Grain refinement during superplastic deformation of coarse-grained Al-Mg-Cu alloys

M. I. Cruz-Palacios, D. Hernández-Silva, L. A. Barrales-Mora, M. A. García-Bernal

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

In the present study the superplastic behavior of Al-6%Mg-0.5%Cu and Al-8%Mg-0.5%Cu in a coarse grain size condition has been studied. The alloys are melted in an electrical furnace under argon atmosphere. The ingots (25 mm thick) are homogenized at 400°C during 72 h and then rolled at 430°C to a thickness of 5 mm. The mean grain size after rolling is 55 μ for the 6%Mg alloy and 61 μm for the 8%Mg alloy. Tensile test specimens are machined from the rolled plate in the rolling direction. Strain-rate-change tests at temperatures between 300 and 450°C and strain rates between 1×10 -4 and 1×10 -1 s -1 are carried out to determine the strain rate sensitivity of the flow stress. Finally, elongation to failure tests are conducted at temperatures and strain rates where the alloys show a high strain rate sensitivity. Elongations higher than 390 % are obtained for the 8%Mg alloy. It is observed that the grip regions of the deformed samples show coarser grains than the regions near to the fracture surface. This means that grain refinement takes place during deformation, suggesting that the principal deformation mechanism is dislocation creep.
Original languageAmerican English
Title of host publicationGrain refinement during superplastic deformation of coarse-grained Al-Mg-Cu alloys
Pages75-80
Number of pages66
ISBN (Electronic)0878499938, 9780878499939
DOIs
StatePublished - 1 Dec 2006
Externally publishedYes
EventMaterials Science Forum -
Duration: 1 Dec 2006 → …

Publication series

NameMaterials Science Forum
Volume509
ISSN (Print)0255-5476

Conference

ConferenceMaterials Science Forum
Period1/12/06 → …

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