Biaxial deformation in high purity aluminum
Materials Science and Engineering: A, ISSN: 0921-5093, Vol: 648, Page: 330-339
2015
- 6Citations
- 17Captures
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Article Description
The convergence of multiple characterization tools has been applied to investigate the relationship of microstructure on damage evolution in high purity aluminum. The extremely coarse grain size of the disc-shaped sample provided a quasi-two dimensional structure from which the location of surface-measured features could be inferred. In particular, the role of pre-existing defects on damage growth was accessible due to the presence of casting porosity in the aluminum. Micro tomography, electron backscatter diffraction, and digital image correlation were applied to interrogate the sample in three dimensions. A recently developed micro-bulge testing apparatus was used to deform the pre-characterized disc of aluminum in biaxial tension, and related analysis techniques were applied to map local strain fields. Subsequent post-mortem characterization of the failed sample was performed to correlate structure to damaged regions. It was determined that strain localization and associated damage was most strongly correlated with grain boundary intersections and plastic anisotropy gradients between grains. Pre-existing voids played less of an apparent role than was perhaps initially expected. These combined techniques provide insight to the mechanism of damage initiation, propagation, and failure, along with a test bed for predictive damage models incorporating anisotropic microstructural effects.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0921509315304251; http://dx.doi.org/10.1016/j.msea.2015.09.086; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84942586734&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S0921509315304251; https://dx.doi.org/10.1016/j.msea.2015.09.086
Elsevier BV
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