Localized plasticity in silicon carbide ceramics induced by laser shock processing

Fei Wang, Xueliang Yan, Chenfei Zhang, Leimin Deng, Yongfeng Lu, Michael Nastasi, Bai Cui

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

This paper investigates how laser shock processing (LSP) changes the microstructures and mechanical properties of polycrystalline α-SiC ceramics. Three-dimensional (3-D) topography suggests that the grain boundaries experience larger height changes and deformation than the grains after LSP. Transmission electron microscopy characterizations revealed dislocation activities near the surface and grain boundaries in LSP-treated SiC ceramics, suggesting that localized plasticity could be generated during the LSP process at room temperature. X-ray diffraction analysis shows that significant compressive residual stress was introduced in SiC surfaces, which could be extended to a depth of 750 µm below the surface. The LSP-induced localized plasticity can improve the mechanical properties of ceramics, such as the apparent fracture toughness and bending strength.

Original languageEnglish (US)
Article number100265
JournalMaterialia
Volume6
DOIs
StatePublished - Jun 2019

Keywords

  • Laser shock processing
  • Mechanical properties
  • Microstructures
  • Residual stress
  • Silicon carbide

ASJC Scopus subject areas

  • Materials Science(all)

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