Martensitic transformation in Cu-doped NiMnGa magnetic shape memory alloys |
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Authors: | Li Pan-Pan Wang Jing-Min and Jiang Cheng-Bao |
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Institution: | Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing 100191, China |
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Abstract: | This paper studies the martensitic transformation in the Cu-doped NiMnGa alloys. The orthorhombic martensite transforms to L21 cubic austenite by Cu substituting for Ni in the Ni50-xCuxMn31Ga19 (x=2--10) alloys, the martensitic transformation temperature decreases significantly with the rate of 40 K per Cu atom addition. The variation of the Fermi sphere radius (kF) is applied to evaluate the change of the martensitic transformation temperature. The increase of kF leads to the increase of the martensitic transformation temperature. |
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Keywords: | shape memory alloys martensitic phase transformation NiCuMnGa |
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