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Metals 2013, 3(3), 298-311; doi:10.3390/met3030298
Article

The Thermal Transformation Arrest Phenomenon in NiCoMnAl Heusler Alloys

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1 Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan 2 Materials Science and Engineering, Sendai National College of Technology, Natori 981-1239, Japan 3 International Mega Gauss Science Laboratory, Institute for Solid State Physics, The University of Tokyo, Kashiwa 277-8581, Japan 4 Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan 5 Research Institute for Engineering and Technology, Tohoku Gakuin University,Tagajo 985-8537, Japan
* Author to whom correspondence should be addressed.
Received: 20 May 2013 / Revised: 26 June 2013 / Accepted: 14 August 2013 / Published: 22 August 2013
(This article belongs to the Special Issue Shape Memory Alloys)
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Abstract

In this report, we present findings of systematic research on NiCoMnAl alloys, with the purpose of acquiring a higher thermal transformation arrest temperature (TA). By systematic research, TA in the NiCoMnAl alloy systems was raised up to 190 K, compared to the highest TA of 130 K in NiCoMnIn. For a selected alloy of Ni40Co10Mn33Al17, magnetization measurements were performed under a pulsed high magnetic field, and the critical magnetic field-temperature phase diagram was determined. The magnetic phase diagram for Ni50-xCoxMn50-yAly was also established. Moreover, from the discussion that the formerly called “kinetic arrest phenomenon” has both thermodynamic and kinetic factors, we suggest a terminology change to the “thermal transformation arrest phenomenon”.
Keywords: thermal transformation arrest; kinetic arrest; actuator materials; metamagnetic shape memory alloy; martensitic transformation; pulsed high magnetic field; NiCoMnIn; NiCoMnAl thermal transformation arrest; kinetic arrest; actuator materials; metamagnetic shape memory alloy; martensitic transformation; pulsed high magnetic field; NiCoMnIn; NiCoMnAl
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Xu, X.; Ito, W.; Tokunaga, M.; Kihara, T.; Oka, K.; Umetsu, R.Y.; Kanomata, T.; Kainuma, R. The Thermal Transformation Arrest Phenomenon in NiCoMnAl Heusler Alloys. Metals 2013, 3, 298-311.

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