Abstract
Magnesium alloy sheet is prone to edge cracking during rolling. We carry out a microstructural analysis for edge cracks in Mg sheet under multiple rolling passes and different temperatures, where the microstructure, hardness and crystal orientation are explored and compared at the edge and middle of the specimen. The results indicate that the cracks are likely initiated from the edge due to coarsened grains, less basal texture and severe damage. A grain band with very fine grains is developed along the crack propagation path owing to the recrystallisation that takes place at the plastic zone in front of the crack tip. A rolling map is also obtained, which may help to guide the edge crack free rolling of Mg sheet. © 2012 Institute of Materials, Minerals and Mining.
| Original language | English |
|---|---|
| Pages (from-to) | 415-419 |
| Number of pages | 5 |
| Journal | Materials Science and Technology |
| Volume | 28 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2012 |
| Externally published | Yes |
Funding
The present work was supported by the National Natural Science Foundation of China (grant no.50928601), the Changjiang Scholar Program from the Ministry of Education of China, the World Class University (WCU) programme through the National Research Foundation of Korea (grant no. R32-2008-000-20042-0), the National Science Foundation (grant no. CMMI-0643726), DARPA (W91CRB-11-C-0112), the 973 National Grand Theoretical Research Program (grant no. 2007CB613700), the National Natural Science Foundation of China (grant no. 50725413), the International Cooperation Program (grant nos. 2010 DFR50010 and 2008DFR50040) and the Chongqing Sci & Tech Program (grant nos.CSTC2010AA4048 and 2010CSTC-HDLS).
Keywords
- Edge crack
- Magnesium alloy
- Microstructure
- Rolling