Release Time:2019-03-13  Hits:

Indexed by: Journal Article

Date of Publication: 2016-12-11

Journal: MATERIALS SCIENCE AND TECHNOLOGY

Included Journals: Scopus、EI、SCIE

Volume: 32

Issue: 18

Page Number: 1869-1876

ISSN: 0267-0836

Key Words: Multi-pass; Dynamic recrystallisation; Grain refinement; Fracture mode; Large strain rolling

Abstract: As-cast AZ31 magnesium alloy subjected to multi-pass large strain rolling was investigated. A successive rolling process up to three passes was carried out at 370 degrees C with a pass reduction of 30%. Deformation microstructure characteristics prove that the dynamic recrystallisation (DRX) mode changed with the increase of rolling passes. In the first pass, DRX related to twinning played a dominant role. But in the third pass, DRX grains mainly appeared around the pre-existing grain boundaries. The ultimate strength and elongation of rolled sheets after three passes rolling are enhanced by 37 and 39%, respectively, compared to the as-cast alloy. Meanwhile, the tensile fracture mode was ductile fracture which was different from the ductile-brittle fracture of as-cast.