| Relation between martensitic transformation temperature range and lattice distortion ratio of NiMnGaCoCu Heusler alloys |
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| 作者姓名： | 韦俊 谢忍 陈乐易 唐研梅 许连强 唐少龙 都有为 |
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| 基金项目： | Project supported by the National Key Project of Fundamental Research of China(Grant No.2012CB932304);the National Natural Science Foundation of China(Grant No.U1232210) |
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| 摘 要： | In order to study the relation between martensitic transformation temperature range AT （where AT is the difference between martensitic transformation start and finish temperature） and lattice distortion ratio （c/a） of martensitic transforma~ tion, a series of Ni46Mnz8_xGa22Co4Cux （x = 2-5） Heusler alloys is prepared by arc melting method. The vibration sample magnetometer （VSM） experiment results show that AT increases when x 〉 4 and decreases when x 〈 4 with x increasing, and the minimal AT （about 1 K） is found at x = 4. Ambient X-ray diffraction （XRD） results show that AT is proportional to c/a for non-modulated Ni46Mn28_xGa22Co4Cux （x = 2-5） martensites. The relation between AT and c/a is in agreement with the analysis result obtained from crystal lattice mismatch model. About 1000-ppm strain is found for the sample at x = 4 when heating temperature increases from 323 K to 324 K. These properties, which allow a modulation of AT and temperature-induced strain during martensitic transformation, suggest Ni46Mn24Ga22Co4Cu4 can be a promising actuator and sensor.
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| 关 键 词： | 马氏体相变 温度范围 哈斯勒合金 晶格 振动样品磁强计 畸变率 X射线衍射 相变过程 |
Relation between martensitic transformation temperature range and lattice distortion ratio of NiMnGaCoCu Heusler alloys |
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| Abstract: | martensitic transformation temperature range, lattice distortion ratio, martensitic transformation |
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| Keywords: | martensitic transformation temperature range lattice distortion ratio martensitic transformation |
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