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3D microstructure and crack pathways of toughened CaO–Al 2 O 3 –SiO 2 glass by precipitation of hexagonal CaAl 2 Si 2 O 8 crystal
Author(s) -
Maeda Kei,
Iwasaki Kenichiro,
Urata Shingo,
Akatsuka Kosho,
Yasumori Atsuo
Publication year - 2019
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.16393
Subject(s) - microstructure , materials science , perpendicular , composite material , hexagonal crystal system , shear (geology) , cleavage (geology) , crystallography , crystal (programming language) , precipitation , crystal structure , mineralogy , fracture (geology) , geometry , chemistry , mathematics , physics , meteorology , computer science , programming language
We investigated CaO–Al 2 O 3 –SiO 2 glass partially crystallized with molybdenum particles as nucleating agents. Microstructure of the material was characterized as a house‐of‐cards structure composed of plate‐like crystals. Microcracks propagated along the crystal plane parallel to the double layer of SiO 4 /AlO 4 tetrahedrons separated by layers of calcium atoms. To investigate the fracture behavior of the hexagonal CaAl 2 Si 2 O 8 crystals, molecular dynamics simulations were performed, which demonstrated that a crack can be easily triggered by shear deformation along the calcium layer. Additionally, once a crack was generated in the calcium layer, it propagated rapidly, whereas the crack perpendicular to the calcium layer hardly propagated. This simulated behavior is consistent with the experimentally observed cleavage behavior of the hexagonal CaAl 2 Si 2 O 8 crystal. The experimental and simulation results effectively explained the non‐elastic fracture behavior of the material.