Extrusion textures in Al, 6061 alloy and 6061/SiCp nanocomposites |
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| Affiliation: | 1. Department of Materials, University of Oxford, Parks Road, OX1 3PH Oxford, UK;2. Advanced Materials Group, Facultad de Ingeniería, Universidad de Buenos Aires, Paseo Colón 850, Buenos Aires 1063, Argentina;3. Department of Mechanical Engineering and Mathematical Sciences, Oxford Brookes University, Wheatley Campus, OX33 1HX Oxford, UK;1. Oak Ridge National Laboratory, Oak Ridge, TN, United States;2. Northwestern University, Department of Materials Science and Engineering, Northwestern University Center for Atom Probe Tomography (NUCAPT), Evanston, IL 60208-3108, United States;3. Department of Mechanical Biomedical and Aerospace Engineering, University of Tennessee Knoxville, United States |
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| Abstract: | The 6061 alloy matrix composites reinforced with 10 wt.% and 15 wt.% of SiC nanoparticles with an average diameter of ~ 500 nm were hot extruded in strip shape from ball milled powders. The microstructures and textures of the hot extruded nanocomposites have been investigated by means of three dimensional orientation distribution functions and electron backscatter diffraction (EBSD) techniques. Pure Al and 6061 alloy extruded strips from atomised powders have been produced for comparison purposes. The results show that the non-deformable SiC particulates have a strong influence on the formation of extrusion textures in the matrix. Pure Al and 6061 alloy develop a typical β fibre texture after extrusion in strip shape. For 6061/SiCp nanocomposites, the intensities of major texture components decrease with increasing amount of SiC particles. The total intensities of Brass, Dillamore and S components have decreased by 19% for 6061/10 wt.% SiCp and 40% for 6061/15 wt.% SiCp composites when compared with the 6061 alloy. EBSD analysis on local grain orientations shows limited Al grain rotations in SiC rich zones and decreased texture intensities. |
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