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Compressive superplastic deformations of nano-size Si 3 N 4 ceramics with different amounts of sintering additives were investigated at 1500°C. The stress exponents of all specimens were determined to be ∼2 in the lower stress region, and ∼1 in the higher stress region, while the dependency of strain rates on additive contents was observed only in the higher stress region. This indicates...
The superplastic deformation of nano-sized (∼68nm) Si 3 N 4 ceramics has been studied in compression over a wide range of strain rates and temperatures. The experimental results revealed, for the first time, a transition in the stress exponent (n) at each temperature. The n values decreased from ∼2 to ∼1 with increasing stress. The activation energy was also different for the two regions,...
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