Header menu link for other important links
Enhancement in magnetocaloric properties of NiMnGa alloy through stoichiometric tuned phase transformation and magneto-thermal transitions
S. Dey, R.K. Roy, M. Ghosh, A. Basu Mallick, , A.K. Panda
Published in Elsevier B.V.
Volume: 439
Pages: 305 - 311
The investigation is focussed on phase generation and magnetocaloric properties of a series of Ni77-XMnXGa23 (x = 22, 23, 24, 25, 27) alloys prepared through arc melting furnace. With increase in Mn content, the alloys showed systematic transition from a non-modulated martensite (NM) to a fully austenitic parent phase through an appearance and coexistence of modulated (M) structure. Intermediate Mn containing alloy (#Mn24) not only displayed high magnetic entropy change (ΔSM) of −7.7 J/kg−1K−1 but also large Refrigerant Capacity (RC) of 169 J.Kg−1 at magnetic field change of 3 T compared to other alloys. The coexisting martensite (NM, M) and parent austenite as well as overlapping thermomagnetic and structural transformation was deliverable through tuning of alloy chemistry wherein Ni was systematically substituted by Mn. Transmission electron microscopy (TEM) supported the proposition with existence of martensite plates of different morphology in Mn24 alloy exhibiting superior magnetocaloric properties. © 2017 Elsevier B.V.
About the journal
JournalData powered by TypesetJournal of Magnetism and Magnetic Materials
PublisherData powered by TypesetElsevier B.V.