A high strength and low modulus metastable beta Ti-12Mo-6Zr-2Fe alloy fabricated by laser powder bed fusion in-situ alloying

Duan, Ranxi1,2; Li, Sheng2; Cai, Biao2; Zhu, Weiwei1; Ren, Fuzeng1; Attallah, Moataz M.2

2021

10.1016/j.addma.2020.101708

Additive Manufacturing   影响因子和分区

2214-8604

2214-7810

Biocompatible beta Ti-alloys with high strength and low modulus are of interest for additive manufacturing of biomedical implants. In this study, a metastable beta Ti-12Mo-6Zr-2Fe (TMZF) alloy with highly dense structure was successfully fabricated by laser powder bed fusion (LPBF) from low-cost elemental powders. The applied different scanning strategies (simple and chess scan), and post heat treatment can regulate both the texture and secondary phases. The formation of strong {100}< 001 > texture leads to the low elastic modulus of TMZF alloys, while nano-sized alpha '' phases induce significantly strengthening effect. The as-fabricated TMZF alloy via simple scanning strategy shows considerably high strength due to the high density of alpha '', omega phases and sessile dislocations, but it is brittle owing to the presence of omega phase. The TMZF alloy, manufactured using chess scanning strategy, possessed high yield strength of 1,026 MPa, low modulus of 85.7 GPa and good ductility of 12.7%. This results from its unique hierarchical microstructure containing alpha '' phases, heterogeneous grains and the formation of {100}< 001 > texture. After solution heat treatment, the specimens exhibit stronger {100} < 001 > texture, hence lower modulus of 70.9 GPa. High yield strength of 943 MPa was maintained due to the formation of plate-like alpha '' precipitates. The TMZF alloy fabricated by in-situ alloying based LPBF demonstrates comparable strength to that of Ti-6Al-4V alloy, but much lower elastic modulus, suggesting that it could be a potential candidate for some implant applications.

Laser powder bed fusion In-situ alloying beta-titanium alloys Mechanical properties Phase transformation

SCI ; EI

英语

第一 ; 通讯

Fundamental Research Program of Shenzhen[JCYJ20170412153039309] ; Guangdong Innovative & Entrepreneurial Research Team Program, China[2016ZT06C279] ; Royal Society International Exchange, United Kingdom Grant[IEC\NSFC\191319]

Engineering ; Materials Science

Engineering, Manufacturing ; Materials Science, Multidisciplinary

WOS:000609203100084

ELSEVIER

20205109654330

Yield stress ; Alloying ; Elastic moduli ; Fabrication ; Heat treatment ; Iron alloys ; Molybdenum alloys ; Ternary alloys ; Aluminum alloys ; Textures ; Zircaloy ; Biocompatibility ; Vanadium alloys ; High strength alloys ; Phase transitions ; Scanning

Immunology:461.9.1 ; Metallurgy and Metallography:531 ; Metallurgy:531.1 ; Heat Treatment Processes:537.1 ; Aluminum Alloys:541.2 ; Titanium and Alloys:542.3 ; Molybdenum and Alloys:543.3 ; Vanadium and Alloys:543.6 ; Iron Alloys:545.2 ; Physical Chemistry:801.4 ; Materials Science:951

Web of Science

1.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China
2.Univ Birmingham, Sch Met & Mat, Birmingham B15 2TT, W Midlands, England

Duan, Ranxi,Li, Sheng,Cai, Biao,et al. A high strength and low modulus metastable beta Ti-12Mo-6Zr-2Fe alloy fabricated by laser powder bed fusion in-situ alloying[J]. Additive Manufacturing,2021,37.

Duan, Ranxi,Li, Sheng,Cai, Biao,Zhu, Weiwei,Ren, Fuzeng,&Attallah, Moataz M..(2021).A high strength and low modulus metastable beta Ti-12Mo-6Zr-2Fe alloy fabricated by laser powder bed fusion in-situ alloying.Additive Manufacturing,37.

Duan, Ranxi,et al."A high strength and low modulus metastable beta Ti-12Mo-6Zr-2Fe alloy fabricated by laser powder bed fusion in-situ alloying".Additive Manufacturing 37(2021).