Superplastic behavior of coarse-grained aluminum alloys

Abstract

Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.

Advances in Transmission Electron Microscopy: Self Healing or is Prevention Better than Cure?

“…The initially inhomogeneous formation of subgrains gives rise to a "core and mantle" microstructure, in which most deformation is concentrated along the grain boundaries. In fine-grained superplasticity, this type of microstructure has been associated with grain mantle deformation processes as an accommodating mechanism for grain boundary sliding [73,74,77]. In the present case, dynamic recovery is initially confined to the mantle region, but extends throughout the microstructure at higher strains.…”

“…Note that the size distribution is fairly broad, with observed subgrain sizes ranging from 1 to 10 µm. [72][73][74][75] The effect of the Mg content on the tensile ductility is twofold. On the one hand, a higher Mg content increases the extent of solute drag, thereby stabilizing the plastic flow.…”

High-temperature tensile behavior and microstructural evolution of cold-rolled Al–6Mg–0.4Sc–0.13Zr alloy

“…7(b) is somewhat like those of an ECAEed Al alloy [6], gradually attaining a peak followed by a longer steady region 1. Moreover, there were serrations within it, indicating the occurrence of dynamic recrystallization in gauge section [16][17][18]. Besides, the true stress-strain curve at 773 and 803 K could even gradually increase with strain.…”

Neural network modelling of flow stress in Ti–6Al–4V alloy with equiaxed and Widmanstätten microstructures

“…The steady state behaviour in the ab phase material can be representative of superplastic deformation while in a single b phase material is indicative of dynamic recrystallisation or large grained super plasticity. 27,28 Predicted stress-strain behaviour beyond experimental data To examine the model capabilities to predict beyond the experimental data range, model was trained with total a equiaxed microstructure, 850uC; b equiaxed microstructure, 1050uC; c Widmanstä tten microstructure, 850uC; d Widmanstä tten microstructure, 1050uC 2 Predicted and experimental true stress-strain curves for different strain rates at 850uC (representing azb phase region) and 1050uC (representing b phase region) of equiaxed and Widmanstä tten microstructure data available for two microstructures. Then, the model was asked to predict the behaviour of flow curves beyond the trained data.…”