Supposing that transition to quasimetallic state occurs in silicon at heating well below melting point, behaviour of different physical characteristics including specific elongation, thermal expansion coefficient, enthalpy, heat capacity, specific resistance, life time of non-basic charge carriers, hardness and internal friction versus temperature were investigated. Non-monotonous behaviour of all features evidently shows that silicon forms different lattices in specific temperature intervals. Thermal effect accompaning phase transition was measured. At heating and cooling enthalpy change is characterised by hysteresis, value change and widening over temperature range. The characteristic behaviour versus temperature, thermal effect value and structural changes allow to classify phase transitions in silicon as shear type occuring by atoms displacement over small distances. Silicon allotropy under pressure typical for metallurgical procasses causes existence of four silicon allotropic forms in Al - Si alloys and phase transformations with participation of those phases. The phase diagram accounting for silicon ellotropy was drawn on the base of experimental data. The mechanism of mecroalloying in Al - Si alloys was studied in details. New high strength corrosion resistant Al - Si alloys were developed. The data obtained gives the possibility to control silicon electrophysical properties to prescribed range.

• Куцова Валентина Зиновіївна (1939–) (технічні науки)

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