Microstructure / mechanical-property relationships and R-curve behavior in Si{sub 3}N{sub 4}/Si{sub 3}N{sub 4}(w) composites
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.
- Research Organization:
- Argonne National Lab., IL (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 10185016
- Report Number(s):
- ANL/CP--76346; CONF-9210175--1; ON: DE92041096
- Country of Publication:
- United States
- Language:
- English
Similar Records
Mechanical properties and microstructure of Si sub 3 N sub 4 - whisker-reinforced Si sub 3 N sub 4 matrix composite
Mechanical properties of hot isostatically pressed Si[sub 3]N[sub 4] and Si[sub 3]N[sub 4]/SiC composites
Fabrication and properties of Si sub 3 N sub 4 composites reinforced by SiC whiskers and particles
Conference
·
Sun Dec 31 23:00:00 EST 1989
·
OSTI ID:5123916
Mechanical properties of hot isostatically pressed Si[sub 3]N[sub 4] and Si[sub 3]N[sub 4]/SiC composites
Journal Article
·
Sun Feb 28 23:00:00 EST 1993
· Journal of Materials Research; (United States)
·
OSTI ID:6710718
Fabrication and properties of Si sub 3 N sub 4 composites reinforced by SiC whiskers and particles
Conference
·
Sun Oct 01 00:00:00 EDT 1989
· Ceramic Engineering and Science Proceedings; (USA)
·
OSTI ID:7144280