Abstract
1. Carbon fibers in contact with a magnesium-base matrix experience no loss of strength during heating for 100–500 h at temperatures up to 400–450°C. In contrast to the aluminum-carbon-fibers system, 5-min contact with molten magnesium in the temperature range 660–780°C brings about no loss of fiber strength; interaction between the phases in this case is apparently restricted to diffusion across the interfaces. 2. In the temperature range 450–660°C carbon fibers vigorously react with a magnesium-base matrix, as a result of which their strength falls. The loss of strength suffered by carbon fibers during heat treatment for 100 h at 550°C may amount to 60–70% of their starting strength; under these conditions the cross-sectional area of the fibers decreases by 15–20%.
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