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Dynamic strain aging(DSA)is an important phenomenon in solute hardened metals and seri-ously affects the mechanical properties of metals.DSA is generally induced by the interaction between themoving dislocations and the mobile solute atoms.In this paper,only the interaction between moving disloca-tions and mobile solute atoms in a dislocation core area(core atmosphere)will be taken into account.To es-rablish the constitutive model which can describe the DSA phenomenon,we improved the Zerilli-Armstrongdislocation-mechanics-based thermal viscoplastic constitutive relation,and added the effect of the interactionbetween the moving dislocations and core atmosphere.Because the constitutive relation estabhshed is basedon the Zerilh-Armstrong relation,it can describe not only the DSA phenomenon,but also the mechanical be-havior of metals over a broad range of temperatures(77K～1000K)and strain rate(10~(-4)～10~4 s~(-1)).Themodel prediction for tantalum fits well with the experimental data.
Dynamic strain aging (DSA) is an important phenomenon in solute hardened metals and serially ously affects the mechanical properties of metals. DSA is generally induced by the interaction between themoving dislocations and the mobile solute atoms. In this paper, only the interaction between moving disloca-tions and mobile solute atoms in a dislocation core area (core atmosphere) will be taken into account. Toes-rablish the constitutive model which can describe the DSA phenomenon, we improved the Zerilli-Armstrongdislocation-mechanics-based thermal viscoplastic constitutive relation , and added the effect of the interactionbetween the moving dislocations and core atmosphere.Because the constitutive relation estabhshed is basedon the Zerilh-Armstrong relation, it can can not only the DSA phenomenon, but also the mechanical be-havior of metals over a broad range of temperatures (77K ~ 1000K) and strain rate (10 ~ (-4) ~ 10 ~ 4 s ~ (-1)). Themodel prediction for tantalum fits well with the experimental data.