Comparative Analysis of Stress Jumps in Metals and Intermetallic Compounds: I. Description of Two-Stage Straining

The Cottrell-Stokes two-stage straining of fcc metals and intermetallic compounds whose yield stress exhibits an anomalous temperature dependence is analyzed theoretically. The magnitude of stress jumps brought about by changes in temperature is expressed via characteristics of dislocation transformations to shortand long-lived barriers. The manner in which the thermally activated blocking of dislocation sources affects the magnitude of stress jumps in intermetallic compounds is investigated. Several alternative combinations of conditions are discussed, under which stressjumps similar to those observed in metals occur in intermetallic compounds with changing temperature.