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Materials and Manufacturing Processes Volume 28, 2012 - Issue 1
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Original Articles

Martensitic Transformation and Microstructure of Ni-Mn-Ga Magnetic Shape Memory Alloy

Prof. K. Pushpanathan PG and Research Department of Physics, Government Arts College (Autonomous), Karur, IndiaCorrespondence[email protected]
,
R. Santhi Department of Physics, Mahendra Engineering College, Mallasamuthram (W), India
,
R. Chokkalingam Department of Physics, Mahendra Engineering College, Mallasamuthram (W), India
&
M. Mahendran Smart Materials Laboratory, Department of Physics, Thiagarajar College of Engineering, Madurai, India
Pages 72-78 | Received 02 Jan 2012, Accepted 29 Mar 2012, Published online: 10 Jan 2013
 
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Abstract

The effect of annealing on microstructure, crystal structure, martensitic transformation temperature, and magnetization of the as-prepared and annealed Ni-Mn-Ga alloy has been investigated. The present study infers that annealing stabilizes the microstructure and reduces the range of martensitic transformation temperature and improves the magnetic properties of the Ni-Mn-Ga ferromagnetic shape memory alloys. Also, the result presented here shows that coexisting austenite and martensite phases in the as-prepared specimen are separated upon annealing. As the magnetic hysteresis of Ni49.5Mn29.3Ga21.2 alloy is very narrow, the potential utilization of this composition may be expected in micro-actuators.

ACKNOWLEDGMENT

The Management of Thiagarajar College of Engineering and Mahendra Engineering College are highly acknowledged.

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