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Influence of Hydrostatic Pressure and Humidity on Superplastic Ductility of Two β‐Spodumene Glass‐Ceramics
Author(s) -
WANG J.G.,
RAJ R.
Publication year - 1984
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.1151-2916.1984.tb19722.x
Subject(s) - materials science , superplasticity , composite material , ceramic , hydrostatic pressure , stress (linguistics) , ductility (earth science) , metallurgy , ultimate tensile strength , deformation (meteorology) , cavitation , hydrostatic stress , creep , alloy , linguistics , philosophy , physics , finite element method , mechanics , thermodynamics
The extent of superplastic deformation in two lithium aluminosilicate glass‐ceramics was found to be limited either by intergranular cavitation or by the initiation and growth of surface cracks. Tensile tests were performed under a superimposed hydrostatic pressure to distinguish between the two failure mechanisms. Two materials, one with a high flow stress and the other with a low flow stress, were studied. Cavitation was substantially suppressed by hydrostatic pressure in both materials. The strain‐to‐fracture, however, was enhanced only in the material with the lower flow stress. (In at least one instance the tensile ductility became almost infinite.) In the material with the higher flow stress, failure was caused by the initiation and propagation of cracks from the surface. The crack‐propagation mode of failure was found to be sensitive to humidity, raising the possibility of stress‐corrosion cracking at high temperatures in glass‐ceramic materials.