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High energy impact techniques application for surface grain refinement in AZ91D magnesium alloy

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Abstract

A nanostructured surface layer was fabricated on magnesium alloy AZ91D by using the high-energy impact technique (HEIT). With the help of transmission electron microscope (TEM) and high-resolution transmission electron microscope (HRTEM), the microstructure features of the surface layer were systematically observed and characterized in different stages of microstructure evolution. The result revealed the mechanism of grain refinement and strain accommodation. The process of grain refinement, accompanied by an increase in strain in the surface layer, resulted from several processes. The onset of \( \{ 01\ifmmode\expandafter\bar\else\expandafter\=\fi{1}2\} \) deformation twinning and the intersection with \( \{ 10\ifmmode\expandafter\bar\else\expandafter\=\fi{1}1\} \) twins system are one of them. The operation of \( {\left\langle {11\ifmmode\expandafter\bar\else\expandafter\=\fi{2}0} \right\rangle }{\left( {0001} \right)} \) basal slip and \( {\left\langle {11\ifmmode\expandafter\bar\else\expandafter\=\fi{2}3} \right\rangle }(1\ifmmode\expandafter\bar\else\expandafter\=\fi{1}02)/(0\ifmmode\expandafter\bar\else\expandafter\=\fi{1}1\ifmmode\expandafter\bar\else\expandafter\=\fi{2}) \) pyramidal slip led to the formation of dislocation cells and low-angle dislocation boundaries. The successive subdivision of grains to a finer scale resulted in the formation of highly disoriented nanocrystalline grains. The mechanism of grain refinement was interpreted in terms of the structural subdivision of grains together with dynamic recrystallization. The minimum size of such refined grains was about 40 nm.

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Acknowledgements

This research was supported by National Natural Science Foundation of China (50471070, 50644041), Shanxi Province Youth Science and Technology Foundation (20041023), and Shanxi Province Key Laboratory Opening Foundation.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, People’s Republic of China

    Li-feng Hou, Ying-hui Wei, Bao-sheng Liu & Bing-she Xu

  2. Key Laboratory of Interface Science and Engineering in Advanced Materials of Taiyuan University of Technology, Ministry of Education, Taiyuan, 030024, People’s Republic of China

    Li-feng Hou, Ying-hui Wei & Bing-she Xu

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  1. Li-feng Hou
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Correspondence to Ying-hui Wei.

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Hou, Lf., Wei, Yh., Liu, Bs. et al. High energy impact techniques application for surface grain refinement in AZ91D magnesium alloy. J Mater Sci 43, 4658–4665 (2008). https://doi.org/10.1007/s10853-008-2668-0

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