Phase transformations in sputtered Ni-Mn-Ga magnetic shape memory alloy thin films |
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| Authors: | N JettaN Ozdemir S RiosD Bufford I Karaman X Zhang |
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| Affiliation: | a Dept. of Mechanical Engineering, Texas A&M University, College Station, TX 77843-3123, USAb Materials Science and Engineering Program, Texas A&M University, College Station TX 77842-3003, USA |
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| Abstract: | Ni-Mn-Ga magnetic shape memory alloy films have been prepared by the DC magnetron sputtering technique. As-deposited films show a quasi-amorphous structure that crystallizes at ~ 500 K. Crystallization study using Kissinger's analysis reveals a relatively low activation energy indicating partial crystallinity in the films. In situ X-ray diffraction studies show reversible martensite phase transformations, and phase segregation to non-transforming L12 precipitates at higher temperatures. It was observed that the phase segregation can be suppressed by low temperature heat treatment. |
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| Keywords: | NiMnGa Magnetic shape memory alloys Phase segregation In situ x-ray diffraction |
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