Magnetic and structural evolution in Ni-rich off-stoichiometric NiMnGa melt spun ribbons

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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Abstract

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.

Item Type:Article
Official URL/DOI:http://www.indianjournals.com/ijor.aspx?target=ijo...
Uncontrolled Keywords:Ferromagnetic shape memory alloy, Melt spun ribbon, Martensitic transformation, Curie temperature
Divisions:Material Science and Technology
ID Code:1207
Deposited By:Dr. A K Sahu
Deposited On:07 Jul 2010 12:58
Last Modified:18 Oct 2011 14:15
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