D printing Titanium alloys Ductility Dislocation

SCI ; EI

英语

通讯

Key-area Research and Development Program of Guang Dong Province[2019B010943001] ; MajorSpecial Science and Technology Project in Shandong Province[2019JZZY010303] ; National Post-doctoral Program for Innovative Talents[BX20200103]

Materials Science

Materials Science, Multidisciplinary

WOS:000761249400002

ELSEVIER SCI LTD

20220711618769

Ductility ; Martensite ; Microstructure ; Titanium alloys ; Yield stress

Metallography:531.2 ; Titanium and Alloys:542.3 ; Printing Equipment:745.1.1 ; Materials Science:951

MATERIALS SCIENCE

Web of Science

1.Harbin Inst Technol, State Key Lab Adv Welding & Joining, Shenzhen 518055, Peoples R China
2.Harbin Inst Technol, Inst Mat Genome & Big Data, Shenzhen 518055, Peoples R China
3.Harbin Inst Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China
4.City Univ Hong Kong, Coll Engn, Dept Mat Sci & Engn, Hong Kong, Peoples R China
5.Xiamen Univ, Coll Mat & Fujian Prov Key Lab Mat, Xiamen 361000, Fujian, Peoples R China
6.Southern Univ Sci & Technol, Dept Mech & Energy Engn, 1088 Xueyuan Blvd, Shenzhen 518055, Peoples R China
7.Shenzhen R&D Ctr Al Based Hydrogen Hydrolysis Mat, Shenzhen 518055, Peoples R China

Yao, Zhifu,Yang, Tao,Yang, Mujin,et al. Martensite colony engineering: A novel solution to realize the high ductility in full martensitic 3D-printed Ti alloys[J]. MATERIALS & DESIGN,2022,215.

Yao, Zhifu.,Yang, Tao.,Yang, Mujin.,Jia, Xue.,Wang, Chenglei.,...&Liu, Xingjun.(2022).Martensite colony engineering: A novel solution to realize the high ductility in full martensitic 3D-printed Ti alloys.MATERIALS & DESIGN,215.

Yao, Zhifu,et al."Martensite colony engineering: A novel solution to realize the high ductility in full martensitic 3D-printed Ti alloys".MATERIALS & DESIGN 215(2022).