TENSILE PROPERTIES OF A beta-TITANIUM ALLOY FOR IMPLANT APPLICATION

摘要

There has been a spurt in use of titanium alloys for biomedical implant application since they are biocompatible and possess lower modulus of elasticity (MoE) with higher specific strength. Among the titanium alloys, focus has completely shifted to beta titanium alloys, which possess lower MoE and are composed of non-toxic elements like Nb, Ta, Zr, and Mo compared to higher MoE alpha + beta alloys which also posses toxic elements like V and Al. The alloy with a nominal composition of Ti-35Nb-7Zr-5Ta is among the latest beta titanium alloys being pursued for implant applications. The tensile properties were studied for various heat treatment conditions and the heat treatment for bulk production has also been suggested. Higher values of tensile strengths were realized with lower MoE (55GPa) as reported in the literature. Work hardening studies show that this alloy possesses favorable characteristics for cold processing.