Comparison studies on solid state diffusion of Ni–Ti and Ni–TiH2 under CaH2 reducing environment

Mohd Zaki, Hafizah Hanim and Abdullah, Jamaluddin (2014) Comparison studies on solid state diffusion of Ni–Ti and Ni–TiH2 under CaH2 reducing environment. Materials Letters, 121. pp. 36-39. ISSN 0167-577X

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Abstract

Phase formation of NiTi via solid state diffusion from Ni–Ti and Ni–TiH2 powders under a CaH2 reducing environment were investigated. Elemental powder sintering of Ni–Ti at equiatomic composition did not result in single phase TiNi, but rather in multi-phases, including Ti2Ni, TiNi, and TiNi3. In this work, we show evidence that powder sintering of Ni–TiH2 produces single phase NiTi with good transformation heat both on cooling and heating with ΔHA–M=26.04 J/g and ΔHM–A=25.53 J/g, respectively. The use of CaH2 as the in situ reducing agent and of TiH2 to replace Ti as the starting powder, protected the sample successfully from oxidation.

Item Type:	Article (Journal)
Additional Information:	7612/62556
Uncontrolled Keywords:	Shape memory materials, Porous materials, Solid state diffusion, Phase transformation, Reducing environment
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:	28 Mar 2018 11:51
Last Modified:	28 Mar 2018 11:51
URI:	http://irep.iium.edu.my/id/eprint/62556

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