✍ Scribed by S.Y. Yu; B. Schönfeld; H. Heinrich; G. Kostorz
No coin nor oath required. For personal study only.
A single crystal of Ag-36.7 at.% Al aged within the hexagonal close-packed (h.c.p.) d-phase region of the phase diagram at 366 K was investigated by diffuse X-ray scattering. Diffuse scattering maxima were found at 2k F positions where k F is the Fermi wave number along h1 1 0. The contributions from short-range order scattering, linear size-effect scattering, Huang scattering and thermal diffuse scattering were separated by least-squares fitting of the corresponding Fourier series. In crystals modeled on the basis of 40 Warren-Cowley shortrange order parameters, nearest-neighbor configurations are found which are characteristic of a superstructure introduced by Neumann as a possible ground-state structure of h.c.p. Ag-Al. Effective pair interaction parameters of the first 12 shells determined by the inverse Monte Carlo method were used in Monte Carlo simulations. For the Neumann structure, an orderdisorder transition temperature of $ 100 K is estimated.
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