Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5455816 | Materials Science and Engineering: A | 2017 | 12 Pages |
Abstract
The deformation structures, mechanical properties and strengthening mechanisms of a 2519 aluminum alloy subjected to cold rolling up to a total reduction of 80% (ε ~ 1.61) in the supersaturated solid solution condition were studied. The formation of cell structure and a one hundred-fold increase in lattice dislocation density up to â¼ 2.1 à 1015 mâ2 after a 40% reduction leads to increase in yield stress (ÏYS) and ultimate tensile strength (ÏUTS) from 135 to 453 MPa, from 350 to 503 MPa, respectively. The formation of fully lamellar structure and further increase in lattice dislocation up to Ïd ~ 5 à 1015 mâ2 take place at an 80% reduction. As a result, ÏYS and ÏUTS increase to 560 and 590 MPa, respectively. Yield stress at reductions ⥠40% are significantly higher than that in an AA2519T87 alloy. Subdivision of initial grains by lamellar boundaries due to deformation banding provide high efficiency of dislocation strengthening due to the accumulation of an extremely high density of lattice dislocations in supersaturated solid solution and retention of sufficient elongation-to-failure of 9% and 5% after reductions of 40% and 80%, respectively.
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Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
I. Zuiko, R. Kaibyshev,