Effect of Temperature Field and Stress Field of Different Crack Behavior on Twins and Dislocations under Mg Alloy Rolling
| Autor: | Quan-xin Shi, Wanggang Zhang, Yuanying Chang, Wei Liang, Jiafei Deng, Jing Tian |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Technology
Materials science twinning Slip (materials science) Plasticity Article temperature field General Materials Science Compression (geology) Magnesium alloy Composite material Microscopy QC120-168.85 dislocation stress field QH201-278.5 Engineering (General). Civil engineering (General) Microstructure TK1-9971 Stress field Descriptive and experimental mechanics Electrical engineering. Electronics. Nuclear engineering TA1-2040 rolling Dislocation Crystal twinning |
| Zdroj: | Materials Volume 14 Issue 19 Materials, Vol 14, Iss 5668, p 5668 (2021) |
| ISSN: | 1996-1944 |
| DOI: | 10.3390/ma14195668 |
| Popis: | Aiming at the problem of the poor plasticity of magnesium alloy leading to serious edge cracks in the rolling process, this paper conducts a systematic study on the crack suppression mechanism of rolling under different thickness reductions. Using restricted rolling and conventional rolling, comparing the microstructure evolution of the plate after rolling, and combining the information of the simulated temperature field and stress field of the plates, the behavior of twins and dislocations under different thickness reductions is explained, and the influence of serious damage caused by single-pass hot rolling of magnesium alloy is explored. The compressive stress fields along with the transverse and normal directions under restricted rolling cause the compression twins to mature into secondary twins under rolling with small thickness reduction and induce a large number of tensile twins when the thickness reduction amount is increased. The multiple slips activated by the higher temperature field at the edge of the small thickness reduction amount cause dislocations to be distributed inside and outside the twins, while the edge with large thickness reduction can activate more slip due to the high-temperature field resulting from friction, resulting in the twin be destroyed. |
| Databáze: | OpenAIRE |
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