|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Pan American Materials Congress: Nanocrystalline and Ultra-fine Grain Materials and Bulk Metallic Glasses
||Strengthening Contributions on a Commercially Al-Mg-Si Alloy Processed by ECAP
||Tarek Khelfa, Mohamed Ali Rekik, Jairo-Alberto Mu˝oz-Bola˝os, Mohamed Khitouni, Jose-Maria Cabrera
|On-Site Speaker (Planned)
The evolution of the microstructure and the mechanical response of an AA6060 alloy subjected to severe plastic deformation by ECAP has been studied. Samples were deformed in a 90║ die from 1 to 12 passes at room temperature following route Bc. The microstructure was evaluated by means of EBSD. Since During the first ECAP pass, the microstructure developed a large fraction of low angle boundaries associated with subgrain formation. A heterogeneous ultra-fine grain structure with an average grain size of 0.57 Ám and 0.47 Ám was obtained after 8 and 12 passes, respectively. Significant increases in hardness and tensile strength were observed since the first pass. The dependence of the yield stress on deformation and Mg content was evaluated in terms of the Hall–Petch effect, dislocation density, solid solution and precipitation strengthening.
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