Abstract
Using an original technique, new data for the interfacial reaction in B-Al composites have been obtained. Two stages of the boron fibre/aluminium interface reaction were revealed. In Stage 1, due to the aluminothermal reduction of the oxide film on the boron fibre, finecrystalline rhombohedral boron, alumina and dispersed aluminium borides are formed. The latter are formed by the reaction with the-fine-crystalline boron and do not affect the fibre strength but can contribute to a more intensive interaction. In Stage 2, borides are formed by direct reaction with the fibres, thus seriously reducing their strength.
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