On the relation between the Luders deformation and grain boundary structure in aluminium alloy

Yu. B. Timoshenko

Strain hardening of the fine grained AlMg6 alloy at room temperature was studied after the alloy annealing and preliminary superplastic deformation (SPD) at different strain rates. Electron microscopy, measurements of conventional yield stress, and strain hardening analysis indicated that SPD in regions II and III, corresponding to optimal and higher strain rates respectively, transformed the alloy into a state which prevented lattice dislocations from running into grain boundaries. At the same time, the equilibrium state of grain boundaries observed after annealing in state I (low strain rates), facilitates the generation and running of dislocations into grain boundaries and provides for the Luders deformation.

Mots clés: aluminium alloys; annealing; dislocation interactions; electron microscope examination of materials; grain boundaries; Luders bands; magnesium alloys; superplasticity; work hardening; yield stress; strain hardening; electron microscopy; Luders deformation; grain boundary structure; fine grained AlMg6 alloy; room temperature; alloy annealing; superplastic deformation; conventional yield stress; region II; lattice dislocations; equilibrium state; state I; 20 degC; AlMg

Domaines: Articles anciens

Yu. B. Timoshenko. On the relation between the Luders deformation and grain boundary structure in aluminium alloy. Revue de Physique Appliquée, 1990, 25 (10), pp.1001-1004. ⟨10.1051/rphysap:0199000250100100100⟩. ⟨jpa-00246265⟩