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Strengthening by refinement of lamellar thickness was studied at room temperature on dual phase Ti–39.4mol%Al alloy over a wide range of average lamellar thickness λ from 850 to 20 nm. The relation between yield stress σ y and λ was examined, paying special attention to the change in lamellar boundary structure. The γ/α 2 lamellar boundaries in the alloy are found to be perfectly coherent...
Microstructural changes that occurred during the sintering of alumina doped with TiO 2 and SiO 2 have been investigated. The kinetics of normal grain growth at the initial stage is retarded by the dopant segregation at the grain boundaries. However, due to the accumulation of dopants at the grain boundaries during grain growth, its concentration at the boundaries ultimately exceeds...
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