Article with material absorption cavities to reduce buckling during diffusion bonding

A bonded article, having at least a first sub component and a second sub component, the sub components bonded together at a bond plane, which comprises:

• the first sub component having a first wall, the first wall having an inside surface and a plurality of protrusions projecting from the inside surface which terminate adjacent the bond plane;
• the second sub component having a second wall, the second wall having an inside surface and a plurality of protrusions projecting from the inside surface that terminate adjacent the bond plane wherein the protrusions of the said first component are adjacent the protrusions of said second component when the two components are aligned in preparation for bonding;
• a plurality of supports created by the first wall protrusions and the second wall protrusions that are aligned relative to each other and bonded;
• at least one primary cavity defined by the supports;
• at least one material absorption cavity having a smaller cross section than the primary cavity, the cavities configured so that the weight of the article is minimized, the wall having a reduced wall thickness adjacent to the material absorption cavity relative to the wall thickness adjacent said primary cavity prior to bonding, so that the material absorption cavity absorbs material that yields when the article sub components are diffusion bonded together to prevent buckling of the walls.