Effect of annealing on surface morphology of porous NiTi shape memory alloy

Abd Kadir, Nur Amanina and Mohd Zaki, Hafizah Hanim and Abdullah, Jamaluddin and Mohd Daud, Farah Diana and Sarifuddin, Norshahida (2026) Effect of annealing on surface morphology of porous NiTi shape memory alloy. Metal Science and Heat Treatment, 67 (11-12). pp. 926-931. ISSN 0026-0673 E-ISSN 1573-8973

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Abstract

The effect thermal annealing on the surface morphology of porous NiTi shape memory alloy by forming the in-situ oxide layer was studied. The porous samples fabricated via powder metallurgy was thermal annealed at various temperatures ranging from 300 to 700°C. A scanning electron microscope equipped with an energy dispersive spectrometer and an x-ray diffractometer were used to analyze the surface morphology and identify the phases, respectively. After annealing, the samples were tested for biocompatibility to evaluate the Ni ion leaching using an inductive pair plasma mass spectrometer. It was found that a stable TiO2 layer is formed on the surface of the porous NiTi alloy during annealing. However, at higher annealing temperatures, a thicker unstable and brittle TiO2 oxide layer is formed, resulting in an increased release of Ni ions. Overall, the development of a porous NiTi alloy with a passivated surface through thermal annealing has shown promising outcomes for potential applications in the biomedical field.

Item Type:	Article (Journal)
Uncontrolled Keywords:	shape memory alloy, NiTi alloy, thermal annealing, surface morphology, porous, biocompatibility
Subjects:	T Technology > TP Chemical technology
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Mechanical Engineering Kulliyyah of Engineering
Depositing User:	Dr Hafizah Hanim Mohd Zaki
Date Deposited:	30 Oct 2026 16:25
Last Update:	30 Oct 2026 16:25
Queue Number:	2026-10-Q5892
URI:	http://irep.iium.edu.my/id/eprint/125398
Indexed In:	WOS and SCOPUS, ERA, Google Scholar

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