Abstract
The phase relation and microstructure of alloys based on the Ni 3Al–Ni 3Nb–Ni 3V pseudo-ternary alloy system at 1273 and 1373 K were investigated by optical microscopy, X-ray diffraction, and scanning electron microscopy (attached with a wavelength dispersive spectroscope). There was no other intermediate phase besides L1 2 (Ni 3Al), D0 a (Ni 3Nb) and D0 22 (Ni 3V). The phase fields of L1 2 (Ni 3Al), D0 a (Ni 3Nb) and D0 22 (Ni 3V) have been shown to primarily depend upon the free electron concentration ( e/ a) of the constituent atoms. Among the three constituent intermetallic phases, one kind of three-phase relation (i.e. L1 2–D0 a –D0 22) and three kinds of two-phase relations (i.e. L1 2–D0 a , D0 a –D0 22 and L1 2–D0 22) were found to exist at 1273 K. The prepared alloys exhibited widely different microstructures, depending on alloy composition and temperature. In the low Nb concentration region, dual multi-phase microstructures composed of L1 2+D0 a +A1(→L1 2+D0 22) were formed by a eutectic reaction.
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