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The relation of martensitic transformation temperature range and lattice distortion ratio of NiMnGaCoCu Heusler alloys |
| 1,shaolong tang |
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Abstract In order to study the relation between martensitic transformation temperature range ΔT(where ΔT is the difference of martensit transformation start and finish temperature) and lattice distortion ratio (c/a) of martensitic transformation, a series of Ni46Mn28-xGa22Co4Cux (x= 2-5) Heusler alloys were prepared by arc melting method. The vibration sample magnetometer (VSM) experiment results show that ΔT increases when x>4 and decreases when x<4 with x increasing, and the minimal ΔT (about 1 K) is found at x= 4. Ambient x-ray diffraction (XRD) results show that ΔT is proportion to c/a for non-modulated Ni46Mn28-xGa22Co4Cux (x= 2-5) martensite. The relation between ΔT and c/a is agreement with the analysis result of crystal lattice mismatch model. About 1000 ppm strain were found for the sample at x=4 when heating from 323 to 324 K. These properties which allow a modulation of ΔT and temperature-induced strain during martensitic transformation suggest Ni46Mn24Ga22Co4Cu4 can be the promising actuators and sensors.
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Received: 05 September 2013
Published: 31 October 2013
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| Fund: The national S&T major project of China;The independent research and development fund of Tsinghua university |
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Corresponding Authors:
shaolong tang
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Cite this article:
shaolong tang The relation of martensitic transformation temperature range and lattice distortion ratio of NiMnGaCoCu Heusler alloys Chin. Phys. B 0
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