Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1574153 | Materials Science and Engineering: A | 2015 | 9 Pages |
Abstract
Repetitive upsetting (RU), a newly developed SPD technique, was employed to process AZ91D magnesium alloy plates at 400 °C for 0, 2, 4 and 8 passes. The microstructure and texture evolution of the plates after RU were investigated and correlated with the mechanical performances at room temperature. Results show that the initial coarse grains are effectively refined, however an abnormal grain coarsening appears after 8 passes of RU. A compression texture and a shear texture, induced by specific local strains, are observed within the RU-processed plates. Both the ultimate tensile strength (UTS) and elongation to fracture of the RU-processed AZ91D alloy are improved with the increase of RU passes, exhibiting a maximum increase of 35.8% and over 75%, respectively. The yield strength (YS) increases steadily in the first 4 RU passes and then decreases slightly after another 4 passes. The mechanical anisotropy is discussed from the perspective of texture and Schmid factor.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Li Zhang, Bing Ye, Wenjun Liao, Hao Zhou, Wei Guo, Qudong Wang, Haiyan Jiang, Wenjiang Ding,