Antibacterial copper-bearing titanium alloy prepared by laser powder bed fusion for superior mechanical performance

被引:26
|
作者
Liu, Huan [1 ,2 ]
Wang, Hai [1 ,2 ]
Ren, Ling [1 ,2 ,4 ,5 ]
Qiu, Dong [3 ]
Yang, Ke [1 ,2 ]
机构
[1] Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
[2] Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Peoples R China
[3] RMIT Univ, Ctr Addit Mfg, Sch Engn, Melbourne, Vic, Australia
[4] Weiqiao UCAS Sci & Technol Pk, Binzhou Inst Technol, Binzhou 256606, Shandong, Peoples R China
[5] Weigiao UCAS Sci & Technol Pk, Shandong Key Lab Adv Aluminium Mat & Technol, Binzhou 256606, Shandong, Peoples R China
来源
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2023年 / 132卷
关键词
Titanium alloy; Laser powder bed fusion; Boundary engineering; Martensite; Mechanical properties; GRAIN-REFINEMENT; MICROSTRUCTURE; TI-6AL-4V; MARTENSITE; STRENGTH; TRANSFORMATION; BEHAVIOR; TI; OPTIMIZATION; SUBSTRUCTURE;
D O I
10.1016/j.jmst.2022.04.056
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Copper element was added in pure titanium to produce a new biomedical titanium-copper alloy by laser powder bed fusion (LPBF). Addition of copper can eliminate the mismatch of high strength but poor duc-tility problem caused by lath alpha' martensite, which is the usual microstructure of near alpha titanium alloy fabricated by LPBF. Instead of by the usual trade-off relationship between strength and ductility, which is a long-standing challenge for martensitic titanium alloys, in this study, we proposed a boundary engineer-ing strategy and aim to synergistically enhance the strength and ductility of martensitic titanium alloy fabricated by LPBF. It is hypothesized that whilst both low-angle and high-angle grain boundaries are beneficial to the strength, high-angle grain boundary can simultaneously improve the ductility of materi-als. To test this strategy, a Ti-5Cu (wt.%) alloy is selected to compare against pure titanium and Ti-6Al-4V at the same laser processing conditions. EBSD, TEM and XRD analysis show that the as-fabricated LPBF Ti-5Cu alloy is comprised of partially tempered martensite with extraordinarily high number density of both high-angle and low-angle grain boundaries as well as low dislocation density. Such microstructure enables a high tensile strength of 940-1020 MPa, which is at a similar level as LPBF Ti-6Al-4V, and an excellent elongation of 13%-16%, twice as much as that of LPBF Ti-6Al-4V. The mechanism of microstruc-ture refinement in LPBF Ti-5Cu at different levels from prior-beta grains, martensitic packets, blocks to laths is also discussed. (C) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
引用
收藏
页码:100 / 109
页数:10
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