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

Journal of Materials Science, ISSN: 0022-2461, Vol: 46, Issue: 19, Page: 6224-6234
2011
  • 8
    Citations
  • 0
    Usage
  • 10
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    8
    • Citation Indexes
      8
  • Captures
    10

Conference Paper Description

In this study, Electromagnetic Levitation (EML) technique was utilized to explore the effect of bulk supercooling and rapid solidification in alloys with CoNiGa and CoNi Ga (at.%) compositions. The effects of α + β on the martensitic and austenitic transformation temperatures and magnetic properties were investigated. The presence of c 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 CoNi Ga 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. © Springer Science+Business Media, LLC 2011.

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