Materials Transactions, JIM
Online ISSN : 2432-471X
Print ISSN : 0916-1821
ISSN-L : 0916-1821
Phase Transformations and Magnetostriction in Ni–Mn–Ga Ferromagnetic Shape Memory Alloys
Koichi TsuchiyaAkira OhashiDaigo OhtoyoHiroyuki NakayamaMinoru UmemotoPaul G. McCormick
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2000 Volume 41 Issue 8 Pages 938-942

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Abstract

Composition dependence of martensitic transformation and ferromagnetic transformation behavior has been investigated for Ni–Mn–Ga ferromagnetic shape memory alloys in a polycrystalline state. DSC measurements were performed to determine the transformation temperatures. Magnetic properties were studied by VSM. It was revealed that martensitic transformation temperature depends strongly on valence electron concentration, ea, of the alloys, while ferromagnetic transformation temperature exhibits only mild dependence. Room temperature magnetization was found to decrease with increasing ea. Magnetostriction was measured for Ni–23.1Mn–24.6Ga alloy as a function of magnetic field and temperature. The largest magnetostriction was observed near the martensitic transformation temperatures.

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© The Japan Institute of Metals
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