Microstructure / mechanical-property relationships and R-curve behavior in Si{sub 3}N{sub 4}/Si{sub 3}N{sub 4}(w) composites
Abstract
Fracture toughness of Si{sub 3}N{sub 4}-whisker-reinforced Si{sub 3}N{sub 4}-matrix composites were evaluated with various whisker contents. Toughness was observed to increase with increasing whisker content, reaching a maximum value of 8.8 MPa{radical}4 at 5 vol.% whisker content. Additional whisker content caused reduced toughness. A model based on microstructural features indicates that the observed dependence of toughness on whisker content is due to both whisker-toughening and matrix-grain-size effects. Composites with 5 vol.% whisker content showed a rising crack growth resistance (R-curve) behavior. This is believed to be a combined effect of crack bridging and crack deflection due to both elongated grains and reinforcing whiskers.
- Authors:
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE, Washington, DC (United States)
- OSTI Identifier:
- 10185016
- Report Number(s):
- ANL/CP-76346; CONF-9210175-1
ON: DE92041096
- DOE Contract Number:
- W-31109-ENG-38
- Resource Type:
- Technical Report
- Resource Relation:
- Conference: 24. international Society for the Advancement of Material and Process Engineering (SAMPE) technical conference,Toronto (Canada),20-22 Oct 1992; Other Information: PBD: Jun 1992
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; SILICON NITRIDES; FRACTURE PROPERTIES; NUMERICAL DATA; COMPOSITE MATERIALS; REINFORCED MATERIALS; WHISKERS; CRACK PROPAGATION; 360203; MECHANICAL PROPERTIES
Citation Formats
Singh, J P, Chu, C Y, Murphy, C, and Singh, D. Microstructure / mechanical-property relationships and R-curve behavior in Si{sub 3}N{sub 4}/Si{sub 3}N{sub 4}(w) composites. United States: N. p., 1992.
Web. doi:10.2172/10185016.
Singh, J P, Chu, C Y, Murphy, C, & Singh, D. Microstructure / mechanical-property relationships and R-curve behavior in Si{sub 3}N{sub 4}/Si{sub 3}N{sub 4}(w) composites. United States. https://doi.org/10.2172/10185016
Singh, J P, Chu, C Y, Murphy, C, and Singh, D. 1992.
"Microstructure / mechanical-property relationships and R-curve behavior in Si{sub 3}N{sub 4}/Si{sub 3}N{sub 4}(w) composites". United States. https://doi.org/10.2172/10185016. https://www.osti.gov/servlets/purl/10185016.
@article{osti_10185016,
title = {Microstructure / mechanical-property relationships and R-curve behavior in Si{sub 3}N{sub 4}/Si{sub 3}N{sub 4}(w) composites},
author = {Singh, J P and Chu, C Y and Murphy, C and Singh, D},
abstractNote = {Fracture toughness of Si{sub 3}N{sub 4}-whisker-reinforced Si{sub 3}N{sub 4}-matrix composites were evaluated with various whisker contents. Toughness was observed to increase with increasing whisker content, reaching a maximum value of 8.8 MPa{radical}4 at 5 vol.% whisker content. Additional whisker content caused reduced toughness. A model based on microstructural features indicates that the observed dependence of toughness on whisker content is due to both whisker-toughening and matrix-grain-size effects. Composites with 5 vol.% whisker content showed a rising crack growth resistance (R-curve) behavior. This is believed to be a combined effect of crack bridging and crack deflection due to both elongated grains and reinforcing whiskers.},
doi = {10.2172/10185016},
url = {https://www.osti.gov/biblio/10185016},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jun 01 00:00:00 EDT 1992},
month = {Mon Jun 01 00:00:00 EDT 1992}
}