Fabrication of Porous NiTi Shape Memory Alloy Objects by Powder Metallurgy for Biomedical Applications

Abstract

This research, studied the effects of compacting pressure (150-450) MPa and Copper additions (2.5, 5, 7.5 and10) wt% on the mechanical properties of NiTi based shape memory alloys prepared by powder metallurgy. Several mechanical tests such as Rockwall macro hardness measurements, compression test and shape memory properties of the prepared alloys were achieved. The results showed that the addition of Copper with (2.5-10) wt. % to NiTi prepared alloy resulted decreasing the hardness relatively with comparison to master alloy without copper also, there is a distinguished increase in SME properties obtained from hardness test for the NiTi alloys with addition of copper. The result showed that the increasing in compacting pressure and Cu additives have an essential effect by improvement the mechanical properties of the prepared alloys.