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作者:

Lu, Junxia (Lu, Junxia.) | Zhu, Qi (Zhu, Qi.) | Wang, Jin (Wang, Jin.) | Wei, Hua (Wei, Hua.) | Wang, Jiangwei (Wang, Jiangwei.) | Zhang, Yuefei (Zhang, Yuefei.) | Zhang, Ze (Zhang, Ze.)

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摘要:

Crack dynamics typically controls the deformation and fracture of nanocrystalline (NC) metallic materials, while the ubiquitous interplay between nanograins and propagating cracks remains unclear. Here, using in situ nanomechanical testing inside transmission electron microscope, we clarify the atomistic interplay between GB evolution and crack propagation in NC silver (Ag) thin films, where the cooperative GB migration, GB re-orientation and nanograin nucleation activated ahead of the crack tip result in conspicuous crack blunt. This grain-crack interplay is critically facilitated by the diffusive plasticity associated with crack propagation, which yields dynamically modified crack tip morphology and rate-limiting intragranular cracking. These atomistic mechanisms of diffusive crack-grain interplay enrich our understanding of the cooperative deformation behaviors in nanograin regime and hold general implications to enhance the fracture resistance of NC metallic materials. © 2021

关键词:

Grain boundaries Silver compounds Crack tips Morphology Crack propagation Deformation High resolution transmission electron microscopy Silver Thin films Nanocrystalline materials Behavioral research Nanocrystals

作者机构:

  • [ 1 ] [Lu, Junxia]Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing; 100124, China
  • [ 2 ] [Zhu, Qi]Center of Electron Microscopy and State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou; 310027, China
  • [ 3 ] [Wang, Jin]Center of Electron Microscopy and State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou; 310027, China
  • [ 4 ] [Wei, Hua]Center for Hypergravity Experimental and Interdisciplinary Research, Zhejiang University, Hangzhou; 310027, China
  • [ 5 ] [Wang, Jiangwei]Center of Electron Microscopy and State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou; 310027, China
  • [ 6 ] [Zhang, Yuefei]Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing; 100124, China
  • [ 7 ] [Zhang, Ze]Center of Electron Microscopy and State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou; 310027, China

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来源 :

Materialia

年份: 2021

卷: 17

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