The Thermal Transformation Arrest Phenomenon in NiCoMnAl Heusler Alloys

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...

Full description

Bibliographic Details
Main Authors: Rie Y. Umetsu, Takeshi Kanomata, Kengo Oka, Takumi Kihara, Wataru Ito, Masashi Tokunaga, Xiao Xu, Ryosuke Kainuma
Format: Article
Language:English
Published: MDPI AG 2013-08-01
Series:Metals
Subjects:
Online Access:http://www.mdpi.com/2075-4701/3/3/298
Description
Summary: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”.
ISSN:2075-4701