Upper bound analysis of deformation and dynamic ageing behavior in elevated temperature equal channel angular pressing of Al-Mg-Si alloys

Abstract

In the present study, the plastic deformation and dynamic strain ageing behavior of Al-6082 (Al-Mg-Si) alloy treated with elevated temperature equal channel angular pressing (ECAP) were investigated using upper bound analyses. Tensile tests were carried out over wide ranges of temperature and strain rate in order to evaluate the dynamic ageing conditions. ECAP processing was then experimentally performed at temperatures from room temperature up to 200°C under various strain rates ranging between 10 −4 s −1 and 10 −1 s −1. The upper bound analysis solutions and the experimental results are comparable. A theoretical dynamic ageing region was found to be in the temperature range of 90°C to 260°C, which is in agreement with the experimental observations in the temperature range of 75°C to 175°C.

Dynamic strain aging of a commercial Al–Mg–Si–Cu alloy during equal channel angular extrusion process

“…Moreover, from two main competitive phenomena, dynamic recovery and DSA, dynamic recovery is relatively suppressed by the solute and/or precipitate content in matrix and the aging responses in the alloy is accelerated by using ECAE contributing to a higher strengthening effect. Furthermore, the hydrostatic pressure developed during ECAE enhances the density of mobile dislocations [18]. In addition, in the case of ECAE there is a noteworthy plastic deformation arising from the shape of deformation zone that produces a high dislocation density.…”

Experimental and numerical investigation of residual stress distribution in Al-6061 tubes under using tubular channel angular pressing process by new trapezoidal channel

“…In these techniques, the sample undergoes severe strains, which results in the production of UFG material. Among these, there are several SPD methods by researchers, which can be done by methods such as equal channel angular pressing (ECAP), [10][11][12] constrained groove pressing (CGP), 13,14 accumulative spin-bonding (ASB), 15 equal channel angular rolling (ECAR). 16 Much research has been done for specifying the residual stresses in SPD processes.…”