Cavitation in superplastic composites

Conference · Fri Dec 31 04:00:00 EST 1993

OSTI ID:143669

Iwasaki, Hajime ^[1]; Mabuchi, Mamoru ^[2]; Higashi, Kenji ^[3]

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1. Himeji Institute of Technology, Hyogo (Japan). Dept. of Materials Science and Engineering
2. Government Industrial Research Institute, Nagoya (Japan)
3. Univ. of Osaka Prefecture, Sakai (Japan). Dept. of Mechanical Engineering

The cavitation of superplastic 6061/Si{sub 3}N{sub 4p} deformed at several levels of stress and at a temperature of 833 K in a constant stress tensile test.These composites have been examined by measuring cavity volume fraction and by electron microscopic observation. Cavities have always formed at interfaces between matrix and particles. In specimens deformed at higher stress than 10 MPa, many lamellar cavities as well as cracks have appeared at interfaces in addition to granular cavities which have been observed over all stress levels. The lamellar crack-like cavities seem to be associated with rapid decreases of total elongation from 500% at a stress of 10 MPa to 300% at a stress of 11 MPa. It could be presumed that the lamellar cavities have been generated by excessive stress to some critical strength of the interface.

• OSTI ID: 143669
• Report Number(s): CONF-930246--; ISBN 0-87339-251-5
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPOSITE MATERIALS
DEFORMATION
INTERFACES
PLASTICITY
SILICON NITRIDES
TENSILE PROPERTIES