The Thermal Transformation Arrest Phenomenon in NiCoMnAl Heusler Alloys

Metals

Xiao Xu³  Wataru Ito²  Masashi Tokunaga¹  Takumi Kihara¹  Kengo Oka¹  Rie Y. Umetsu⁴  Takeshi Kanomata³ 

[1] International MegaGauss Science Laboratory, Institute for Solid State Physics, The University of Tokyo, Kashiwa 277-8581, Japan; E-Mails:;Materials Science and Engineering, Sendai National College of Technology, Natori 981-1239, Japan; E-Mail:;Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan; E-Mails:;Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan; E-Mail:

关键词: thermal transformation arrest;    kinetic arrest;    actuator materials;    metamagnetic shape memory alloy;    martensitic transformation;    pulsed high magnetic field;    NiCoMnIn;    NiCoMnAl;   

DOI  :  10.3390/met3030298

来源: mdpi

【 摘 要 】

In this report, we present findings of systematic research on NiCoMnAl alloys, with the purpose of acquiring a higher thermal transformation arrest temperature (T_A). By systematic research, T_A in the NiCoMnAl alloy systems was raised up to 190 K, compared to the highest T_A 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 Ni_50−xCo_xMn_50−yAl_y 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”.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland