TY - JOUR
T1 - Microstructure and magnetic properties of Ni2(Mn,Fe)Ga heusler alloys rapidly solidified by melt spinning
AU - Prasad, R. V.S.
AU - Srinivas, M.
AU - Manivel Raja, M.
AU - Phanikumar, G.
N1 - Funding Information:
The authors thank the licuri artisans from Santa Br?gida Artisans Association, the Lear's Macaw Association from Chuqu? and the Association of Lear Handicrafts from Serra Branca for their active participation in this research. Regards to Mr. Edinalvo Santos for permission to use the Lear's Macaw pictures (a-c). Additionally, thanks to the NGO Environmental Conservation Organization (ECO) for the very important logistical and operational support during field activities, and its partners: Lymington Fundation, Loro Parque Fundaci?n, The Parrot Society UK, Blue Macaws, Phoenix Landing, Parrots International, American Federation of Aviculture, The Parrots Fund and Emerald Feathers and the Nutropica Company. Thanks to the Institute Chico Mendes for the Conservation of Biodiversity (ICMBio) for the logistical support, the Bahia State University for the PAC scholarship for the first author and to the CAPES for the financial support - Process PROAP # 23038.008230/2010-75.
PY - 2014/4
Y1 - 2014/4
N2 - The microstructure and magnetic properties of Ni2MnGa base alloys with "Fe" substitution in place of "Mn" are studied. The processing technique used is melt spinning at wheel speeds of 20 m/s and 30 m/s followed by annealing at 1273 K (1000 °C) for 1 hour. Fe content is varied from 2 at. pct to 11 at. pct for alloys of Ni50Mn (25-x)Fe x Ga25 with Heusler stoichiometry. Austenite with B2 partial atomic ordering and premartensitic tweed structures were found at room temperature for all the alloys at different wheel speeds. After annealing at 1273 K (1000 °C) for 1 hour, austenite phase with L2 1 Heusler atomic ordering is stabilized in samples of all the processing conditions. Saturation magnetization, martensitic transformation temperature, and Curie temperature are measured. Martensite temperature and Curie temperature increase in proportion to iron content in the alloy. Saturation magnetization is sensitive to the phase content and compositional inhomogeneities.
AB - The microstructure and magnetic properties of Ni2MnGa base alloys with "Fe" substitution in place of "Mn" are studied. The processing technique used is melt spinning at wheel speeds of 20 m/s and 30 m/s followed by annealing at 1273 K (1000 °C) for 1 hour. Fe content is varied from 2 at. pct to 11 at. pct for alloys of Ni50Mn (25-x)Fe x Ga25 with Heusler stoichiometry. Austenite with B2 partial atomic ordering and premartensitic tweed structures were found at room temperature for all the alloys at different wheel speeds. After annealing at 1273 K (1000 °C) for 1 hour, austenite phase with L2 1 Heusler atomic ordering is stabilized in samples of all the processing conditions. Saturation magnetization, martensitic transformation temperature, and Curie temperature are measured. Martensite temperature and Curie temperature increase in proportion to iron content in the alloy. Saturation magnetization is sensitive to the phase content and compositional inhomogeneities.
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U2 - 10.1007/s11661-013-2124-x
DO - 10.1007/s11661-013-2124-x
M3 - Article
AN - SCOPUS:84898826899
SN - 1073-5623
VL - 45
SP - 2161
EP - 2170
JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
IS - 4
ER -