Initiation and Suppression of Crack Propagation during Magnesium Alloy Rolling
| Autor: | Jing Tian, Quan-xin Shi, Li-Xin Meng, Wei Liang, Jiafei Deng, Jin-yao Ma |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Technology
Materials science lattice distortion shear Article mental disorders General Materials Science Texture (crystalline) Composite material Magnesium alloy Shearing (manufacturing) Microscopy QC120-168.85 dislocation QH201-278.5 Fracture mechanics Engineering (General). Civil engineering (General) TK1-9971 Shear (sheet metal) Descriptive and experimental mechanics twinning deformation Electrical engineering. Electronics. Nuclear engineering TA1-2040 Dislocation Deformation (engineering) Crystal twinning texture |
| Zdroj: | Materials Volume 14 Issue 18 Materials, Vol 14, Iss 5217, p 5217 (2021) |
| ISSN: | 1996-1944 |
| DOI: | 10.3390/ma14185217 |
| Popis: | The conventional rolling of magnesium alloy with a single pass and large reduction will cause severe edge cracking. The sheet without cracks can be achieved by limited width rolling. The microstructure evolution of the sheet with cracks after conventional rolling and the sheet without cracks after limited width rolling is explored, and an effective mechanism for solving edge cracks is proposed. Conventional rolling can fully develop twin evolution due to high deformation, and three stages of twinning evolution can be observed and the secondary twins easily become the nucleation points of micro cracks, resulting in a large number of cracks propagating along the twin lamellae. Cracks terminate at dislocation accumulation because the accumulation of a large number of dislocations can hinder propagation. Dislocation shearing of twins to eliminate the high localization caused by twins and induce the tensile twins to weaken the basal surface texture provides an effective plastic deformation mechanism of crack inhibition, which is useful for expanding the engineering application of magnesium alloy rolled sheets. |
| Databáze: | OpenAIRE |
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