Structure and mechanical properties of Ti-10Zr-xMo alloys for biomedical applica-tions
The effects of molybdenum on the structure and mechanical properties of a Ti-10Zr-based system were studied with emphasis on improving the strength/modulus ratio. Commercially pure titanium (c. p. Ti) was used as a control. As-cast Ti-10Zr and a series of Ti-10Zr-xMo (x=l,3,5 and 7. 5 wt. ％) alloys prepared by using a dental cast machine were investigated. X-ray diffraction (XRD) for phase analysis was conducted with a diffractometer. Threepoint bending tests were performed to evaluate the mechanical properties of all specimens. The experimental results indicated that these alloys obviously had different structures and mechanical properties with the addition of various amounts of Mo. The cast c. p. Ti and Ti-lOZr has a hexagonal a phase. When 1 wt. ％ Mo was introduced into the Til0Zr alloy, the structure remained essentially unchanged. When Mo content was 3 or 5 wt. ％, the martensitic α structure was found. When Mo content was increased to 7. 5 wt. ％, retention of the meta-stable beta phase began. Among all Ti-10Zr-xMo alloys,α-phase Ti-10Zr-5Mo alloy had the lowest elastic modulus. Moreover,the ω phase was formed in the alloy containing 7. 5 wt％Mo with higher hardness and bending modulus. It is noteworthy that the Ti-10Zr-5Mo alloy exhibited higher bending strength/modulus ratios at 20. 1. Furthermore, the elastically recoverable angles of this alloy (26. 4°) were much greater than those of c. p. Ti (2. 7°). In the current search for better implant materials,the low modulus,ductile property,excellent elastic recovery capability and high strength/modulus ratio of α-phase Ti-10Zr-5Mo alloy seem to be promising candidates.
Titanium alloys mechanical properties phase transformation
Wen-Fu Ho Yu-Chi Li Hsueh-Chuan Hsu Shih-Ching Wu Shih-Kuang Hsu
Department of Materials Science and Engineering,Da-Yeh University,Changhua,Taiwan,ROC Department of Dental Technology and Materials Science,Central Taiwan University of Science and Techn
国际会议
The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)
北京
英文
2135-2138
2011-06-19（万方平台首次上网日期，不代表论文的发表时间）