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Fracture Properties of Polycrystalline Lithia‐Stabilized β “‐ Alumina
Author(s) -
VIRKAR ANIL V.,
GORDON RONALD S.
Publication year - 1977
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.1151-2916.1977.tb16094.x
Subject(s) - materials science , transgranular fracture , fracture (geology) , grain size , crystallite , composite material , hot pressing , sintering , perpendicular , grain boundary , metallurgy , microstructure , intergranular fracture , geometry , mathematics
The critical stress‐intensity factor, K 1C , and the fracture strength, σ f , have been investigated on both hot‐pressed and sintered lithia‐stabilized β ”‐alumina. The hot‐pressed material possessed a strong preferred orientation with many of the basal planes aligned perpendicular to the direction of hot‐pressing. Both K 1C and σ f were found to be orientation‐dependent. Two regimes of fracture were identified. In fine‐grained material (<120 μm), the strength was slightly dependent on grain size. For larger grain sizes, the strength decreased rapidly with increasing grain size and the fracture mode was almost entirely transgranular. The K 1C values for sintered β ”‐alumina were in the same range as those obtained on the hot‐pressed material.