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

Release time:2021-10-21

DOI number:10.1016/j.jallcom.2018.03.359

Journal:Journal of Alloys and Compounds

Key Words:Magnesium alloy; Long-period stacking ordered; Kink; Recrystallization; Workability; Ductility

Abstract: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 α-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 °C and their elongation is all increased by ∼20%. The sample compressed at 420 °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.

Co-author:C.M. Liu*, Y.H. Gao, S.N. Jiang, Z.Y. Chen

First Author:X.J. Zhou

Document Type:J

Volume:749

Page Number:878-886

ISSN No.:0925-8388

Translation or Not:no

Date of Publication:2018-03-28