Informatics Publishing Limited

Mustafa K. Ibrahim ¹, E . Hamzah ¹, Safaa N. Saud ¹, E. N. E. Abu Bakar ¹, A. Bahador ¹

Affiliations
1 Faculty of Mechanical Engineering, UniversitiTeknologi Malaysia, 81310 UTM Johor Bahru, Johor, MY

Abstract

Objective: The influence of microwave sintering time and Homogenization Treatment (HT) on the microstructure, density, phase composition, mechanical properties and phase transformation temperatures of biocompatible Ti-51%Ni Shape Memory Alloys (SMAs) are determined. Methods/Statistical Analysis: These alloys are fabricated at 900˚C for two different sintering times such as 5 min. and 30 min. Findings: The Field Emission Scanning Electron Microscopy (FESEM) micrographs show microstructure of needle-like morphology except for the sample which sintered at 900˚C for 30 min. without HT. Applications/Improvements: Sample synthesized at 900˚C for 30 min. without HT revealed the highest performance in terms of maximum compressive strength (1376 MPa) at 29% strain, Austenite finish temperature (Af) of 27˚C and Martensite finish temperature (Mf) of 47˚C at 18% porosity. They showed the Af temperature very close to the human body temperature, thus prospective for biomedical applications. During heating, the Differential Scanning Calorimeter (DSC) baseline shows multi-endothermic peaks, while during the cooling process there is only one exothermic peak.

Keywords

Mechanical Properties, Microstructure, Powder Metallurgy, Ti-51%Ni SMAs.

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