Ranjan, Rajeev ; Singh, Sanjay ; Boysen, Hans ; Trots, Dmytro ; Banik, S. ; Awasthi, A. M. ; Mukhopadhyay, P. K. ; Barman, S. R. (2009) Competing tetragonal and monoclinic phases in Ni2.2Mn0.80Ga Journal of Applied Physics, 106 (3). 033510_1-033510_8. ISSN 0021-8979
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Official URL: http://jap.aip.org/resource/1/japiau/v106/i3/p0335...
Related URL: http://dx.doi.org/10.1063/1.3190527
Abstract
Temperature dependent synchrotron x-ray powder diffraction, differential scanning calorimetry, and magnetic measurements were performed on Ni2+xMn1−xGa (x = 0.20 and 0.35) magnetic shape memory alloys. For x = 0.20, though the monoclinic phase is thermodynamically stable, a trace of residual stress can stabilize a tetragonal phase. The residual-stress-induced tetragonal phase transforms to the cubic austenite phase over an unusually large temperature range (348 K ≤ T ≤ 693 K), suggesting extremely slow kinetics of transformation. In contrast to x = 0.20, the thermodynamically stable phase of x = 0.35 is tetragonal and this composition exhibits the usual features of a reversible martensitic transformation. The results suggest that for x = 0.20 the monoclinic and tetragonal phases are nearly degenerate.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to American Institute of Physics. |
| Keywords: | Differential Scanning Calorimetry; Ferromagnetic Materials; Gallium Alloys; Magnetic Transitions; Manganese Alloys; Nickel Alloys; Reverse Martensitic Transformations; Shape Memory Effects; Solid-state Phase Transformations; Thermodynamics; X-ray Diffraction |
| ID Code: | 64598 |
| Deposited On: | 12 Oct 2011 05:23 |
| Last Modified: | 12 Oct 2011 05:23 |
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