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Microstructural evolution and mechanical properties of severely deformed Al-12Si casting alloy by equal-channel angular extrusion

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Abstract

Microstructural evolution and mechanical properties of Al-12Si alloy subjected to equal-channel angular extrusion (ECAE) were investigated. The high stresses imposed in ECAE led to the fragmentation of the needle-shaped eutectic silicon plates into smaller particles. The length and width of the Si particles decreased from 35.5±31.8 μm and 13.7±8.9 μm without ECAE to 2.7±1.1 μm and 1.3±0.4 μm after six ECAE passes, respectively. The average aspect ratio of 3.2±1.8 for the Si particles in the as-cast condition decreased to 1.18±0.8 after six ECAE passes with a corresponding increase in the average roundness of 0.26±0.19 to 0.61±0.19. ECAE increased the strength, ductility, and impact toughness of the alloy. The increase in the tensile and yield strengths after six passes was about 68 % and 100 %, respectively. The alloy after six ECAE passes exhibited 12 % elongation to failure, which was almost eight times higher than that of the as-cast alloy. The absorbed energy increased with an increase in the number of passes, finally reaching 11. 5 J/cm2 after six passes, which is about four times higher than that of the as-cast alloy.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Karadeniz Technical University, 61080, Trabzon, Turkey

    Gencaga Purcek, Onur Saray & Oktay Kul

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  1. Gencaga Purcek
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  2. Onur Saray
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  3. Oktay Kul
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Correspondence to Gencaga Purcek.

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Purcek, G., Saray, O. & Kul, O. Microstructural evolution and mechanical properties of severely deformed Al-12Si casting alloy by equal-channel angular extrusion. Met. Mater. Int. 16, 145–154 (2010). https://doi.org/10.1007/s12540-010-0145-1

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  • DOI: https://doi.org/10.1007/s12540-010-0145-1

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