Abstract Interlayers of malleable tantalum-, columbium-, aluminum-, or titanium-base metals are employed between layers of high-yieldstrength aluminum-, titanium-, or zirconium-base metals and dissimilar layers of high-yield-strength-iron-, nickel-, or aluminum-base metals to provide metallurgically bonded metal composites having good shear strength and superior resistance to impact loading. The composites are useful, e.g., as transition joints, and are used to best advantage where gas-tight tubular transition joints are required. Transition joints composed of high-yield-strength titanium- or aluminum-base metals bonded to high-yield-strength stainless steel via an interlayer of tantalum- or columbium-base metal exhibit outstanding lowtemperature properties, and composites of high-yield-strength zirconium-base metals bonded to such stainless steels via the same interlayers make superior transition joints for nuclear applications.
A metal composite comprising a first tubular layer of an Al-base metal, a second tubular layer of a face-centered cubic stainless steel, and a ring-shaped interlayer of a metal selected from the group consisting of malleable Ta- and Cb-base metals sandwiched between and metallurgically bonded to the ends of said tubular layers, the bond between said second tubular layer and said interlayer being a continuous wavy bond characterized by a regular wave pattern and comprising at least about 70 percent direct metal-to-metal bond, with solidified melt bond substantially uniformly distributed in periodic regions spaced between areas of such direct bonding, said composite having a shear strength greater than 75 percent of that of aluminum and being capaBle of maintaining its bond integrity at each interface when impacted with a chisel.
Claim 2
Dependent Claim
16 words
A three-layered composite of claim 1 wherein said second outer layer is a high-yield-strength Ni-base metal.
Claim 3
Dependent Claim
16 words
A three-layered composite of claim 1 wherein said second outer layer is a high-yield-strength Fe-base metal.