On the lattice structure of high-purity aluminium

An Interdisciplinary Approach to Fracture of Solids from the Standpoint of Condensed Matter Physics

“…The observed minimum of residual strain during the period of steady creep is associated with the achievement of the maximum hardness of the material. The change in hardness over time of alloys similar in composition was studied in [20][21][22][23] and others. The time to reach a certain state of the alloy in the process of transformation, which occurs due to thermal activation, is determined by a typical expression of the theory of the rates of processes [24] 0 exp…”

“…In the case of an additional increase in the number of precipitation centers due to a greater concentration of vacancies, the pre-exponential multiplier in (20) should include a multiplier expression that takes into account the temperature of the cooling medium during quenching [18]. At this temperature, the equilibrium concentration of vacancies has time to be established [20], and in this form this expression can participate in the calculations of the aging process at low temperatures and in the description of the recovery process. The characteristic maximum hardness of isolate-aged alloys and the corresponding minimum of plasticity make it possible to estimate the activation parameters in the expression (20).…”

“…At this temperature, the equilibrium concentration of vacancies has time to be established [20], and in this form this expression can participate in the calculations of the aging process at low temperatures and in the description of the recovery process. The characteristic maximum hardness of isolate-aged alloys and the corresponding minimum of plasticity make it possible to estimate the activation parameters in the expression (20).…”

“…By equating the failure time (4) and the time to reach the minimum of the residual creep strain (20) obtained under certain loading conditions (Fig. 9), it is possible to estimate the parameters included in (20). Having the parameters of (20), we obtain an expression for the conditional rate of the precipitation process 1/ p p V = τ , the integral of which in time will give one when the second hardness maximum is reached.…”