Microstructure and magnetic properties of rapidly solidified Ni 2(Mn,Fe)Ga Heusler alloys

R. V.S. Prasad, M. Manivel Raja, G. Phanikumar

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Citations (Scopus)

Abstract

This study reports detailed microstructural and magnetic characterization of rapidly solidified Ni2(Mn,Fe)Ga heusler alloys processed using the melt spinning technique. Series of Ni50Mn(25-x)Fe( x= 2, 5, 8, 11)Ga25 alloys were prepared by vacuum arc melting and then melt spun at constant wheel speed of 20 m/sec to obtain samples in the form of ribbons. X-ray diffraction analysis of as-cast Ni 2(Mn,Fe)Ga alloy with different 'Fe' concentrations revealed austenite phase with L21 Heusler atomic order at room temperature. Transmission electron microscopy of melt spun ribbons reveals a precursor tweed structures due to magnetic tweed contrast when the 'Fe' concentrations are 8% and 11%. In case of 11% 'Fe' substituted alloy martensite phase was found to from at the grain boundary triple junctions. Thermo magnetic measurements determine that, as the 'Fe' concentration increases from 2 to 11%; it enhances the magnetic transition temperature from 375 to 403 K.

Original languageEnglish
Title of host publicationNEMS/MEMS Technology and Devices - Selected, peer reviewed papers from the International Conference on Materials for Advanced Technologies 2009, ICMAT 2009
Pages215-218
Number of pages4
DOIs
Publication statusPublished - 2009
Externally publishedYes
EventInternational Conference on Materials for Advanced Technologies, ICMAT 2009 - Singpore, Singapore
Duration: Jun 28 2009Jul 3 2009

Publication series

NameAdvanced Materials Research
Volume74
ISSN (Print)1022-6680

Conference

ConferenceInternational Conference on Materials for Advanced Technologies, ICMAT 2009
Country/TerritorySingapore
CitySingpore
Period6/28/097/3/09

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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