Formation and growth kinetics of intermediate phases in Ni-Al diffusion couples

Abstract

Formation and growth of the intermediate phases in the Ni-Al diffusion couples prepared by pouring technique were investigated. Electron probe microanalysis, scanning electron microscopy and X-ray diffraction were used to characterize the product phases in the joints. The results show that two intermediate phases form in the sequence of NiAl₃ and Ni₂Al₃ during solidification. After annealed, Ni₂Al₃ and NiAl₃ still exist in the joints of the couples. The reasons for the formation of Ni₂Al₃ and NiAl₃, as well as the absence of NiAl, Ni₅Al₃ and Ni₃Al were discussed, respectively. The growth kinetics of both product phase layers indicates that their growth obeys the parabolic rate law. The activation energies and frequency factors for NiAl₃ and Ni₂Al₃ phases were also calculated according to the Arrhenius equation.

Keywords

Ni-Al / diffusion couple / growth kinetics / intermediate phase / parabolic rate law

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