Premium
Laser shock processing of polycrystalline alumina ceramics
Author(s) -
Wang Fei,
Zhang Chenfei,
Lu Yongfeng,
Nastasi Michael,
Cui Bai
Publication year - 2017
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14630
Subject(s) - materials science , crystallite , ceramic , intergranular corrosion , indentation , residual stress , composite material , grain boundary , laser , shock (circulatory) , cracking , deformation (meteorology) , metallurgy , microstructure , optics , medicine , physics
Abstract Laser shock processing ( LSP ) has been applied to polycrystalline α‐Al 2 O 3 ceramics. X‐ray characterizations have revealed that LSP results in significant compressive residual stresses which can extend to a depth of more than 1.2 mm from the surface. The presence of compressive residual stresses improves the resistance of α‐Al 2 O 3 ceramics to indentation cracking. Microstructural characterization suggests that the majority of α‐Al 2 O 3 grains on the surface remains intact after LSP . However, damaged regions are occasionally present, which shows intergranular fractures and a limited plastic deformation in the vicinity of grain boundaries.