Concentration dependences of the electronic density of states near the Fermi level and the Cowley short-range order parameters are presented for the Ag-A1 solid solutions after varius thermomechanical treatments. The density of states is calculated from the data of the electronic heat capacity. The results obtained are analysed alongside with similar results for the Cu-Al solid solutions. It is shown that the electronic density of states decreases with ordering in the alloys. This decrease attains 40% for some alloys and treatments. The concentration dependences of the electronic density of states are non-monotonous. A minimum is observed in the range where the short-range order is essential. The explanation of these results is given in terms of the inhomogeneous order model. According to this model regions with different types of SRO are formed in a-solid solutions. In the ideal case the type of ordering in these regions corresponds to higher concentration phases, while the ordering in the r-solid solution corresponds to a superstructure of LI,-type. The order type of these regions is defined by the temperature and concentration of the alloy. The model explanations are confirmed by calculations based on formulas obtained with the experimentally measured short-range order parameters.

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The analysis of the structural phase state of Fe-Cr low concentration solid solutions and steel 1X13, associated with the formation of short-range order (SRO) of various types in them has been performed at the mesoscopic level. A comparison of the SRO and swelling of alloys under irradiation was carried out. It was shown that there is a fairly good qualitative correlation between them.

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