中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 25 No. 7 July 2015 |
（1. Stomatology Department, 2nd Affiliated Hospital, Harbin Medical University, Harbin 150086, China;
2. Department of Radiology, 4th Affiliated Hospital, Harbin Medical University, Harbin 150001, China;
3. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China）
Abstract:To develop novel β-type biomedical titanium alloys, a series of Ti-15Mo-xNb alloys(x=0, 5, 10 and 15, mass fraction in %) were designed and prepared by using vacuum arc melting method. The present study focused on the effect of Nb addition on the microstructure, mechanical properties and castability of Ti-15Mo alloy. Phase analysis and microstructure observation show that all the alloys consist of single β phase and the equiaxed β grain is refined with increasing Nb content. These β-type Ti-15Mo-xNb alloys exhibit good plasticity and rather low compression elastic modulus (in the range of 18.388-19.365 GPa). After Nb addition, the compression yield strength of the alloys increases. With increasing Nb content, the micro-hardness of the alloys decreases. The alloys exhibit obvious fibrous strip microstructure after cold compression deformation. The castability test shows that the castability of the alloys after Nb addition decreases and that of the Ti-15Mo alloy is the highest (92.01%).
Key words: β-titanium alloys; Ti-Mo-Nb; Nb; castability; microstructure; mechanical properties
