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论文类型：期刊论文

发表时间：2016-12-11

发表刊物：MATERIALS SCIENCE AND TECHNOLOGY

收录刊物：SCIE、EI、Scopus

卷号：32

期号：18

页面范围：1869-1876

ISSN号：0267-0836

关键字：Multi-pass; Dynamic recrystallisation; Grain refinement; Fracture mode; Large strain rolling

摘要：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.