Abstract
The present study was aimed at determining the mechanical behaviour of a weak matrix oxide/oxide CMC subjected to tensile and compressive loadings in the fibre direction and at identifying the damage mechanisms. The material consisted of Nextel™610 fibres (8 HSW) embedded in an alumina matrix, with a 49 % fibre volume fraction and 24±2 % total porosity. The average ultimate tensile stress and strain of the material were, respectively, 260±37MPa and 0.3±0.09 % under tensile loading and −261±69MPa and −0.19±0.04 % under compressive loading. Three types of pores were differentiated within the material: nanopores (13±1 %), micropores (6±2 %) and macropores (5±1 %). The latter appear to be the most detrimental for the material, enhancing delamination. The damage mechanisms of the material were assessed through SEM examination and in situ tensile tests.
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