Nanocreep of carbon fibres in 2.5D C{sub}f-SiC

摘要

In this paper we give information on the role of the carbon fibers as there is no change in the silicon carbide microstructure during creep tests of 2.5D C{sub}f-SiC composites in the 1273-1673K and 110-220 MPa domains. After tensile creep tests,one observes by HREM an increase of the mean diameter of the basic structural units and of the local molecular orientations. In fact these changes do not lead to a macroscopic strain. Therefore this restructuration effect has been called nanocreep of thecarbon fiber.