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Plasticity and Microcracking in Shock‐Loaded Alumina
Author(s) -
Longy F.,
Cagnoux J.
Publication year - 1989
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.1151-2916.1989.tb06254.x
Subject(s) - materials science , compaction , composite material , plasticity , intergranular corrosion , phase (matter) , shock (circulatory) , diffraction , deformation (meteorology) , shock wave , mineralogy , microstructure , optics , geology , medicine , chemistry , physics , organic chemistry , engineering , aerospace engineering
Using a 110‐mm‐diameter compressed‐gas gun, we performed two types of experiments on alumina samples. The first involved plate impacts with wave profile measurements made with a VISAR velocity interferometer. The second type was plate‐impact recovery experiments. SEM, TEM, and X‐ray diffraction analysis showed that grain plasticity begins below the Hugoniot elastic limit (HEL), leading to a compaction of the material. This compaction is not accompanied by microcracking in pure alumina up to 2 × HEL. In the case of alumina with an intergranular glassy phase, the deformation of the sample is accompanied by a microcracking of the glass. However, the microcracks are not interconnected at a stress level equal to 2 × HEL for an alumina with about 10% glassy phase.