The second phase particles and mechanical properties of 2124 aluminum alloy processed by accumulative back extrusion |
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| Affiliation: | 1. Faculty of Mechanical Engineering, GIK Institute of Engineering Sciences & Technology, Pakistan;2. Faculty of Materials & Chemical Engineering, GIK Institute of Engineering Sciences & Technology, Pakistan;1. Key Laboratory of Aerospace Advanced Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, PR China;2. Department of Materials Science and Engineering, China University of Petroleum Beijing, Beijing 102249, PR China;1. Department of Materials Science and Engineering, Norwegian University of Science and Technology (NTNU), 7491, Trondheim, Norway;2. SINTEF Materials and Chemistry, 7465, Trondheim, Norway;1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;2. Department of Engineering, University of Leicester, Leicester LE1 7RH, UK |
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| Abstract: | An age-hardenable 2124 aluminum alloy was severely deformed by accumulative back extrusion (ABE) method up to three passes at 100 and 200 °C. The characteristics of the second phase particles were studied using scanning electron microscopy. The results indicated that the size of primary particles had been reduced after the first ABE pass where even much finer particles was obtained as the successive passes were applied. In addition, the secondary particles were fragmented into finer pieces after ABE at 100 °C, whereas a particle coarsening was realized as the deformation temperature rose to 200 °C. The latter was attributed to the Ostwald ripening mechanism. However, the volume fraction of secondary particles was significantly decreased after three ABE passes at 200 °C due to the occurrence of deformation induced dissolution. Additionally, the tensile properties of the processed materials were measured utilizing a miniaturized tensile testing method. The results were justified considering the evolution of the second phase particles. |
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| Keywords: | Aluminum alloy Severe plastic deformation Second phase particles Mechanical properties |
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