PHYSICO-CHEMICAL MODELING OF ATOMIC INTERACTIONS AND OPTIMIZATION OF THE HYPOEUTECTIC SILUMIN AK7CH MICROALLOYING

Annotation. Purpose. Prediction of the strontium and scandium microalloying effect on the formation of the structure and properties of the hypoeutectic silumin AK7ch on the basis of an atomic interaction analysis of the investigated alloy. Methodology. The analysis of paired atomic interactions was carried out in accordance with E.V. Prikhodko's method. In the analysis of pair interactions, the mathematical tool of physico-chemical modeling was used. Peculiarities of pair bonds were studied taking into account the changes introduced by oxygen in an amount of 0.001% and micro additions of strontium and scandium in the range: Sr 0.1, 0.2, 0.3%; Sc 0.2, 0.4, 0.6%. The alloy structure and properties data was determined by standard methods. Originality. The development of a model of paired interatomic bonds for the AK7ch alloy with Sr and Sc as microalloying additives was carried out for the first time. Practical value. The analysis allows to show the adequacy of calculation of the degree of directivity of pair bonds (metallization) in the alloy and experimental data on the effectiveness of these elements, and also to specify the optimum concentration of modifier elements to achieve a high complex of mechanical properties of the material.