Fabrication of porous TiZrNbTa high-entropy alloys/Ti composite with high strength and low Young’s modulus using a novel MgO space holder

作     者：Tao Xiang Jie Chen Weizong Bao Shuyan Zhong Peng Du Guoqiang Xie Tao Xiang;Jie Chen;Weizong Bao;Shuyan Zhong;Peng Du;Guoqiang Xie

作者机构：School of Materials Science and EngineeringHarbin Institute of Technology(Shenzhen)Shenzhen 518055China State Key Laboratory of Advanced Welding and JoiningHarbin Institute of TechnologyHarbin 150001China 

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

年 卷 期：2023年第167卷第36期

页      面：59-73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] 0813[工学-建筑学] 0814[工学-土木工程] 

基　　金：financially supported by the National Natural Science Foundation of China(No.51871077) the Guangdong Basic and Applied Basic Research Foundation(No.2021A1515012626) the Shenzhen Knowledge Innovation Plan-Fundamental Re-search(Discipline Distribution)(No.JCYJ20180507184623297) the S henzhen Science and Technology Plan-Technology Innovation(No.KQJSCX20180328165656256) the Development and Reform Commission of Shenzhen Municipality-Shenzhen R&D Center for Al-based Hydrogen Hydrolysis Materials(No.ZX20190229) the Startup Foundation from Shenzhen and Startup Foundation from Harbin Institute of Technology(Shenzhen). 

主　　题：TiZrNbTa/Ti titanium matrix composite MgO space holder Low Young’s modulus High strength 

摘      要：Stress shielding is caused by the mismatch of stiffness between bone and implant materials,which may give rise to bone resorption and loosening,thereby causing implantation failure.There is a huge gap between Young’s modulus of human bone and low Young’s modulusβTi alloys.A porous structure design can achieve the target of low Young’s modulus,and thus achieve the matching between human bone and implant materials.However,a suitable space holder(SH)that can be applied at high temperatures and sintering pressure has not been reported.In this study,the TiZrNbTa/Ti titanium matrix composite(TMC)with high strength and large ductility was used as scaffold materials and combined the SH technique with the spark plasma sintering(SPS)technique to obtain a porous structure.A novel space holder,i.e.,MgO particles was adopted,which can withstand high-temperature sintering accompanied by a sintering pressure.The porous TiZrNbTa/Ti with 40 vol.%MgO added exhibits a maximum strength of 345.9±10.4 MPa and Young’s modulus of 24.72±0.20 GPa,respectively.It possesses higher strength compared with human bone and matches Young’s modulus of human bone,which exhibits great potential for clinical application.