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The effect of austenite aging at 823 K on the microstructures and martensitic transformation behavior of Co46Ni27Ga27 alloy has been investigated using optical microscopy (OM),transmission electron microscopy (TEM),X-ray diffraction analysis (XRD),and differential scanning calorimeter (DSC).The microstructure observation results show that the unaged Co46Ni27Ga27 alloy is composed of the tetragonal nonmodulated martensite phase and face-centered cubic γ phase.It is found that a new nanosized fcc phase precipitates in the process of austenite aging,leading to the formation of metastable age-affected martensite around the precipitates with composition inhomogeneity.Two-stage reverse martensitic transformation occurs in the samples aged for 2 and 24 h due to the composition difference between the age-affected martensite and the original martensite.For the Co46Ni27Ga27 alloy aged for 120 h,no reverse transformation can be detected due to the disappearance of the metastable age-affected martensite and the small latent heat of the original martensite.The martensitic transformation temperatures of the Co46Ni27Ga27 alloy decrease with an increase in aging time.

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