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Effects of Temperature, Environment, and Orientation on the Fracture Toughness of Single‐Crystal YAG
Author(s) -
Mah TaiIl,
Parthasarathy Triplicane A.
Publication year - 1997
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/j.1151-2916.1997.tb03185.x
Subject(s) - fracture toughness , materials science , torr , composite material , fracture (geology) , toughness , orientation (vector space) , single crystal , crystallography , chemistry , thermodynamics , geometry , physics , mathematics
The fracture toughness of single‐crystal YAG was measured as a function of temperature in air and under vacuum using the SENB technique up to 1600°C. The measured KIC was 2.2 MPa·m 1/2 at room temperature and it increased with temperature above 1200°C, reaching a value of 4.5 MPa·m 1/2 at 1600°C in air. The effects of crystallo‐graphic orientation and oxygen partial pressure on tough‐ness were studied at 1600°C. The toughness increased further to 5.5 MPa·m 1/2 when tested under vacuum (10 ‐5 torr)at 1600°C. Both temperature and testing environments were found to influence the fracture toughness, but there was no significant effect of crystallographic orientation.