Fiber-reinforced, titanium based composites and method of formin

Details Fiber-reinforced, titanium based composites and method of formin Fiber-reinforced, titanium based composites and method of formin

1994-03-21

1995-09-05

Walsh, Donald P.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Making articles of indefinite length

419 10, 419 17, 419 5, 419 8, B22F 314

Patent

active

054476801

ABSTRACT:
Microcracks in fiber-reinforced/titanium aluminide matrix composite materials are inhibited by employing a matrix comprising a titanium aluminide alloy having (1) from ten to twelve atomic percent niobium and (2) a critical admixture of from two to six atomic percent of a member selected from a group consisting of molybdenum, tungsten and vanadium. The tendency of the fiber/matrix interfacial reaction to increase the stability of the Alpha 2 phase in the matrix adjacent to the interface and the tendency to form a "beta phase depletion zone" are unexpectedly negated. Suppression of the beta depletion zone formation inhibits the formation and growth of interfacial microcracks, and allows the fabrication of crack-free titanium matrix composite materials. The need for an extraneous beta phase stabilization treatment at the fiber/matrix interface is eliminated.

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