Phase Transformation in Ni52Mn21+xGa27-x(x =0-5) Magnetic Shape Memory Alloys

Acta Metall Sin

2004, Vol. 40

Issue (9): 972-974 DOI:

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Phase Transformation in Ni52Mn21+xGa27-x(x =0-5) Magnetic Shape Memory Alloys

GUO Shihai; ZHANG Yanghuan; LI Jianliang; QI Yan; WANG Xinlin

Department of Functional Material Research; Central Iron and Steel Research Institute; Beijing 100081

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GUO Shihai; ZHANG Yanghuan; LI Jianliang; QI Yan; WANG Xinlin. Phase Transformation in Ni52Mn21+xGa27-x(x =0-5) Magnetic Shape Memory Alloys. Acta Metall Sin, 2004, 40(9): 972-974 .

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Abstract The martensitic and magnetic phase transformations in polycrystalline non-stoichiometric Ni52Mn21+xGa27-x(x=0-5) alloys were investigated. The experimental results show that the alloys exhibit ferromagnetic and thermo-elastic martensitic transformations. The martensitic transformation temperatures (Ms) increase with increasing Mn content and reach above room temperature when x>4. The martensitic transformation hysteresis (δT) decrease with increasing x. The magnetic phase transformation temperatures (Curie temperature TC increase with an increase of x within a small range and keep around 348 K when x>2. In addition, an alloy composition of Ni52Mn25Ga23 with potential practicality was obtained, which has a higher martensitic transformation temperature than room temperature and a transformation hysteresis of only 5 K.

Key words: Ni-Mn-Ga martensitic transformation ferromagnetic phase transformation

Received: 29 August 2003

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	GUO Shihai
	ZHANG Yanghuan
	LI Jianliang
	QI Yan
	WANG Xinlin

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2004/V40/I9/972

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