Home Kovove Materialy-Metallic Materials 2019 Kovove Materialy-Metallic Materials Vol. 57 (2019), no. 4, pp.229–236

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Kovove Materialy-Metallic Materials Vol. 57 (2019), no. 4, pp.229–236

Title: Study of mechanical, microstructural and thermal stability properties of friction stir processed aluminum 2024-T3 alloy
Author: M. Regev, S. Spigarelli

Abstract: Friction Stir Processing (FSP) was applied on AA2024-T3 plates. The hardness and tensile
properties of the stir zone were tested, and a microstructure study was conducted. During the
FSP the coarse elongated grains of the parent material changed into fine equiaxed ones, refinement
of the coarse precipitates detected at the parent material occurred at the same time.
The material subjected to FSP was found to be thermally unstable, as revealed by aging
experiments at 300◦C and precipitate chemical analysis. TEM study showed that the rolled
parent material contained low-angle sub-grains with dislocation network boundaries. During
FSP these were replaced by fine equiaxed grains with clear boundaries and no dislocation tangles.
This led to the conclusion that the material underwent Dynamic Recovery (DRV) during
the rolling process, as opposed to Dynamic Recrystallization (DRX) during FSP. Thus, FSP
appears to have the technological potential for improving the microstructure and mechanical
properties of AA2024.

Keywords: Friction Stir Processing (FSP), AA2024-T3, dislocations, dynamic recovery, dynamic recrystallization
Published online: 25-Jun-2019
Year: 2019, Volume: 57, Issue: 4 Page From: 229, Page To: 236

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