Achieving high strain rate superplasticity of an Al-Mg-Sc-Zr alloy by a new asymmetrical rolling technology
Autor: | Tao Zhang, Zhimin Yin, Guofu Xu, Xiaowu Cao, Yulu Duan, Ying Deng, Xiaoyan Peng |
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Rok vydání: | 2016 |
Předmět: |
010302 applied physics
Materials science Mechanical Engineering Metallurgy Superplasticity 02 engineering and technology Strain rate 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Deformation mechanism Mechanics of Materials 0103 physical sciences General Materials Science Grain boundary Deformation (engineering) 0210 nano-technology Ductility Grain Boundary Sliding |
Zdroj: | Materials Science and Engineering: A. 672:98-107 |
ISSN: | 0921-5093 |
Popis: | Superplastic property and microstructure evolution during the deformation of an Al-6.10Mg-0.25Sc-0.1Zr alloy with fine grains, produced by a new asymmetrical rolling technology, were investigated by tensile tests and microscopy methods. The results show that new asymmetrical rolling can considerably enhance the high strain rate superplasticity. A maximum ductility of 3200% can be achieved at 500 °C and 5×10 −2 s −1 . Under the same cold rolling reduction (75%), although the maximum elongation is comparable to that of the traditionally rolled same materials, asymmetrical rolling can increase the optimum strain rate up to 10 times. The microstructure results show that, during superplastic deformation, low angle grain boundaries gradually transfer into high angle grain boundaries and the grains gradually orientate randomly. The excellent high stain rate superplasticity can be ascribe to the refined grains and the presence of nano-scaled Al 3 (Sc, Zr) particles which can stabilize the fine-grains during hot deformation. The grain boundary sliding is the predominant superplastic deformation mechanism in the studied alloy. |
Databáze: | OpenAIRE |
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