NDLI: Comparison of dynamic fatigue behavior between sic whisker-reinforced composite and monolithic silicon nitrides

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Comparison of dynamic fatigue behavior between sic whisker-reinforced composite and monolithic silicon nitrides

Content Provider	NASA Technical Reports Server (NTRS)
Author	Salem, Jonathan A. Choi, Sung R.
Copyright Year	1991
Description	The dynamic fatigue behavior of 30 vol percent silicon nitride whisker-reinforced composite and monolithic silicon nitrides were determined as a function of temperature from 1100 to 1300 C in ambient air. The fatigue susceptibility parameter, n, decreased from 88.1 to 20.1 for the composite material, and from 50.8 to 40.4 for the monolithic, with increasing temperature from 1100 to 1300 C. A transition in the dynamic fatigue curve occurred for the composite material at a low stressing rate of 2 MPa/min at 1300 C, resulting in a very low value of n equals 5.8. Fractographic analysis showed that glassy phases in the slow crack growth region were more pronounced in the composite compared to the monolithic material, implying that SiC whisker addition promotes the formation of glass rich phases at the grain boundaries, thereby enhancing fatigue. These results indicate that SiC whisker addition to Si3 N4 matrix substantially deteriorates fatigue resistance inherent to the matrix base material for this selected material system.
File Size	9197643
Page Count	22
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19910009980
Archival Resource Key	ark:/13960/t5s808w6x
Language	English
Publisher Date	1991-02-01
Access Restriction	Open
Subject Keyword	Nonmetallic Materials Grain Boundaries Whisker Composites Dynamic Characteristics Fatigue Materials Glass Silicon Nitrides Fracture Strength Fractography Matrix Materials Crack Propagation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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