The decomposition process of 10Ni maraging steel during the early stages of aging has been studied by small angle X-ray scattering. From the analyses of the integrated intensity and the application of Porod's law, it is suggested that spinodal decomposition takes place at the early stages of aging in this alloy. The decomposition kinetics were also studied by the determination of the amplification factor. The spinodal temperature was estimated to be about 853 K.
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