The glide of an ensemble of edge dislocations at the high-speed deformation of an aged binary metal alloy is theoretically analyzed. The yield stress of the alloy is a nonmonotone function of the second component concentration, which has a maximum and a minimum under certain conditions. The maximum corresponds to the transfer from the dominating influence of dislocation collective interaction on creation of a spectral gap to the prevalence of the influence of collective interaction of atoms of the second component. The minimum of the obtained curve corresponds to the transfer from the prevalence of the drag of the dislocation by the Guinier–Preston zones to the prevalence of its drag by the atoms of the second component.

The above-barrier motion of edge dislocations under high-energy impacts on binary alloys containing Guinier-Preston zones is theoretically analyzed. It is shown that in the case of high strain rate deformation of such alloys, the dependence of the yield strength on the dislocation density deviates from the Taylor relation and is a nonmonotonic function with a maximum. The position of the maximum corresponds to the density of dislocations, at which their contribution to the formation of the spectral gap becomes dominant.

The dynamics of dislocations in aged aluminum–copper alloys under high-rate deformation conditions has been studied. An analytic expression for the dynamic yield stress of these alloys is obtained and it is established that its dependence on the copper concentration is nonmonotonic and has a minimum.

Теоретически исследовано скольжение краевых дислокаций в состаренном бинарном сплаве в условиях высокоскоростной деформации (high strain rate deformation). Получено аналитическое выражение для скоростной зависимости динамического предела текучести. Получены условия, при которых график скоростной зависимости может иметь два максимума и два минимума. Существование двух максимумов связано с наличием двух типов дефектов, значительно отличающихся своими размерами (атомы второго компонента и зоны Гинье-Престона). Минимумы имеют место при переходе от доминирования динамического торможения (drag) одним типом дефектов к доминированию дефектов другого типа. Максимумы возникают при изменении характера торможения доминирующими дефектами. Ключевые слова: дислокации, высокоскоростная деформация, дефекты, зоны Гинье-Престона.

The sliding of an ensemble of edge dislocations under high-speed deformation (high strain rate deformation) of an aged binary alloy is theoretically analyzed. An analytical expression of the dependence of the dynamic yield strength on the dislocation density is obtained. The conditions under which this dependence is nonmonotonic and has a minimum and maximum are obtained. The minimum occurs during the transition from the dominance of dynamic braking (drag) of dislocations by point defects to the dominance of braking by other dislocations (Taylor hardening). The position of the maximum corresponds to the value of the dislocation density, at which their contribution to the formation of the spectral gap becomes dominant.