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Roll-formability of cryo-rolled ultrafine aluminium sheet
journal contribution
posted on 2014-01-01, 00:00 authored by Jascha Marnette, Matthias WeissMatthias Weiss, Peter HodgsonPeter HodgsonUltrafine-grain aluminium sheet was produced by rolling at cryogenic (CR) and at room temperature (RTR). Commercial purity aluminium plate was reduced in 30 passes from an initial material thickness of 10 mm to a final thickness of 2 mm (80% reduction). Tensile stress and strength were significantly increased while total elongation was drastically reduced. It was found that despite the low tensile elongation both materials are able to accommodate high localised strains in the neck leading to a high reduction in area. The formability of the material was further investigated in bending operations. A minimum bending radius of 6 mm (CR) and 5 mm (RTR) was found and pure bending tests showed homogeneous forming behaviour for both materials. In V-die bending the cryo-rolled material showed strain localisations across the final radius and kinking of the sample. It has been found that even if the total elongation in tension is close to zero leading to early failure in V-die bending, ultra-fine grained and low ductile sheet metals can be roll formed to simple section shapes with small radii using commercial roll forming equipment.
History
Journal
Materials and designVolume
63Issue
1Pagination
471 - 478Publisher
ElsevierLocation
London, EnglandPublisher DOI
ISSN
0261-3069eISSN
1873-4197Language
engPublication classification
C Journal article; C1 Refereed article in a scholarly journalCopyright notice
2014, ElsevierUsage metrics
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