Characteristics of β-type Ti-41Nb alloy produced by laser powder b e d fusion: Microstructure, mechanical properties and in vitro biocompatibility

被引：11
|
作者：
Li, Zhongjie [1 ]
Qiu, Jiajun [2 ]
Xu, Hao [1 ]
Dong, Anping [1 ,3 ]
He, Lin [1 ]
Zhu, Guoliang [1 ,3 ]
Du, Dafan [1 ]
Xing, Hui [1 ]
Liu, Xuanyong [2 ]
Sun, Baode [1 ,3 ]
机构：
[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai Key Lab Adv High Temp Mat & Precis Formi, Shanghai 200240, Peoples R China
[2] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China
[3] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China
来源：
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2022年 / 124卷
基金：
中国国家自然科学基金;
关键词：
Laser powder bed fusion; Ti-41Nb; Microstructure; Mechanical properties; In vitro biocompatibility; COMMERCIALLY PURE TITANIUM; MARTENSITIC-TRANSFORMATION; LOW-MODULUS; TI; METAL; SUPERELASTICITY; TEMPERATURE; IMPLANTS; BEHAVIOR; PHASE;
D O I：
10.1016/j.jmst.2022.02.026
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A beta-type Ti-41Nb alloy with high relative density has been successfully fabricated by laser powder bed fusion ( L -PBF) using pre-alloyed powders for potential implant application. The homogeneous microstructure can be achieved in L -PBF fabricated ( L -PBFed) Ti-41Nb alloy but slight composition segregation was detected along molten pool boundaries. The L -PBFed alloy was dominated by typical epitaxial columnar grains with strong ( 001 ) grain orientation along building direction (BD), and cellular structure was distinguished within the columnar grains. The main reasons for this microstructure can be attributed to effective thermal gradient and epitaxial growth. L -PBFed alloy exhibited higher mechanical strength compared with cold rolling plus annealing (CRA) alloy due to the finer grains, dislocations accumulation and different TRIP behaviors, accom panied by good ductility. It also exhibited much lower thermal conductivity and better hydrophilic feature than those of CP-Ti. Besides, the L -PBFed alloy exhibited slightly better cell spread and cell proliferation rates compared with CP-Ti. Moreover, L -PBFed alloy presented better alkaline phosphatase (ALP) activities and extracellular matrix (ECM) mineralization, which suggests that the L -PBFed alloy can stimulate the osteogenic differentiation of rat bone mesenchymal stem cells. The Ti-41Nb alloy, fabricated by L -PBF, reveals a good combination of mechanical properties, physicochemical properties and biocompatibility, exhibiting the great potential as the dental implant. (c) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
引用
收藏
页码：260 / 272
页数：13
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