Martensitic Transformation, Structure and Magnetic Properties of Co-Ni-Ga Ferromagnetic Shape Memory Alloys

Abstract:

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In the present paper the effect of heat treatment on microstructure, martensitic transformation temperatures and magnetic properties behavior of Co-Ni-Ga pollycrystal was discussed in detail. Microscopic observations revealed two types of two phase polycrystalline alloys: i) martensite with γ-precipitates and ii) parent phase with γ-precipitates. Making use of Xray and electron diffraction methods the crystal structure of martensite phase was identified as bct structure (with co/ao about 1.2). Annealing of Co-Ni-Ga alloy at 1223K/40 min causes a separation of martensitic and magnetic transformation and an increase of the Curie temperature by about 70K, after this annealing any significant structural changes in the parent (martensitic) and γ phase are not observed.

Info:

Periodical:

Solid State Phenomena (Volume 130)

Edited by:

Danuta Stróż & Małgorzata Karolus

Pages:

141-146

DOI:

10.4028/www.scientific.net/SSP.130.141

Citation:

B. Kostrubiec et al., "Martensitic Transformation, Structure and Magnetic Properties of Co-Ni-Ga Ferromagnetic Shape Memory Alloys", Solid State Phenomena, Vol. 130, pp. 141-146, 2007

Online since:

December 2007

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$35.00

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