Abstract: A combination of unique properties of (i) high strength and stiffness at temperatures up to about 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 whiskers, e.g. silicon carbide, can be embedded within either or both types of the titanium layers.

Abstract: Honeycomb structure assemblies comprising walled structures which admit fluid such as air for purposes of cooling or heating the walls thereof or for other purposes. The assemblies comprise spaced inner and outer walls united by means of an internal honeycomb structure comprising aligned cells having opposed interior and exterior gaps open to adjacent cells, which causes the admitted fluid to undulate through said gaps into contact with both of the walls, such as for uniform cooling or heating. The honeycomb structure contains flanges which are secured to one or both walls for uniform strength and resistance to separation under the stress of use.

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.