Effect of different reducing agents on phase formation and transformation behaviour of Ni-Ti shape memory alloy

Mohd Zaki, Hafizah Hanim and Bahrudin, Nik Amnani and Abdullah, Jamaluddin and Sarifuddin, Norshahida (2018) Effect of different reducing agents on phase formation and transformation behaviour of Ni-Ti shape memory alloy. In: International Conference on Advances in Manufacturing and Materials Engineering (ICAMME 2017), 8th–9th August 2017, Kuala Lumpur, Malaysia.

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Abstract

In this study, NiTi synthesized via solid-state sintering from Ni-TiH2 powders in reducing environments using (i) CaH2 (ii) MgH2 and (iii) CaH2 and MgH2 as in situ reducing agent were investigated. The phase formation was characterized by means of scanning electron microscope (SEM), energy-dispersive spectroscope (EDS) and powder X-ray diffraction (XRD), while transformation behavior was analyzed using differential scanning calorimetry (DSC) measurement. Among these three reducing agents, synthesis in reducing environment using CaH2 as in situ reducing agent resulted in the formation of single phase NiTi with enthalpy change of 25-26 J/g, which is similar to melt-cast NiTi alloys. Specimens sintered in reducing environments using MgH2 and MgH2+CaH2 as in situ reducing agents have lower enthalpy change, ~16-21 J/g compared to CaH2. This work established the fact that, synthesis in different reducing environment appears to have profound effects on the phase formation and transformation behavior of NiTi.

Item Type:	Conference or Workshop Item (Plenary Papers)
Additional Information:	7612/61320
Uncontrolled Keywords:	Energy dispersive, Enthalpy change, NiTi shape memory alloys, Phase formations, Powder X ray diffraction, Reducing environment, Solid state sintering, Transformation behavior
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA164 Bioengineering
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Manufacturing and Materials Engineering
Depositing User:	Dr Hafizah Hanim Mohd Zaki
Date Deposited:	01 Mar 2018 15:27
Last Modified:	02 Aug 2018 10:32
URI:	http://irep.iium.edu.my/id/eprint/61320

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