In-situ surface study on the mechanism of high-strain-rate superplasticity in an Al–Cu–Li alloy

An elongation of 880 % was obtained at a high initial strain rate of 1 × 10−2 s−1 at 470 °C in an Al–Cu–Li alloy produced by traditional thermomechanical-processing. The high-strain-rate superplastic deformation mechanisms during the whole deformation process were studied by SEM, EBSD, and FIB techn...

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Bibliographic Details
Published in:Journal of materials research and technology 2024-01, Vol.28, p.2815-2818
Main Authors: Shen, Zhixin, Zou, Guotong, Dong, Yu, Zhang, Yujia, Ye, Lingying
Format: Article
Language:English
Subjects:
Grain boundaries
Metals and alloys
Microstructure
Superplastic deformation
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Summary:An elongation of 880 % was obtained at a high initial strain rate of 1 × 10−2 s−1 at 470 °C in an Al–Cu–Li alloy produced by traditional thermomechanical-processing. The high-strain-rate superplastic deformation mechanisms during the whole deformation process were studied by SEM, EBSD, and FIB techniques. High-resolution surface studies employing focused ion beams reveal that grain boundary sliding accounts for up to 70 % of the overall strain. Furthermore, this phenomenon consistently maintains a high level, with a minimum value of 56 %, throughout the entire deformation process. Meanwhile, diffusion creep plays an accommodating role and stimulates the formation of striated bands.
ISSN:2238-7854
DOI:10.1016/j.jmrt.2023.12.204