Backward extrusion technology has been performed to improve the mechanical properties of Mg-Gd based alloy. Microstructure, mechanical properties and strengthening mechanism of backward extruded Mg-Gd based alloy were investigated. The average grain size of backward extruded alloy was about 5μm. The coarse eutectic compounds formed during the solidification were dispersed into polygon-shaped precipitates and were distributed along the extruded direction. The alloy exhibited obviously age hardening response at 225°C. Both backward extruded state and aged state samples show high thermal stability in the range from room temperature to 200°C. The ductility of backward extruded alloy at low temperatures was improved greatly compared with the as-cast state sample. The enhanced mechanical properties and thermal stability were mainly attributed to the grain refinement, the dispersed precipitates and fine meta-stable precipitates. It was established that backward extrusion technology was an effective method to manufacture high performance Mg-RE based alloys containing high RE content. © 2011 Elsevier B.V.
Peng, Q., Dong, H., Tian, Y., & Zhang, H. (2012). Effect of backward extrusion on microstructure and mechanical properties of Mg-Gd based alloy. Materials Science and Engineering A, 532, 443–448. https://doi.org/10.1016/j.msea.2011.11.010