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Creep at the Mesoscopic and Microscopic Scale of 2.5D C_f-SiC

机译:2.5D C_f-SiC介观和微观尺度的蠕变

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摘要

Investigations at the mesoscopic and microscopic scales are necessary to perform in order to explain the macroscopic creep behavior of 2.5D CrSiC composites. Five modes of matrix microcracking and fiber pull-out are observed with different features regarding the fiber surface. The damage accumulation via matrix microcracking appears to be a time dependent mechanism. At 1473K and 220 MPa the pyrocarbon interphase is fractured leading to a debonding between carbon layers, while at 1673K there is a loss of anisotropy of the pyrocarbon layer and an interfacial sliding appearing as a viscous flow.
机译:为了解释2.5D CrSiC复合材料的宏观蠕变行为,有必要进行介观和微观尺度的研究。观察到五种模式的基质微裂纹和纤维拉出,它们在纤维表面上具有不同的特征。通过基质微裂纹的损伤积累似乎是时间依赖性的机制。在1473K和220 MPa时,热解碳的中间相破裂,导致碳层之间的剥离,而在1673K时,热解碳层的各向异性消失,界面滑动以粘性流的形式出现。

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