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Multiple martensitic transformation peaks were observed from differential scanning calorimetry curves in aged Mn50Ni25Ga25 alloys in which transformation temperature varied with aging temperature. The magnetization and coercivity were enhanced as a result of aging above magnetic transition temperature. A maximum magnetization up to 54 emu/g and a magnetization difference between two phases of 28 emu/g was achieved in the alloy aged at 873 K. However, coercivity as large as 1.2 kOe was obtained in 573 K aged alloy, with a high saturation field, which can be understood in terms of domain wall pinning. [ABSTRACT FROM AUTHOR]