Effect of Structure Transformation on The Mechanical and Electrical Behaviour for (Pb- 1.5 Wt 0/o Sb) Alloy

Abstract

The transient and steady state creep parameters of (Pb-1.5 wt % Sb) and (Pb-1.5w% Sb-0.2 w %Sn) alloys are determined in the temperature range from (403 to 473) K. The transient creep parameters fJ and n change with ageing temperature and applied stress. The strain rate sensitivity parameter (m) for (Pb- 1.5 wt % Sb) was found to change from (0.11 to 0.35), while for the another alloy it was found to change from (0.18 to 0.28). The activation energies of both transient and steady state creep are calculated. The steady state activation energy is found to be stress dependent. The x-ray analysis supports that the residual internal lattice strain at the transformation temperature 443Kfor (Pb -1.5 wt% Sb), while it was 433K for ( Pb - 1.5 wt % Sb - 0.2 wt% Sn ). The isothermal resistivity ratio p/ Po also investigate and the value of activation energy was found to range from (0.07 to 0.12) eV for(Pb-1.5wt%Sb),while for the another alloy was found to be from (0.14 to 0.2) eV. The electron microscopy was also studied which gives results in good agreement with the above studies.