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Title: 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}
}