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- Title
Structure and Mechanical Properties of AlMg4.5 And AlMg4.5Mn Wires Extruded by Kobo Method.
- Authors
Jaskowski, M.; Pieła, K.; Błaz, L.
- Abstract
The influence of the number of extrusion steps in KoBo method (at the same total extrusion ratio of λ = 100) on structure, mechanical properties and work hardening characteristics of AlMg4.5 and AlMg4.5Mn (AA5083) alloys was investigated. It was found that one-step extrusion leads to the formation of recrystallised structure of the material, while the use of two-step extrusion yields a fibrous structure of a 'mixed' type, i.e. containing areas where the intensive recovery effects are associated with partially recrystallised structure. As a consequence, the strength properties of the latter extrudate are much higher in both as extruded state and after the subsequent cold rolling. In all cases, the tensile stress-strain curves of the extrudates show the flow stress serrations that are typical for the Portevin - LeChatelier (P-L) effect. In a few tensile tests, the P-L effect was preceded by the plastic flow instability being typical for the occurrence of Lüders bands. Both AlMg4.5 and AlMg4.5Mn extruded wires show a monotonic increase of the work hardening that results from the following cold deformation in the groove rolling.
- Subjects
ALUMINUM alloys; METAL extrusion; STRAIN hardening; RECRYSTALLIZATION (Metallurgy); COLD rolling
- Publication
Archives of Metallurgy & Materials, 2014, Vol 59, Issue 2, p473
- ISSN
1733-3490
- Publication type
Article
- DOI
10.2478/amm-2014-0078