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Constituent particle break-up during hot rolling of AA 5182
Abstract : Aluminum sheet is currently used for body panels on a number of mass-produced vehicles, in particular for closure panels. AA5xxx alloys always contain coarse inter-metallic particles (Al x(Fe,Mn) ySi, Mg 2Si) after casting. In the present work inter-metallic particle break-up during hot reversible rolling of AA5182 alloy sheets has been analyzed. The sizes and shapes of inter-metallic particles in as-cast and industrially hot rolled AA5182 alloys sheets were characterized by 3D X-ray tomography observations. The relation between particle break-up and particle morphology was then analyzed statistically and by a micromechanical finite element (FE)-based model. The essential outcomes of the statistical approach may be summarized as follows. The inter-metallic particle population may be described by five morphological parameters. Secondly the comparison of the particle morphology in as cast and industrially rolled sheets leads to the definition of five classes. The evolution of each particle class as function of the rolling strain is provided. The statistical analysis shows which particles break-up. The stresses and strains in inter-metallic particles, embedded in an elasto-viscoplastic aluminum matrix submitted to plane strain compression, were analyzed by an FE model. A new failure criterion was proposed. The essential outcomes of the mechanical approach are as follows: a precise description of stress concentration mechanisms in nonconvex particles, a close description of the parameters controlling particle break-up, and finally a simplified classification of the failure behavior.
Keywords :
Alloy sheets
Aluminum matrix
As-cast
Body panels
Break-up
Closure panels
Elasto-viscoplastic
Failure behaviors
Failure criteria
FE model
Finite elements
Hot-rolled
Inter-metallic particle
Micro-mechanical
Morphological parameters
Nonconvex
Particle morphologies
Particles break-up
Plane strain compression
Rolled sheets
Statistical analysis
Statistical approach
X-ray tomography
Cited literature [14 references]
https://hal.archives-ouvertes.fr/hal-00681824
Contributor : Estelle Parra-Denis Connect in order to contact the contributor
Submitted on : Thursday, March 22, 2012 - 3:30:04 PM
Last modification on : Monday, May 2, 2022 - 4:34:06 PM
Long-term archiving on: : Saturday, June 23, 2012 - 2:35:25 AM
Contributor : Estelle Parra-Denis Connect in order to contact the contributor
Submitted on : Thursday, March 22, 2012 - 3:30:04 PM
Last modification on : Monday, May 2, 2022 - 4:34:06 PM
Long-term archiving on: : Saturday, June 23, 2012 - 2:35:25 AM
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