Work hardening characteristics in Al base alloys with 12.6 and 45 wt.% Zn

The stress–strain curves were obtained for Al–Zn alloys of 12.6 wt.% Zn (alloy I) and 45 wt.% Zn (alloy II) with elements of purity (99.99). The monotonic shift of these curves towards lower flow stress and higher ductility was interrupted at the transformation temperatures 483 K (alloy I) and both 543, 603 K (alloy II). By increasing deformation temperature, Young's modulus, Y, yield and fracture stresses, σ y and σ f, respectively, fracture time, t f, the coefficient of parabolic work hardening, χ, decreased while fracture strain, ɛ f, and dislocation slip distance, L, increased. From the obtained X-rays diffraction patterns the lattice strain, ɛ, crystallite size, η, and dislocation density, ρ, were obtained at different deformation temperatures around transformation.