Effect of Co on the martensitic transformation,crystal structure and magnetization of Ni52.5Mn23.5Ga24 based ferromagnetic shape memory alloys |
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| Authors: | ShaoMeng Yan Jian Pu Bo Chi Jian Li |
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| Affiliation: | (1) Institute of Applied Mechanics, University of Stuttgart, Stuttgart;(2) Department of Aerospace Engineering, Texas A&M University, Texas; |
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| Abstract: | Five (Ni52.5Mn23.5Ga24)100−x Co x (x = 0, 2, 4, 6, 8) alloys were prepared by arc melting, and the effects of Co addition on the martensitic phase transformation, crystal structure and magnetization were investigated. The phase transformation temperatures M s, M f, A s and A f are proportional to the content of Co in the (Ni52.5Mn23.5Ga24)100−x Co x alloys, which appears to be due to the variation in the valance electron concentration. The Curie temperature is sensitive to the composition of the alloy. As the amount of Co changes, both the Co-Mn exchange interaction and the distance between Mn atoms change. These, in turn, affect the Curie temperature and magnetization behavior of the alloy. The martensite phases in all the alloys are domained in three different orientations, the domain boundary was determined to belong to the family of {1 1 2} lattice planes. |
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| Keywords: | Ni-Mn-Ga alloy Martensitic transformation domain boundary Curie temperature magnetization |
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