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用真空快淬炉制备了名义成分为Ni50 Mn2 7Ga2 3,淬速分别为 2 ,4 ,8m s的快淬态试样 ,并将部分试样热处理 .研究结果表明 ,与铸态相比 ,快淬态试样马氏体相变温度、居里温度均有所降低 ,经热处理后 ,降低的马氏体温度和居里温度会提高 .快淬合金与铸态合金相比更容易获得单相的Ni2 MnGa结构 ,并能使合金主衍射峰从 (2 2 0 )转向(4 0 0 ) ,形成织构 ,热处理后织构消失 .快淬工艺对相变应变和磁致应变的影响表现出复杂性 ,研究发现获得织构的快淬带具有较浇铸态试样更大的相变应变和磁致应变 .
The quenched samples with Ni48Mn2 7Ga2 3 nominal composition and quenching speeds of 2, 4 and 8 m s respectively were prepared by vacuum quenching furnace, and some samples were heat-treated.The results show that compared with as-cast, The martensitic transformation temperature and the Curie temperature of the quenched samples are both decreased, and the decreased martensite temperature and Curie temperature will be increased after the heat treatment.The quenched alloys are easier to obtain single phase than the as-cast alloys Ni2MnGa structure and the main diffraction peak can be changed from (2 2 0) to (4 0 0) to form texture, and the texture disappears after heat treatment.The effect of quenching process on the phase transformation strain and magnetotactic strain shows Complexity, the study found that the obtained structure of the quenched zone has a larger phase transition strain and magnetic strain than the cast sample.