Superplastic Deformation Mechanisms in Fine-Grained 2050 Al-Cu-Li Alloys

Abstract

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.

Cooling rate as a process parameter in advanced roll forming to tailor microstructure, mechanical and corrosion properties of EN AW 7075 tubes

“…Severe plastic deformation techniques such as friction stir welding and friction stir processing were employed to reduce the grain size in metallic materials. By optimization of hot rolling and friction stir processing parameters, the superplastic behavior of materials was achieved [13,18]. Equal-channel angular pressing was also utilized to improve the mechanical properties of additively manufactured aluminum alloy [19].…”