Structure Development and Deformation Behaviour of Pure Aluminium Processed by Constrained Groove Pressing

Abstract:

In this study, the relationship between the structure and properties of commercial purity aluminium alloy A1199 was investigated by applying constrained groove pressing (CGP) deformation method. The refinement of the coarse grain aluminium (Al) microstructure to sub microcrystalline size by large plastic strain at room temperature defined. The impact of various strains upon microstructure changes is investigated using transmission electron microscopy (TEM of thin foils) and electron back scatter diffraction (EBSD). A mixture of subgrains produced by grains subdivision and polygonized subgrains formed locally due to dynamic recovery was found in the deformed aluminium structure. The tensile properties and resulting hardness are related to microstructural evolution induced by constrained groove pressing deformation. A substantial impact of straining upon the increasing in tensile strength was observed after the first deformation step (first pass) Further strain increase had an insignificant effect on tensile strength but was accompanied by ductility loss. The post deformation annealing effect was then explored with aim to increase the ductility. The results indicate that changes in strength and ductility may be related to formation of a bimodal structure in deformed plates.

• Periodical: Materials Science Forum (Volumes 794-796)
• Pages: 882-887
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.794-796.882
• Online since: June 2014
• Authors: Jozef Zrník*, Miroslav Cieslar, Peter Slama
• Keywords: Aluminium Alloy, Deformation Respond, Ductility, Microstructure, Post-Deformation Annealing, Severe Plastic Deformation, Strength, Structure Conditioning

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