Machining-induced surface residual stress behavior in Al{sub 2}O{sub 3}-SiC nanocomposites
- Lehigh Univ., Bethlehem, PA (United States)
The machining and subsequent annealing behavior of an Al{sub 2}O{sub 3}-SiC nanocomposite (Al{sub 2}O{sub 3} + 5 vol% 0.2 {micro}m SiC particles) was compared to that of single-phase Al{sub 2}O{sub 3}. The machining-induced residual line force was determined by measuring the extent of elastic bending in thin disk specimens, and the surface roughness was evaluated by profilometry. The results showed that, when the two materials were subjected to the same grinding conditions, they developed compressive residual stresses and surface roughness values of similar magnitude. The maximum thickness of the residual stress layers was estimated to be {approximately}10 {micro}m for the Al{sub 2}O{sub 3} and {approximately}12 {micro}m for the nanocomposite. A direct linear correlation was observed between the residual force and the surface roughness for different machining treatments. Annealing of the machined samples produced complete relaxation of residual stresses in the single-phase Al{sub 2}O{sub 3}, whereas only partial stress relaxation occurred for the nanocomposite.
- Sponsoring Organization:
- Office of Naval Research, Washington, DC (United States); Electric Power Research Inst., Palo Alto, CA (United States)
- OSTI ID:
- 417749
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 9 Vol. 79; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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