Investigation on crack propagation in single crystal Ag with temperature dependence

Xue Feng Liu, Jib Bao Wang, Li Gang Sun, Ying Yan Zhang, Mei Ling Tian, Xiao Qiao He

    Research output: Contribution to journalArticlepeer-review

    6 Citations (Scopus)

    Abstract

    Crack propagation behaviors in a precracked single crystal Ag under mode I loading at different temperatures are studied by molecular dynamics simulation. The simulation results show that the crack propagation behaviors are sensitive to external temperature. At 0 K, the crack propagates in a brittle manner. Crack tip blunting and void generation are first observed followed by void growth and linkage with the main crack, which lead to the propagation of the main crack and brittle failure immediately without any microstructure evolution. As the temperature gets higher, more void nucleations and dislocation emissions occur in the crack propagation process. The deformation of the single crystal Ag can be considered as plastic deformation due to dislocation emissions. The crack propagation dynamics characterizing the microstructure evolution of atoms around the crack tip is also shown. Finally, it is shown that the stress of the single crystal Ag changes with the crack length synchronously.
    Original languageEnglish
    Pages (from-to)3553-3563
    Number of pages11
    JournalJournal of Materials Research
    Volume30
    Issue number22
    DOIs
    Publication statusPublished - 2015

    Keywords

    • crystals
    • mechanical properties
    • nanostructured materials

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