Abstract
Models for deformation and strain localization in polycrystals that incorporate microstructural features including particles are computationally intensive due to the large variation in scale in going from particles to grains to a specimen. As a result such models are generally 2-D in nature. This is an issue for experimental validation. We have therefore studied deformation heterogeneities and strain localization behavior of coarse-grained alloys with only two grains across the sample thickness, therefore mimicking 2-D behavior. Aluminum alloy sheets (AA5754) have been investigated by a number of surface techniques, including digital image correlation, slip trace analysis and electron backscattered diffraction, at the individual grain level. Local strain concentration zones appear from the very beginning of deformation, which then maintain sustained growth and lead, in one of these regions, to localization and final fracture. These 'hot spots' occur in areas with locally soft grains (i.e. grains with 〈0. 0. 1〉 or 〈1. 0. 1〉 close to the tensile direction) and soft-evolution orientations (i.e. grains with 〈1. 0. 1〉 close to the tensile direction). These grains can be correlated with Taylor and/or Schmid factors.
Original language | English |
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Pages (from-to) | 4187-4198 |
Number of pages | 12 |
Journal | Materials Science and Engineering: A |
Volume | 528 |
Issue number | 12 |
DOIs | |
State | Published - May 15 2011 |
Externally published | Yes |
Funding
We are very grateful to Mr. Robert Kubic, General Motors R&D Center, for helping with the EBSD work. The financial support from General Motors of Canada and the Natural Sciences and Engineering Research Council (NSERC) of Canada is acknowledged.
Funders | Funder number |
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General Motors of Canada | |
Natural Sciences and Engineering Research Council of Canada |
Keywords
- AA5754
- Coarse-grained
- Digital image correlation
- Strain concentration