[ij] [ij] [ij] 
Email id

Journal of Metallurgy and Materials Science
Year : 2009, Volume : 51, Issue : 3
First page : ( 197) Last page : ( 203)
Print ISSN : 0972-4257. Online ISSN : 0974-1267.

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

Singh Satnam, Mitra A., Panda A. K.*

National Metallurgical Laboratory, (CSIR), Jamshedpur-831007, India.

*Corresponding Author Email: akpanda@nmlindia.org


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.



Ferromagnetic shape memory alloy, Melt spun ribbon, Martensitic transformation, Curie temperature.


║ Site map ║ Privacy Policy ║ Copyright ║ Terms & Conditions ║ Page Rank Tool
762,820,929 visitor(s) since 30th May, 2005.
All rights reserved. Site designed and maintained by DIVA ENTERPRISES PVT. LTD..
Note: Please use Internet Explorer (6.0 or above). Some functionalities may not work in other browsers.