| Autor: |
Yun Lai Deng, Ying Zheng, Chang Ping Tang |
| Rok vydání: |
2014 |
| Předmět: |
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| Zdroj: |
Advanced Materials Research. 900:719-724 |
| ISSN: |
1662-8985 |
| DOI: |
10.4028/www.scientific.net/amr.900.719 |
| Popis: |
Superplasticity at high deformation rates is desirable in order to make superplastic forming more practical. High strain rate superplastic behavior and microstructure of the rolled Mg-Gd-Y-Zr alloy sheet were investigated. For the purposes, tensile tests at the strain rate of 0.01 s-1were conducted, which revealed that the sheet exhibited elongations of 180%~266%. Post-deforming microstructures were characterized by optical microscopy, scanning electron microscopy and transmission electron microscopy, while crystallographic orientation information was obtained from macro-texture analysis. The results show that the high strain rate superplasticity was attributed to class-I creep accommodated by dynamic recrystallization. It is suggested from microstructural analysis results that the interaction between second phases and dislocation facilitated dynamic recrystallization. The macro-texture at the strain of 0.8 still exhibited some characteristics of the crystal rotation arising from dislocation slip despite the occurrence of DRX. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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