Effect of dispersed liquid B{sub 2}O{sub 3} particles on high-temperature mechanical behavior of copper bicrystals
- Univ. of Electro-Communications, Tokyo (Japan). Dept. of Mechanical and Control Engineering
- RWTH, Aachen (Germany). Inst. fuer Metallkunde und Metallphysik
Orientation controlled Cu bicrystals with dispersed B{sub 2}O{sub 3} particles, where B{sub 2}O{sub 3} behaves liquid-like at high temperature, were tensile tested at elevated temperatures. The fracture strain tended to decrease with increasing temperature and misorientation angle, and with decreasing strain rate. At lower temperatures where B{sub 2}O{sub 3} behaves like a solid, the occurrence of grain-boundary fracture was understood by the difference of the time constant for saturated grain-boundary sliding to provide stress concentration sites to promote voids and cracks. Furthermore, at higher temperatures where B{sub 2}O{sub 3} behaves liquid-like, the occurrence of grain-boundary fracture was explained by the loss of grain-boundary strength due to the increasing density of the grain-boundary area fraction of liquid particles and/or formation of liquid film at the grain boundary induced by grain-boundary sliding and migration. The liquid particles on the grain boundary seemed not to impede extensive grain-boundary sliding.
- OSTI ID:
- 329077
- Journal Information:
- Acta Materialia, Vol. 47, Issue 3; Other Information: PBD: 5 Feb 1999
- Country of Publication:
- United States
- Language:
- English
Similar Records
Temperature dependence of ductility and fracture of Cu-SiO[sub 2] bicrystals with [001] twist boundaries
Magneto-optical study of flux penetration and critical current densities in [001] tilt YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} thin-film bicrystals