Abstract
A high-Mg2Si content Al alloy was extruded by equal channel angular pressing (ECAP) for 8 passes at 250 °C and an ultrafine-grained structure with an average grain size of about 1.5 μm was achieved. The coarse skeleton-shaped Mg2Si phase presenting in the as-cast alloy are significantly fragmented into fine rod-shaped as well as equiaxed particles mostly less than about 230 nm and become relatively dispersed. The tensile strength 192.8 MPa and the elongation up to 31.3% at ambient temperature are attained in the 8-pass ECAPed alloy versus 163.3 MPa and 9.1% in the as-cast alloy. High-temperature creep test at 250 °C reveals that the ECAPed sample exhibits a high elongation close to 100% at a relatively high creep rate 7.64×10−5 s−1, compared to the elongation 56% at a low strain rate 1.74×10−7 s−1 in the as-cast alloy.
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Funded by the Specialized Fund for the Innovation of College Student of Taiyuan City (No. 08122067, 07010727), the Natural Science Foundation of Shanxi Province, China (No. 2006011051), and Shanxi Research Fund for Returned Scholars(No.2007-25)
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Bian, L., Liang, W., Ma, J. et al. Effect of ECAP on the microstructure and mechanical properties of a high-Mg2Si content Al-Mg-Si alloy. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 25, 395–398 (2010). https://doi.org/10.1007/s11595-010-0009-z
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DOI: https://doi.org/10.1007/s11595-010-0009-z