Abstract
Commercial-purity (99 wt pct), bulk, ultrafine-grained aluminum samples were produced by a two-step process that combines powder consolidation by hot isostatic pressing and dynamic plastic deformation. The compaction step yielded crystallographic texture-free specimens with an average grain size of approximately 2 μm. Then, some of the consolidated specimens were deformed dynamically at room temperature at an initial strain rate of 370 seconds−1 and up to an axial strain of ε = 1.25. After dynamic plastic deformation, the grain size and the dislocation density were approximately 500 nm and 1014 m−2, respectively. The yield strength was approximately 77 MPa for the as-consolidated sample, which increased up to approximately 103 MPa and 120 MPa for the impacted samples along the axial and radial directions, respectively. The compression stress as a function of strain showed saturation behavior for the axially deformed samples, whereas the specimens deformed along the radial direction exhibited significant strain softening. The latter behavior is explained mainly by the weakening of the crystallographic texture that occurred because of the strain-path change along the radial direction.
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Acknowledgments
This work was supported in part by the French National Research Agency, ANR (ANR 09-BLAN-0010-01) as well as by Grant No. K-81360 from the Hungarian Scientific Research Fund, OTKA,. The European Union and the European Social Fund have provided financial support to the project under the grant agreement TÁMOP 4.2.1./B-09/1/KMR-2010-0003.
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Manuscript submitted January 21, 2011.
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Dirras, G., Chauveau, T., Abdul-Latif, A. et al. Ultrafine-Grained Aluminum Processed by a Combination of Hot Isostatic Pressing and Dynamic Plastic Deformation: Microstructure and Mechanical Properties. Metall Mater Trans A 43, 1312–1322 (2012). https://doi.org/10.1007/s11661-011-1028-x
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DOI: https://doi.org/10.1007/s11661-011-1028-x