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• W2113245462 abstract "Si3N4/SiC composites are ceramic materials that exhibit excellent performance for high-temperature applications. Prepared from an ultrafine amorphous Si-C-N powder, sintered materials are constituted mainly of a β-Si3N4 matrix with SiC inclusions and have a very small grain size (less than 1 μm). Such a microstructure is propitious for superplastic forming. Superplasticity has been studied in tension, from 1550° to 1650°C, under nitrogen atmosphere. Elongations over 100% have been achieved. In many cases, at the highest temperatures and slowest strain rates, materials are damaged by different processes, including microcracking, cavitation, and chemical decomposition. A map of the most suitable (strain-rate/temperature) domain has been established. It allows the prevention of any structural alteration by selecting carefully the testing conditions. Since specimens suffered considerable strain-induced hardening, sources for this phenomenon are examined. Although the experiments have involved high temperature and extensive strain, neither static nor dynamic grain growth has occurred. Crystallization of the amorphous grain-boundary phase, which is reported in most cases, may be invoked. However, based on microstructural observations, it is not the unique origin for flow hardening." @default.
• W2113245462 created "2016-06-24" @default.
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• W2113245462 date "1992-09-01" @default.
• W2113245462 modified "2023-10-13" @default.
• W2113245462 title "Tensile Ductility of Superplastic Al2O3-Y2O3-Si3N4/SiC Composites" @default.
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• W2113245462 doi "https://doi.org/10.1111/j.1151-2916.1992.tb05586.x" @default.
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