Abstract
The precipitation reactions in Ni-11.1 at.% Al and Ni-13.8 at.% Al alloys at 425 and 450°C were investigated by measuring the change in the Curie temperature and form of the magnetization vs. temperature curve during aging. While the reaction goes essentially to completion in the 11.1 at.% Al alloy, it does not in the more concentrated alloy. Further, the magnitude of the maximum slope of the magnetization vs. temperature curve decreases with initial aging snowing that the magnetic phase has become highly inhomogeneous. The 13.8 at.% Al alloy is thought to decompose via fluctuations which are large in extent but small in degree, i.e. spinodal decomposition or Cahn—Hilliard non-classical nucleation. There is evidence for two stage precipitation in the 11.1 at.% Al alloy. A precipitate which is ferromagnetic at 77°K appears to precede the stable phase, γ', Ni 3Al, which was presumed to be the second stage precipitate.
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