What is the main reason for the limited use of boron fiber-reinforced MMC’s?

What is the main reason for the limited use of boron fiber-reinforced MMC’s? Correct Answer Difficulty to control the chemical reaction

Boron fiber-reinforced MMCs have been developed for 20 years. However, their use is limited due to difficulty in controlling the chemical reaction between the molten metal and fibers. The mechanical properties of the composite get worsened due to the formation of a brittle phase resulting from the chemical reaction.
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