Abstract
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 (TM) was observed from the magnetization, electrical resistivity and X-ray diffraction studies as functions of temperature below 400 K. We found that TM increases roughly from 280 K to 310K with increasing x from 1.5 to 4. However, the Curie transition (TC) 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 TM and a slope change near TC. We have experimentally demonstrated that the shape memory effect can be occurred at room temperature with a proper concentration variation of Mn and Ga.
Original language | English |
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Journal | Physica Status Solidi. C: Current Topics in Solid State Physics |
Volume | 1 |
Issue number | 12 |
Pages (from-to) | 3579 |
ISSN | 1862-6351 |
DOIs | |
Publication status | Published - 2004 |
Externally published | Yes |