Deformation Mechanisms is a-Phase Silicon Nitride Ceramics
Conference
·
OSTI ID:5987
Changes of phase composition and morphology were investigated in Si{sub 3}N{sub 4} both before and after compressive deformation testing. Si{sub 3}N{sub 4} specimens, with 5 wt% Y{sub 2}O{sub 3} and 5 wt% MgAl{sub 2}O{sub 4} additives, were rapidly consolidated to preserve the initial, metastable {alpha}-phase present in the Si{sub 3}N{sub 4} starting powders. Constant strain rate compression tests were used to evaluate the strain rate dependency of the flow stress. At 1723 K, a flow stress dependency value of n = 2 was observed.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 5987
- Report Number(s):
- SAND99-8408C; TRN: AH200115%%354
- Resource Relation:
- Conference: Conference title not supplied, Conference location not supplied, Conference dates not supplied; Other Information: PBD: 12 Aug 1998
- Country of Publication:
- United States
- Language:
- English
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