Effect of Alloying Elements (Mo and Al) on Biomaterials Ti-Ta Shape Memory Alloys

Abstract

Titanium-Tantalum shape memory materials have widespread potential in biomedical applications In this research the alloy of (Ti-Ta) has been prepared by powder metallurgy technique use fixed percentage of Ta (30 at%), then the alloying elements (Mo and Al) has been added in different compositions (1 at%, 2 at% and 3%) to the master alloy (70% Ti -30% Ta) in order to improve corrosion resistance and mechanical properties . examination were done by using XRD, SEM technique, DSC, Vickers hardness, the porosity percentage and corrosion rate in different solutions (artificial saliva, Ringer solution and blood plasma).The XRD and microstructure results show that all samples with and without additives consist of two phases (β-phase) and (α-phase) at room temperature and the addition of Mo and Al in these percentages does not have effect on present phases. he transformation temperature decreases with the increasing in Mo percentage while this temperature increase with the increasing in Al percentage. The addition of Mo and Al leads to lower the hardness except 3% Mo this sample has highest value than the master sample. The porosity percentage decrease gradually with the increasing in the both Mo and Al percentage due to the better inter diffusion caused by these additives. From the corrosion results in 3% Mo the alloys have less corrosion rate than the master or other percentage (1 at% and 2 at %) In all solutions (artificial saliva, simulated body fluid( Ringer solution) and blood plasma) but the Al has a good corrosion rate in (artificial saliva and blood plasma).