期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.06.070
关键词
Al-Mg-Sc-Zr alloy; Superplasticity; Grain boundary sliding; Asymmetrical rolling
类别
资金
- China Postdoctoral Science Foundation [2014M552149]
- China Young Talents Lift Engineering Project [CAST201636]
- Hunan Province Science Technology Innovation Talent Plan Project [2015RS4001]
- Natural Science Foundation of Hunan Province [2016JJ3151]
- Open-end Fund for the Valuable and Precision Instruments of Central South University [CSUZC201611]
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 degrees C and 5 x 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. (C) 2016 Elsevier B.V. All rights reserved.
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