Abstract
Measurements have been made of changes in some physical properties of quenched alloys of 70% Au-30% Ni when they were annealed at low temperatures. Changes in the electrical resistance, volume, and Young's modulus were observed to occur. They indicate that there is at least one metastable precipitate formed on low temperature annealing; it occurs about 10 4 times earlier than the main phase change which has been well studied previously. There is a critical temperature above which this low temperature phase is unstable; this is about 225°C. Exact description of the low temperature phase is not possible, but it does seem to be either (1) clusters of Au-rich or Ni-rich atoms or (2) regions of high geometrical order. Quenched-in vacancies are presumed to control the rate of the reaction but the precipitate is not thought to be simply clusters of vacancies.
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