Influence of martensitic transformation on mechanical compatibility.pdf

Materials Science and Engineering A 438–440 (2006) 391–394 Influence of martensitic transformation on mechanical compatibility of biomedical type titanium alloy TLM Yu Zhentao ∗, Zhou Lian Northwest Institute for Nonferrous Metal Research, P.O. Box 51, Xi’an, Shaanxi 710016, China Received 19 April 2005; received in revised form 19 October 2005; accepted 25 December 2005 Abstract The tensile mechanical properties and microstructure transformation of newly developed type biomedical Ti alloy TLM consisting of bio- compatible elements Zr, Sn, Mo, Nb were investigated to provide excellent mechanical compatibility matching. The lower modulus of elasticity and yield strength, and better plasticity results from martensite phase or stress-induced martensite transformation. The aging treatment leads to dispersion strengthening and fine-grain strengthening. © 2006 Published by Elsevier B.V. Keywords: Biomaterials; type titanium alloy; Martensitic transformation; Mechanical compatibility; Surgical-implanting materials 1. Introduction tigated, and a comparative analysis is discussed by comparison with Ti–13Nb–13Zr alloy. Biomedical Ti alloy materials, especially for surgical implanting materials, not only require better biocompatibil- 2. Experimental procedures ity, but also the mechanical compatibility matching (lower E) should be guaranteed to prevent from the “stress-shielding” and The ingot of 25 kg of TLM alloy, consisting of commercially implants failure [1]. On the other hand, the biomaterials must pure Ti sponge (