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A new regime for mechanical annealing and strong sample-size strengthening in body centred cubic molybdenum

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  • Ling Huang

    (Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano) & Hysitron Applied Research Center in China (HARCC), State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University)

  • Qing-Jie Li

    (Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano) & Hysitron Applied Research Center in China (HARCC), State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University)

  • Zhi-Wei Shan

    (Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano) & Hysitron Applied Research Center in China (HARCC), State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University)

  • Ju Li

    (Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano) & Hysitron Applied Research Center in China (HARCC), State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University
    Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.)

  • Jun Sun

    (Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano) & Hysitron Applied Research Center in China (HARCC), State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University)

  • Evan Ma

    (Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano) & Hysitron Applied Research Center in China (HARCC), State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University
    Johns Hopkins University)

Abstract

Because of crystal symmetry, body centred cubic (BCC) metals have large differences in lattice friction between screw and edge dislocations, and manifest generally different mechanical behaviours from face centred cubic (FCC) metals. Although mechanical annealing (significant drop in stored dislocation density in response to applied stress) has been observed in FCC metals, it has not been observed in BCC metals so far. Here we show that significant mechanical annealing does occur in BCC Mo pillars, when their diameters decrease to hundreds of nanometers. In addition, there exists a critical diameter for focused ion beam milled pillars, below which the strengthening exponent increases dramatically, from ~0.3 to ~1. Thus, a new regime of size effects in BCC metals is discovered that converges to that of FCC metals, revealing deep connection in the dislocation dynamics of the two systems.

Suggested Citation

  • Ling Huang & Qing-Jie Li & Zhi-Wei Shan & Ju Li & Jun Sun & Evan Ma, 2011. "A new regime for mechanical annealing and strong sample-size strengthening in body centred cubic molybdenum," Nature Communications, Nature, vol. 2(1), pages 1-6, September.
    • Handle: RePEc:nat:natcom:v:2:y:2011:i:1:d:10.1038_ncomms1557
    DOI: 10.1038/ncomms1557
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    Cited by:

    1. Yan Lu & Yongchao Chen & Yongpan Zeng & Yin Zhang & Deli Kong & Xueqiao Li & Ting Zhu & Xiaoyan Li & Shengcheng Mao & Ze Zhang & Lihua Wang & Xiaodong Han, 2023. "Nanoscale ductile fracture and associated atomistic mechanisms in a body-centered cubic refractory metal," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    2. Li Zhong & Yin Zhang & Xiang Wang & Ting Zhu & Scott X. Mao, 2024. "Atomic-scale observation of nucleation- and growth-controlled deformation twinning in body-centered cubic nanocrystals," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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