Effect of structure transformation on the stress–strain characteristics of Pb–3wt% Sb and Pb–3wt% Sb–1wt% Sn alloys

Abstract

Listen

Translate article

The stress–strain characteristics of both Pb–3wt% Sb and Pb–3wt% Sb–1wt% Sn alloys were investigated in the temperature range from 473 to 533 K. The work hardening coefficient, χ=∂ σ 2/∂ ε, the yield stress, σ y, the fracture stress, σ f, and fracture time, t f, generally decrease with increasing deformation temperature. On the other hand, the fracture strain, ε f, and dislocation slip distance, L, increased with increasing deformation temperature. The two observed temperature regions around the transformation temperature (503 K) which characterize the magnitude of variation of these parameters point to two fracture mechanisms activated with 19.7±0.5 and 41.3±0.5 kJ/mol for the low and high temperature region, respectively. The microstructures of the samples under investigation have been examined after stress–strain deformation by X-ray diffraction analysis.