Abstract
The effect of structure transformations on the stress–strain characteristics of Al–10 wt%Ag and Al–10 wt%Ag–0.2 wt%Ti alloys has been studied in the temperature range from 503 to 573 K for both quenched and slowly cooled specimens. The coefficient of work-hardening, χ = ∂ σ 2/∂ ɛ (as Mott's model); the fracture time, t f; yield stress, σ y; fracture stress, σ f; Young's modulus, Y, decreased with increasing aging temperature ( T a) and exhibited an abrupt increase at about 543 K. On the other hand, for each curve the fracture strain, ɛ f, and the strain hardening exponent, n, increased with increasing aging temperature and exhibited minimum at about 543 K. The Ti-free samples were generally harder than the ternary samples. It was found that the addition of Ti to Al–10 wt%Ag alloy accelerates the precipitations of γ′ and γ-precipitates. The activation energy of the fracture mechanism in both alloys was around 25 ± 0.4 and 51.7 ± 0.4 kJ/mol before and after transformation, respectively. The microstructure of the samples studied was investigated by transmission electron microscopy (TEM).
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