Authors: Liping Bian Wei Liang Jian Ma Shunqi Wang Kehua Chen Jinbo Xue Hongxia Wang Aiping Liang
Publish Date: 2010/06/12
Volume: 25, Issue: 3, Pages: 395-398
Abstract
A highMg2Si content Al alloy was extruded by equal channel angular pressing ECAP for 8 passes at 250 °C and an ultrafinegrained structure with an average grain size of about 15 μm was achieved The coarse skeletonshaped Mg2Si phase presenting in the ascast alloy are significantly fragmented into fine rodshaped as well as equiaxed particles mostly less than about 230 nm and become relatively dispersed The tensile strength 1928 MPa and the elongation up to 313 at ambient temperature are attained in the 8pass ECAPed alloy versus 1633 MPa and 91 in the ascast alloy Hightemperature creep test at 250 °C reveals that the ECAPed sample exhibits a high elongation close to 100 at a relatively high creep rate 764×10−5 s−1 compared to the elongation 56 at a low strain rate 174×10−7 s−1 in the ascast alloy
Keywords: