Strengthening the Mg-Y-Zn alloy through the formation of nanoscale lamellar structures and nanograins

Release time:2021-10-21

DOI number:10.1016/j.jallcom.2021.161148

Journal:Journal of Alloys and Compounds

Key Words:Mg-Y-Zn alloy; Cold rotary swaging; Stacking faults; NanoscaleStrengthening effect

Abstract:Extruded Mg-3.16Y-1.87Zn (wt%) alloy bars containing coarse block-shaped phases and fine needle-shaped phases were prepared via cold rotary swaging in this study. The microstructure evolution during deformation was investigated using scanning and transmission electron microscopy. The results show that little change was observed in the block-shaped phases in the swaged samples, while significant curving and kinking was observed in the needle-shaped phases. After swaging, nanoscale lamellar structures containing basal stacking faults and adjacent alpha-Mg nanoslices were formed in the area with needle-shaped phases, showing randomly distributed orientation between adjacent alpha-Mg nanoslices. Nanograins were formed in the area without any phases. The formation of nanoscale lamellar structures and nanograins contributed to the remarkable strengthening of the swaged alloy bars. Moreover, the extruded samples with a smaller spacing of the stacking faults and a higher fraction of the needle-shaped area show a higher strengthening effect after swaging. (c) 2021 Elsevier B.V. All rights reserved.

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

First Author:X. Chen

Indexed by:Journal paper

Document Type:J

Volume:886

Page Number:161148

ISSN No.:0925-8388

Translation or Not:no

Date of Publication:2021-07-16