Singh, Satnam and Mitra, A and Panda, A K (2009) Magnetic and structural evolution in Ni-rich off-stoichiometric NiMnGa melt spun ribbons. Journal of Metallurgy and Materials Science, 51 (3). pp. 197-203.
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The investigation is focussed on the magnetic and structural behaviour in a Ni-rich off-stoichiometric NiMnGa alloy. The Ni55Mn22Ga25 (at %) alloy prepared in the form of melt-spun ribbon showed martensitic structure in its as-cast state. Differential scanning calorimetric (DSC) heating and cooling cycles revealed austenitic (AS=406K) and martensitic (MS=415K) transformation temperatures respectively which were above room temperature. The Curie temperatures obtained from thermo-magnetic experiments were found to be below these transformation temperatures. The as-spun ribbons revealed low fraction of L21 of austenitic phase with a predominant tetragonal (5M) martensite in combination with martensite of higher modulations (7M, orthorhombic). Magnetic coercivity and saturation magnetisation also evidenced the magnetic transitions during ferromagnetic martensite/austenite to paramagnetic austenite.
|Uncontrolled Keywords:||Ferromagnetic shape memory alloy, Melt spun ribbon, Martensitic transformation, Curie temperature|
|Divisions:||Material Science and Technology|
|Deposited By:||Dr. A K Sahu|
|Deposited On:||07 Jul 2010 12:58|
|Last Modified:||18 Oct 2011 14:15|
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