Abstract
Planar misfit between fcc and fct and elastic anisotropy in a cubic crystal were examined to understand the crystallographic relationship between the ordered domain and the matrix in the ordering of an AuCu alloy. The results of these calculations did not indicate any definite conjugate plane between the ordered phase and surrounding matrix. A model modified from the crystallization phenomena in amorphous alloys was proposed to understand the ordering in the AuCu alloy. According to the model, the degree of order can be varied from the surface of the ordered domain to the matrix with some area of transitional region, i.e. without any defined interface. This leads to the conclusion that the idea of a specific habit plane is meaningless for understanding the initiation of the AuCu ordering. The validity of the model was supported by the direct observation of the initial stage of precipitation in an Al-Li alloy.
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