Hybrid titanium alloy matrix composites
AssigneeAvco Lycoming/Subsidiary of Textron, Inc.
InventorsDan G. Rosenthal, Joseph A. Goebel
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Abstract
A combination of unique properties of (i) high strength and stiffness at temperatures up to about of 1500.degree. F., (ii) good room temperature mechanical properties including good ductility and (iii) improved resistance to matrix cracking is achieved in a titanium structure by forming a hybrid titanium alloy matrix composite in which the matrix consists of layers of at least two alloys, i.e. a high temperature-resistant titanium aluminide alloy and a ductile, lower modulus titanium alloy, that are bonded metallurgically to each other in various embodiments. A reinforcing material in the form of filaments, fibers or wiskers, e.g. silicon carbide, can be embedded within either or both types of the titanium layers.
Claims32
A hybrid titanium metal matrix composite article having good strength at temperatures up to about 1500.degree. F. and good ductility comprising at least one layer of a titanium aluminide alloy having a minimum thickness of at least about 0.001 inch metallurgically bonded to at least one layer of a ductile titanium alloy, said composite article having substantially higher yield strength, ultimate tensile strength and % elongation ductility than said layer of titanium aluminide alloy at both room temperature and at 1200.degree. F., and having substantially higher yield strength and ultimate tensile strength at 1200.degree. F. than said layer of ductile titanium alloy has at 1000.degree. F.
Dependencies are inferred from the claim text.