Characteristics ofβ-type Ti-41Nb alloy produced by laser powder bed fusion:Microstructure,mechanical properties and in vitro biocompatibility

作     者：Zhongjie Li Jiajun Qiu Hao Xu Anping Dong Lin He Guoliang Zhu Dafan Du Hui Xing Xuanyong Liu Baode Sun Zhongjie Li;Jiajun Qiu;Hao Xu;Anping Dong;Lin He;Guoliang Zhu;Dafan Du;Hui Xing;Xuanyong Liu;Baode Sun

作者机构：Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision FormingSchool of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240P.R.China State Key Laboratory of High Performance Ceramics and Superfine MicrostructureShanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050P.R.China State Key Laboratory of Metal Matrix CompositesSchool of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240P.R.China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2022年第124卷第29期

页      面：260-272页

核心收录：

学科分类：08[工学] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：the National Natural Science Foundation of China(Nos.51871152,51831011 and 51821001) the manager Zhonglun Li and Wenjie Li of TRUMPF(CHINA)CO.,LTD。 

主　　题：Laser powder bed fusion Ti-41Nb Microstructure Mechanical properties In vitro biocompatibility 

摘      要：Aβ-type Ti-41 Nb 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-41 Nb 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,accompanied 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-41 Nb alloy,fabricated by L-PBF,reveals a good combination of mechanical properties,physicochemical properties and biocompatibility,exhibiting the great potential as the dental implant.