Improved workability and ductility of the Mg-Gd-Y-Zn-Zr alloy via enhanced kinking and dynamic recrystallization

In order to improve the workability and ductility of the Mg-Gd-Y-Zn-Zr alloy filled with intragranular long-period stacking ordered (LPSO) phases, the processing route of extrusion prior to compression was designed in this work. As extrusion induces the regular arrangement of the basal plane of LPSO phases and deformed alpha-Mg grains along the extrusion direction (ED), subsequent compression parallel to ED brings about numerous kink bands which can promote the dynamic recrystallization (DRX) via the continuous DRX mechanism. The enhanced DRX ratio and the restrained dynamic precipitation lead to the improved workability and ductility. No macrocracks can be detected in all the samples compressed at 420-480 degrees C and their elongation is all increased by similar to 20%. The sample compressed at 420 degrees C exhibits the superior comprehensive mechanical properties, with the tensile yield strength, ultimate tensile strength, and elongation being 305 MPa, 339 MPa, and 9.5%, respectively. (C) 2018 Elsevier B.V. All rights reserved.