Superelastic and robust NiTi alloys with hierarchical microstructures by laser powder bed fusion

Zhong, Shiyu1,2; Zhang, Lei1,2,3; Li, Ying1; Chen, Xuliang1,2; Chai, Sensen4; Li, Gan1,2,5; Liu, Hui1,2; Guo, Chuan1; Wang, Xiebin6; Zhang, Dingfei7,8; Lu, Jian1,2,9,10

2024-06-25

10.1016/j.addma.2024.104319

ADDITIVE MANUFACTURING   影响因子和分区

2214-8604

2214-7810

Nickel-titanium (NiTi) alloys perform large recoverable deformation and can be produced into sophisticated and customized components through additive manufacturing (AM). However, AM NiTi alloys often suffer from poor tensile superelasticity (or pseudoelasticity), strength, and total elongation due to their coarse column grains and undesirable textures. Herein, we showcase novel hierarchical NiTi alloys prepared by laser powder bed fusion. The hierarchical NiTi alloys compromise fish scale micron grains, sub-micron herringbone grains, sub-micron equiaxed grains, and high-density dislocations, predominantly featuring <111> and <110> orientations parallel to both the building and tensile direction. Consequently, they demonstrate a record-high maximum recoverable strain (epsilon(rec)) of 5-6 %, an excellent stable epsilon(rec) of similar to 3.5 % without failure over 120 tensile cycles, an ultrahigh tensile strength from 875 to 1029 MPa, and a large total elongation from 8.7 % to 14.2 %. These remarkable property combinations outperform those of state-of-the-art AM NiTi alloys. This work significantly resolves a longstanding performance dilemma in AM NiTi alloys without needing post-heat treatment, offering a fresh perspective on strengthening AM shape memory alloys through microstructure modification.

Powder bed fusion Shape memory alloy Microstructures Superelasticity Mechanical properties

SCI ; EI

英语

其他

Guangdong Provincial Department of Science and Technology (Key Area Research and Development Program of Guangdong Province)[2020B090923002] ; Shenzhen-Hong Kong Science and Technology Innovation Cooperation Zone Shenzhen Park Project[HZQB-KCZYB-2020030] ; RGC Theme-based Research Scheme[AoE/M-402/20]

Engineering ; Materials Science

Engineering, Manufacturing ; Materials Science, Multidisciplinary

WOS:001288555000001

ELSEVIER

Web of Science

1.CityU Shenzhen Futian Res Inst, Shenzhen, Peoples R China
2.City Univ Hong Kong, Dept Mech Engn, Hong Kong, Peoples R China
3.Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Wuhan, Peoples R China
4.Chongqing Univ Sci & Technol, Sch Met & Mat Engn, Chongqing, Peoples R China
5.Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen Key Lab Addit Mfg High Performance Mat, Shenzhen, Peoples R China
6.Shandong Univ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Minist Educ, Jinan, Peoples R China
7.Chongqing Univ, Coll Mat Sci & Engn, Chongqing, Peoples R China
8.Chongqing Univ, Natl Engn Res Ctr Magnesium Alloys, Chongqing, Peoples R China
9.City Univ Hong Kong, Shenzhen Res Inst, Greater Bay Joint Div, Shenyang Natl Lab Mat Sci, Shenzhen, Peoples R China
10.City Univ Hong Kong, Hong Kong Branch, Natl Precious Met Mat Engn Res Ctr, Hong Kong, Peoples R China

Zhong, Shiyu,Zhang, Lei,Li, Ying,et al. Superelastic and robust NiTi alloys with hierarchical microstructures by laser powder bed fusion[J]. ADDITIVE MANUFACTURING,2024,90.

Zhong, Shiyu.,Zhang, Lei.,Li, Ying.,Chen, Xuliang.,Chai, Sensen.,...&Lu, Jian.(2024).Superelastic and robust NiTi alloys with hierarchical microstructures by laser powder bed fusion.ADDITIVE MANUFACTURING,90.

Zhong, Shiyu,et al."Superelastic and robust NiTi alloys with hierarchical microstructures by laser powder bed fusion".ADDITIVE MANUFACTURING 90(2024).