標題: Temperature dependence of magnetic properties in Ni-Mn-Ga shape memory alloys
作者: Lee, MD
Nong, NV
Thuy, NP
Yao, YD
Lee, SF
Liou, Y
Chen, YY
Wang, CR
材料科學與工程學系
Department of Materials Science and Engineering
公開日期: 2004
摘要: Due to exhibiting giant field-induce strain, the Ni2MnGa shape memory alloys are great interest for both scientific researches and industry applications. The non-stoichiometric Ni50Mn25+xGa25-x alloys with x varied from 1.5, 2.5 to 4 have been fabricated by arc-melting. Martensitic transformation temperature for structure transformation from tetragonal to cubic (T-M) was observed from the magnetization, electrical resistivity and X-ray diffraction studies as functions of temperature below 400 K. We found that T-M increases roughly from 280 K to 310K with increasing x from 1.5 to 4. However, the Curie transition (T-M) is roughly at 380 K for all the samples, it is insensitive to the variation of Mn/Ga ratio. The electrical resistivity data exhibit a deep near T-M and a slope change near T-C. We have experimentally demonstrated that the shape memory effect can be occurred at room temperature with a proper concentration variation of Mn and Ga. (C) 2004 WILEYNCH Verlag GmbH & Co. KGaA, Weinheim.
URI: http://hdl.handle.net/11536/18327
http://dx.doi.org/10.1002/pssc.200405510
ISBN: 3-527-40577-1
DOI: 10.1002/pssc.200405510
期刊: SECOND SEEHEIM CONFERENCE ON MAGNETISM, PROCEEDINGS
起始頁: 3579
結束頁: 3582
顯示於類別:會議論文


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