Abstract
Work-hardening rates, h, and recovery rates, r, were measured during the steady-state tensile deformation of pure lead at temperatures between 301 K (0.50Tm) and 385 K (0.64Tm) under nominal strain-rates ranging from 1.2×10−6 s−1 to 2.4×10−4 s−1. Values of h were determined from the results of strain-rate change tests using an extrapolation technique. The value of h depends on stress and also on temperature. Values of r were determined from the results of stress-relaxation tests. The activation energy for the recovery is only 60% of that for the steady-state deformation. These results suggest the necessity of thorough re-consideration of the mechanisms proposed for “so-called” recovery creep, which is typical creep behavior of pure metals at high temperatures.
