Deformation-Induced Grain Refinement in AlMg5 Alloy

Abstract:

The results presented in this paper are concerned with the microstructure and the mechanical properties of the AlMg5 alloy subjected to severe plastic deformation by multiple compression in two orthogonal directions. Four experiments with an increasing number of passes were conducted on the Gleeble MAXStrain system in order to obtain various effective strain levels. The deformed microstructure was investigated by means of the light microscopy (LM) and the scanning transmission electron microscopy (STEM). The mechanical properties were determined for the most deformed, central parts of samples. Investigations revealed that severe cold deformation of the AlMg5 alloy leads to strong grain refinement. Moreover, fragmentation of large intermetallic inclusions and their regular distribution were obtained in the analysed, central parts of the samples. Microstructural changes led to significant improvement in the strength properties. After reaching the effective strain of 9, the AlMg5 alloy exhibited UTS, YS and HV values almost two times higher than corresponding values determined for the starting, annealed material.

• Periodical: Solid State Phenomena (Volume 191)
• Pages: 37-44
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.191.37
• Online since: August 2012
• Authors: Kinga Rodak, Jacek Pawlicki, Marek Tkocz
• Keywords: Aluminium Alloy, Fine-Grained Microstructure, MAXStrain, Mechanical Property, Minisamples, Severe Plastic Deformation (SPD), STEM, Strain Hardening

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