摘要
One of the severe plastic deformation techniques, elliptical cross-sectioned spiral equal-channel extrusion (ECSEE) was successfully applied to the pure Mg processed at 200°C and the microstructure and properties were studied. The observation shows that the grains are refined to 2.1 µm after 2-pass deformation. The proportion of high-angle grain boundary increases to 49.4% after 6-pass. The minimum time of grain boundary rotating 30° is about 0.847 ms, and the maximum time is 2.34 ms. TEM observation illustrates the grain morphology evolves from shear bands to recrystallised grains. There was a significant increase in strength to ∼180 MPa but a decrease in the ductility (∼12%) of pure Mg after 6-pass ECSEE. The refinement mechanism is mainly divided into mechanical and physical refinement.
源语言 | 英语 |
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页(从-至) | 384-394 |
页数 | 11 |
期刊 | Materials Science and Technology |
卷 | 37 |
期 | 4 |
DOI | |
出版状态 | 已出版 - 2021 |