Microstructure-property relation in alumina ceramics during post-annealing process after laser shock processing

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

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Laser shock processing (LSP) is a new surface engineering approach to introduce significant compressive residual stress into ceramics to improve their mechanical properties. However, LSP of ceramics may induce microcracks, which limit the further improvement of mechanical properties of ceramics. In this research, the effect of a post-LSP annealing process on α-Al2O3 ceramics was investigated. The annealing treatment can cause thermal relaxation of compressive residual stress generated by LSP while still maintain the positive attribute of LSP. The compressive residual stress was stabilized after annealing after 10 hours at 1100-1300°C. The healing of microcracks in α-Al2O3 ceramics was observed during the post-LSP annealing process, which is caused by diffusion bonding mechanisms and accompanied by dislocation and void formation. The combination of the stabilized compressive residual stress and microcrack healing can improve the cracking resistance of α-Al2O3 ceramics to mechanical impact on the surface by 69%.

Original languageEnglish (US)
Pages (from-to)4933-4941
Number of pages9
JournalJournal of the American Ceramic Society
Volume101
Issue number11
DOIs
StatePublished - Nov 2018

Keywords

  • annealing
  • laser shock processing
  • mechanical properties
  • microstructures
  • residual stress

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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