Journal
MATERIALS
Volume 13, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/ma13122705
Keywords
Al-Cu-Li alloys; superplasticity; creep diffusion; grain boundary sliding; focused ion beams
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Funding
- National Key Research and Development Program of China [2017YFB0306300]
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The deformation behavior and microstructural evolution of fine-grained 2050 alloys at elevated temperatures and slow strain rates were investigated. The results showed that significant dynamic anisotropic grain growth occurred at the primary stage of deformation. Insignificant dislocation activity, particle-free zones, and the complete progress of grain neighbor switching based on diffusion creep were observed during superplastic deformation. Quantitative calculation showed that diffusion creep was the dominant mechanism in the superplastic deformation process, and that grain boundary sliding was involved as a coordination mechanism. Surface studies indicated that the diffusional transport of materials was accomplished mostly through the grain boundary, and that the effect of the bulk diffusion was not significant.
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