Abstract
The Cu-GeO2 alloy polycrystals containing plastically hard GeO2 particles are tensile tested to study intergranular fracture behavior of the alloys at intermediate temperatures. The effects of large GeO2 grain-boundary particles on the intergranular fracture are discussed using the specimens containing the particles of the fixed size (3 μm in diameter) and different area-fractions. The ductility of the Cu-GeO2 alloy polycrystals is larger than that of Cu polycrystals. The grain-boundary GeO2 particles improve the ductility by suppressing grain-boundary sliding. The grain-boundary voids to cause theintergranular fracture preferentially nucleate between the grain-boundary GeO2 particles. The ductility of the Cu-GeO2 alloys increases with increasing the area fraction of the grain-boundary GeO2 particles. The area-fraction dependence of the ductility is explained by considering the amount of GBS as a criterion of the intergranular fracture.
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Sato, H., Fujii, T., Onaka, S. et al. Effects of grain-boundary GeO2 particles on intergranular fracture of Cu-GeO2 polycrystals. Journal of Materials Science 38, 1689–1693 (2003). https://doi.org/10.1023/A:1023267408095
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DOI: https://doi.org/10.1023/A:1023267408095