Sufficient transference of stress and no harmful reaction at the interface between the reinforcement and the matrix are simultaneously required in an FRM. Alloying Si, Mg, Cu or Fe in Al is effective in restrain the harmful Al
4C
3 in a C-Al FRM. Adding 2-3% Li in Al is useful to improve the wettability and also to control the reaction between the Al
2O
3 fibre and the Al matrix. A B
4C or SiC barrier can suppress the AlB
2 in B-Al. However neither of the barriers is of any use for a Ti matrix. On the other hand, Al, Mo or V in Ti can lessen the reaction. A metal filament such as W or Mo can only be applied to a superalloy matrix. The filament, however, is easily deteriorated by Ni, Co or Al which is the main composition of the superalloy. The deterioration can be restrained by dispersing ZrO
2 in the W filament or by coating a ZrO
2 barrier on the filament.
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