The effect of dispersoids on the grain refinement mechanisms during deformation of aluminium alloys to ultra-high strains |
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| Affiliation: | 1. National University of Sciences and Technology “MISIS”, Leninskiy Ave. 4, 119049 Moscow, Russia;2. Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia;1. Key Laboratory for Anisotropy and Texture of Materials, Northeastern University, Shenyang 110004, PR China;2. College of Materials and Metallurgy, Northeastern University, Shenyang 110004, PR China;3. Department of Metallurgical and Materials Engineering, Department of Metallurgical and Materials Engineering, 500 W. University Avenue, University of Texas at El Paso, TX 79968, USA;1. WPI, International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka 819-0395, Japan;2. Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan |
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| Abstract: | The effect of fine dispersoids on the mechanisms and rate of grain refinement has been investigated during the severe deformation of a model aluminium alloy. A binary Al–0.2Sc alloy, containing coherent Al3Sc dispersoids, of ∼20 nm in diameter and ∼100 nm spacing, has been deformed by equal channel angular extrusion to an effective strain of ten. The resulting deformation structures were quantitatively analysed using high-resolution electron backscattered diffraction orientation mapping, and the results have been compared to those obtained from a single-phase Al–0.13Mg alloy, deformed under identical conditions. The presence of fine, non-shearable, dispersoids has been found to homogenise slip, retard the formation of a cellular substructure and inhibit the formation of microshear bands during deformation. These factors combine to reduce the rate of high-angle grain boundary generation at low to medium strains and, hence, retard the formation of a submicron grain structure to higher strains during severe deformation. |
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