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Macrodeformation twinning in a textured aluminum alloy via dynamic equal channel angular pressing

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Abstract

Dynamic equal channel angular pressing experiments are conducted on an aluminum alloy with impact directions (ID) parallel to the rolling direction (RD), transverse direction (TD) and normal direction (ND), referred to as the ID\(\parallel \)RD, ID\(\parallel \)TD and ID\(\parallel \)ND loading, respectively. Anisotropic deformation twinning is observed as a result of texture and grain elongation along RD, and the deformation twins can be activated both at grain boundaries and within grain interiors. Large-sized deformation twins (tens of \(\mu \)m long) form in the ID\(\parallel \)RD sample, while few twins are observed in the ID\(\parallel \)TD and ID\(\parallel \)ND samples during rapid severe plastic deformation. Molecular dynamics simulations are conducted to explain the effects of crystallographic orientations and grain geometry on deformation twinning. The resolved shear stress analysis shows that deformation twinning is easier to occur when the impact direction is along [001] and [110] than [111], and a larger grain dimension along the impact direction leads to a bigger twin size.

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Acknowledgements

This work was sponsored in part by the National Key R&D Program of China (No. 2017YFB0702002), the Scientific Challenge Project of China (No. TZ2018001) and the National Natural Science Foundation of China (No. 11627901).

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Authors and Affiliations

  1. Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu, 610031, Sichuan, People’s Republic of China

    D. K. Qi, L. Lu & S. N. Luo

  2. The Peac Institute of Multiscale Sciences, Chengdu, 610031, Sichuan, People’s Republic of China

    D. K. Qi, M. X. Tang, L. Lu, F. Zhao & S. N. Luo

  3. College of Science, Hunan Agricultural University, Changsha, 410128, Hunan, People’s Republic of China

    L. Wang

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  1. D. K. Qi
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  3. L. Lu
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  4. F. Zhao
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  5. L. Wang
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Correspondence to L. Lu or L. Wang.

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Qi, D.K., Tang, M.X., Lu, L. et al. Macrodeformation twinning in a textured aluminum alloy via dynamic equal channel angular pressing. J Mater Sci 54, 4314–4324 (2019). https://doi.org/10.1007/s10853-018-3102-x

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