Abstract
A metallic matrix composite material (2024-type aluminium alloy reinforced with 25 vol % SiC whiskers) wasin situ thermally cycled in a transmission electron microscope. Dislocation movements were observed between 180 and 400 °C. The local shear stress due to the difference between the thermal expansion coefficient of matrix and fibres is estimated from the radius of curvature of mobile dislocations. The experimental values of the internal stress are discussed.
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