Plastic Softening Induced by High-Frequency Vibrations Accompanying Uniaxial Tension in Aluminum

Ziyu Zhao, Jinxing Liu* (Corresponding Author), Amir Siddiq

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We have investigated the influences of high-frequency vibration (HFV) superimposed onto the monotonic uniaxial tension in single-crystal aluminum (Al) specimens by molecular dynamics simulations. It was found that HFV induces softening, i.e., reduction in peak stress. Similar to previous experimental results, the softening increases with the increasing HFV amplitude. Dependences on lattice orientation, tensile strain rate, and a preset notch are considered. Lattice orientation plays an important role in peak stress and plasticity. The evolution of the atomic structure reveals that dislocations have enough time to annihilate under a lower tensile strain rate, resulting in strong ups and downs in the strain–stress curves. Under a higher strain rate, newly appearing dislocations interact with previous ones before the latter annihilate, densifying the dislocation network. As a result, further dislocation motions and annihilations are considerably impeded, leading to a relatively smooth flow stage. Furthermore, by modifying the propagation direction of shear bands, a preset notch can strengthen the peak tensile stress under low-level amplitude HFVs.
Original languageEnglish
Article number1239
Number of pages12
JournalNanomaterials
Volume12
Issue number7
Early online date6 Apr 2022
DOIs
Publication statusPublished - 6 Apr 2022

Keywords

  • high-frequency vibrations
  • Lattice orientation
  • Strain rate sensitivity
  • preset notch
  • softening
  • molecular dynamics simulation

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