TITLE

Investigating the effects of bulk supercooling and rapid solidification on Co-Ni-Ga ferromagnetic shape memory alloys

AUTHOR(S)
Kalaantari, Haamun; Amini, Shaahin; Hong, Jeongmin; Abbaschian, Reza
PUB. DATE
October 2011
SOURCE
Journal of Materials Science;Oct2011, Vol. 46 Issue 19, p6224
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
In this study, Electromagnetic Levitation (EML) technique was utilized to explore the effect of bulk supercooling and rapid solidification in alloys with CoNiGa and CoNiGa (at.%) compositions. The effects of γ + β on the martensitic and austenitic transformation temperatures and magnetic properties were investigated. The presence of γ phase was found to suppress the martensitic and austenitic transformations to below room temperature. Bulk supercooling and rapid solidification led to the formation of homogeneous martensitic phase from the hyperperitectic CoNiGa alloy. In contrast with pure martensite phase in CoNiGa, the hyperperitectic martensite in supercooled CoNiGa sample showed no grain boundaries microsegregation and embrittlement that caused deep cracks along grain boundaries. The sample had a high Curie temperature about 400 K and good directional magnetic properties.
ACCESSION #
62614124

 

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