Stability and elastic properties of Ti-alloys for biomedical application designed with electronic parameters

W Elmay,A Eberhardt,P Laheurte,E Patoor,B Bolle,D Laille,F Prima,P Castany,T Gloriant,M Wary

doi:10.1051/epjconf/20100629002

Abstract

Titanium alloys are receiving a big attention for biomedical applications. Recently, β type titanium alloys composed of non-toxic element s are being developed for these applications. The aim of this paper is to study mechanical properties and deformation mechanisms of three beta titanium alloys designed with similar values of Bo-Md and e/a ratio. The contribution of electronic approach to predict beta phase stability is also discussed. The microstructural an alysis and the mechanical characterization are carried out for different meta llurgical states (cold working, solution treatment and aging treatment). Effects of aging tr eatment at low temperature is also investigated, showing that isothermal holding at 40 0°C for 0,6 ks after cold working improves the mechanical properties of alloys.

Highlights

Metallic biomaterials such as stainless steels, Co-Cr alloys and titanium alloys as Ti-Al-6V were mainly utilized for implants
The optical micrographs of the three alloys subjected to solution treatment and water quenched are given by Figure 1, it is shown that the structure of TNZ and TNZT alloys is constituted of β equiaxed grains
The presence of martensite in TN alloy could be explained by the value of Ms which is above room temperature

Summary

Introduction

Metallic biomaterials such as stainless steels, Co-Cr alloys and titanium alloys as Ti-Al-6V were mainly utilized for implants. It was reported that some alloying element (V, Co) can present a potential toxic effect [1]. Are developed for biomedical application because of their excellent properties such as superelasticity, shape memory effect, low Young’s modulus, corrosion resistance and their good biocompatibility. The superelasticity and the low Young’s modulus in titanium alloys are attributed to the reversible martensitic transformation between the β parent phase and the α’’ martensite phase. The temperature of this transformation can be controlled by addition of elements. The effect of Zr addition on the mechanical properties, the shape memory effect and the phase stability was studied by J.I. Kim and al. The yielding stress inducing plastic deformation increases with increasing the amount of Zr in the alloy and that is because of the solid solution hardening

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