Abstract
A study of the microstructures of a NiAl base alloy in different conditions was carried out using optical microscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that water quenching from the 1100°C solution temperature cannot restrain the precipitation of Ni 3Al phase at grain boundaries, while liquid nitrogen quenching can restrain the precipitation of Ni 3Al phase effectively. Martensite laths in specimens quenched in liquid nitrogen are twins with the twinning plane of [11̄1̄] and the twinning axis of [211]. On aging of specimens quenched in liquid nitrogen, Ni 3Al precipitates distribute homogeneously among NiAl martensite or at boundaries of martensite laths and the growth rate of precipitates is higher than that in water-quenched specimens.
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