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THE EFFECT OF MICROSTRUCTURE ON FRACTURE TOUGHNESS OF POLYCRYSTALLINE ALUMINA
Author(s) -
Nicoletto G.,
Tucci A.,
Esposito L.
Publication year - 1996
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1996.tb00937.x
Subject(s) - microstructure , materials science , fracture toughness , composite material , crystallite , indentation , cracking , fracture (geology) , bending , toughness , fracture mechanics , metallurgy
— A study of the dependence of the fracture toughness on the microstructural morphology of polycrystalline materials is presented. The microstructure of several aluminas was characterized by thermal etching and image analysis. The fracture toughness of these materials was then determined by bridge‐indentation pre‐cracking followed by a four‐point bending test procedure. A SEM investigation of the mechanisms of crack propagation was also carried out. The observed microstructure‐related fracture toughness responses are discussed.