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High‐Temperature Fatigue Fracture Initiation in MgO Single Crystals
Author(s) -
STINCHCOMB W. W.,
QUEENEY R. A.
Publication year - 1972
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.1151-2916.1972.tb13386.x
Subject(s) - materials science , cleavage (geology) , slip (aerodynamics) , composite material , fracture (geology) , lüders band , compressive strength , microstructure , thermodynamics , physics
The fatigue response of single‐crystal MgO in compressive‐compressive loading was characterized at 800° and 1300°C. Fracture initiation mechanisms were observed for specimens loaded in <001> and <111> directions; these loading directions independently activated the primary and secondary slip systems, respectively. For both loading directions, failure at 800°C resulted from cleavage cracks formed between parallel slipbands and that at 1300°C occurred at slipband intersections. At both temperatures, (111) <1 1 0> slip was observed for cyclic loading in the <111> direction.