Abstract
The local atomic arrangement in the γ Ni-Al solid solution and its evolution with temperature and concentration are investigated in quenched samples by X-ray diffuse scattering. The value of the first Warren-Cowley parameter indicates strong short range order, but the other parameters decrease rapidly. Both the amount and range of the short range order increase with aluminium content and decrease with increasing temperature. The pair interaction potentials are determined in the Ising model through an inverse cluster variation method (ICVM). From these pairwise interaction potentials the virtual ordering temperature for Ni 3Al is estimated, as well as antiphase boundary energies. They are compared to available experimental results.
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