Jain, Deepti ; Banik, Soma ; Sharath Chandra, L. S. ; Barman, S. R. ; Nath, R. ; Ganesan, V. (2010) Domain structures across the martensitic transformation in Ni2+xMn1-xGa Materials Science Forum, 635 . pp. 69-74. ISSN 0255-5476
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Official URL: http://www.scientific.net/MSF.635.69
Related URL: http://dx.doi.org/10.4028/www.scientific.net/MSF.635.69
Abstract
Evolution of domain structures across the martensitic transition (Tm) in the ferromagnetic shape memory alloy system Ni-Mn-Ga is studied using an optical microscope with a temperature variation. Compositions chosen have Tm < Tc, Tm = Tc and Tm > Tc, (Tc=Curie temperature) so that one can compare the nature of martensitic domains. There are no appreciable domain structures when Tm < Tc as compared to the one with Tm > Tc. However, giant morphological changes in the form of appearance of well-developed domains that are propagating with different directions are seen for the composition in which Tm=Tc. The results are discussed in the light of Magnetic Force Microscopy observations as well as giant entropy changes known to occur on samples with co-occurrence of Tm and Tc.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Trans Tech Publications Inc.. |
| Keywords: | Ferromagnetic Shape Memory Alloys (FSMA); MFM; Ni2MnGa; Optical Microscopy |
| ID Code: | 93088 |
| Deposited On: | 12 Jun 2012 08:13 |
| Last Modified: | 12 Jun 2012 08:13 |
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