Abstract
Ni56FexGa44-x(15 ≤ x ≤ 20)alloys were stud-ied with the phase structure and magnetic properties.The martensitic transformation was observed over the whole composition range.The martensitic transformation starting temperature(Ms)increases from 256 K for x=15 to 350 K for x=18 and then decreases from 350 K for x=18 to 333 K for x=20 by increasing substitution of Fe for Ga.The austenitic Curie temperature(TAC)is observed for 15 ≤ x ≤ 16 and 18 ≤ x ≤ 20,respectively.And the martensitic Curie temperature(TMC)is observed for x=17.For 18＜x＜20,the austenitic Curie temperature(TAC)is detected at about 499 K,resulting in a relationship between martensite transformation temperature and Curie tempera-ture as TAC＜Ms.For x=17,the relationship between martensite transformation temperature and Curie tempera-ture is TAC＜Ms.
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