Due to exhibiting giant field-induce strain, the Ni 2 MnGa shape memory alloys are great interest for both scientific researches and industry applications. The non-stoichiometric Ni 50 Mn 25+x Ga 25-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 C ) 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.
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