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Non-octahedral-like dislocation glides in aluminum induced by athermal effect of electric pulse

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Abstract

The dislocation movements under the action of electric pulses (athermal effect) at cryogenic conditions were studied by ex situ transmission electron microscopy (TEM) observations and slip trace analysis innovatively. By applying electric pulses directly through aluminum TEM samples in a liquid nitrogen bath, plenty of non-octahedral-like dislocation glides generally forming at high temperatures (e.g., >453 K for aluminum) were observed at cryogenic temperatures (<130 K). Occurrence of the non-octahedral-like dislocation glides indicates a substantial increase in the degrees of freedom for dislocation glides, offering a new/complementary explanation for the acceleration effect of electric pulses on dislocation movements, especially in the sole athermal effect. In comparison, previous theories relied on extra driving force and/or increased dislocation mobility on the octahedral planes in a face-centered cubic metal. The athermal effects of electric pulse were discussed and the selective heating at the dislocation cores was proposed to account for non-octahedral-like dislocation glides.

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ACKNOWLEDGMENTS

The research was supported by the National Science Foundation of China (NSFC) under Project No. 51471107, 50971090 and by Center for Compression Science, Chinese Academy of Engineering Physics (Grant No. YK 2015–0602005), and by State Key Development Program for Basic Research of China (973 Programs) (Grant No. 2012CB619600).

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Authors and Affiliations

  1. State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People’s Republic of China

    Wei Li, Yao Shen, Haiting Liu & Chaoying Xie

  2. Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai, 200240, People’s Republic of China

    Wei Li, Yao Shen, Haiting Liu & Chaoying Xie

  3. National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, Sichuan, 621900, People’s Republic of China

    Yuan Wang & Wenjun Zhu

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  1. Wei Li
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  2. Yao Shen
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  3. Haiting Liu
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  4. Yuan Wang
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Correspondence to Yao Shen.

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Li, W., Shen, Y., Liu, H. et al. Non-octahedral-like dislocation glides in aluminum induced by athermal effect of electric pulse. Journal of Materials Research 31, 1193–1200 (2016). https://doi.org/10.1557/jmr.2016.90

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