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Onset Magnetic Field for Rearrangement of Martensite Variants in Ni2MnGa

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Abstract:

The magnetic field strength, Hs, at which rearrangement of martensite variants initiates has been investigated in Ni2MnGa ferromagnetic shape memory alloy by magnetization measurements in the [001]P direction ("P" stands for the parent phase). We have also calculated Hs from the magnetocrystalline anisotropy constant Ku, spontaneous magnetization Ms, twinning shear s and twinning stress τreq by considering the condition for the rearrangement of martensite variants reported previously [Int. J. Appl. Electromagnetics and Mechanics, 23 (2006) 45]. The calculated value of Hs is in good agreement with the experimental value for all the examined temperatures. The agreement confirms the applicability of the reported condition.

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Periodical:

Materials Science Forum (Volumes 561-565)

Pages:

1109-1112

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.561-565.1109

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Online since:

October 2007

Authors:

Takashi Fukuda, Nariaki Okamoto, Tomoyuki Kakeshita

Keywords:

Magnetocrystalline Anisotropy, Magnetostriction, Shape Memory Alloy Actuator, Twinning Stress

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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