A fiber-reinforced composite material is produced, in which tungsten fibers are embedded in a Nb matrix. The

Question:

A fiber-reinforced composite material is produced, in which tungsten fibers are embedded in a Nb matrix. The composite is composed of 70 vol% tungsten.
(a) Calculate the wt% of tungsten fibers in the composite; and
(b) Suppose the composite is heated to 2600 °C and held for several years. What happens to the fibers? Explain.