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

The Thermal Transformation Arrest Phenomenon in NiCoMnAl Heusler Alloys

1
, 2
, 3
, 3
, 3
, 4
, 1,5
 and 1,*
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 which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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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