Fabrication of Al/Mg/Al laminate by a porthole die co-extrusion process
Liang Chen, Jianwei Tang, Guoqun Zhao, Cunsheng Zhang, Xingrong Chu
Index: 10.1016/j.jmatprotec.2018.03.027
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Abstract
A porthole die co-extrusion (PCE) process was proposed to fabricate the Al/Mg/Al laminate. The results showed that the laminate was successfully extruded without voids and cracks on the Al/Mg interface. The transition layer was formed and its thickness was increased with the increase of temperature. Partial dynamic recrystallization (DRX) occurred in Al layer, and the texture of Al layer has strong E {111}<011 > and Y {111}<112 > shear-typed components and relative weak Copper {112}<111 > and S {123}<634 > rolling components. The near complete DRXed grain structure was observed in Mg layer, and the average grain size increases with increasing temperature. Mg layer has strong basal plane texture with (0001) planes parallel to extrusion direction and prismatic planes with random distribution. At lower extrusion temperature, both the Al and Mg matrixes exhibited higher hardness. Furthermore, the hardness of Al/Mg interface is lower than that of the Al and Mg matrix.