Abstract
The effect of isothermal aging on the physical properties of Mn53Ni25Ga22 alloy has been systematically investigated. The results showed that the (Mn,Ni)4Ga-type precipitates are observed in all isothermal aged samples. However, second phases tended to align into grains and had two preferred orientations. The martensitic transformation temperatures decreased remarkably with the increase of aging time, while structure of the alloy gradually changed from five-layer tetragonal martensite to austenite. Additionally, we found that the appropriate aging-treated alloys can significantly enhance the saturation magnetization of Mn53Ni25Ga22 alloy. However, the Curie temperatures decreased remarkably with increased aging time due to the variation of the composition of the alloy.
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