Recovery of AlMg alloys: Flow stress and strain-hardening properties
- Inst. National Polytechnique de Grenoble, Saint Martin d`Heres (France). Lab de Thermodynamique et Physicochimie Metallurgiques
The recovery of Al-2.5wt% Mg alloys cold-rolled to several strains between 0.1 and 3 has been studied essentially using tensile tests. The yield stress and strain-hardening properties are studied as a function of the initial prestrain, and of the temperature and the duration of annealing treatments. A theoretical model based on the dislocation structure is proposed. The kinetic evolution of the yield stress is related to the variation of the total dislocation density as a single structural parameter. The pseudo-logarithmic time decay is explained on the basis of a relaxation of the internal stresses by thermally activated dislocation motion. A strain-hardening model is proposed based on Kocks` constitutive law of plasticity, where the dislocation storage and dislocation annihilation parameters are adapted to a heterogeneous cell/subgrain dislocation structure. The adjustment of the model to the work-hardening behavior is in agreement with TEM observations.
- OSTI ID:
- 328273
- Journal Information:
- Acta Materialia, Vol. 47, Issue 1; Other Information: PBD: 11 Dec 1998
- Country of Publication:
- United States
- Language:
- English
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