Abstract: A method of bonding superalloys is provided. The method includes: aligning a first superalloy subcomponent having a gamma-prime solvus g?1 and a second superalloy subcomponent having a gamma-prime solvus g?2, with a filler material that includes at least 1.5 wt % boron disposed between the first and second superalloy subcomponents; performing a first heat treatment at a temperature T1, where T1 is above the solidus of the filler material and below the liquidus of the filler material; and performing a second heat treatment at a temperature T2, where T2 is greater than T1, and where T2 is greater than or equal to the lower of g?1 and g?2.

Abstract: A method of bonding superalloys is provided. The method includes: aligning a first superalloy subcomponent having a gamma-prime solvus g?1 and a second superalloy subcomponent having a gamma-prime solvus g?2, with a filler material that includes at least 1.5 wt % boron disposed between the first and second superalloy subcomponents; performing a first heat treatment at a temperature T1, where T1 is above the solidus of the filler material and below the liquidus of the filler material; and performing a second heat treatment at a temperature T2, where T2 is greater than T1, and where T2 is greater than or equal to the lower of g?1 and g?2.

Abstract: In an exemplary embodiment, a high temperature oxidation and hot corrosion resistant MCrAlX alloy is disclosed, wherein M comprises cobalt and X comprises, by weight of the alloy, from about 0.001 percent to less than 0.19 percent yttrium. In these alloys, X may also optionally include silicon, including, by weight of the alloy, up to about 1.5 percent. In another exemplary embodiment, a coated article is disclosed. The coated article includes a substrate having a surface. The article also includes a bond coat disposed on the surface. The bond coat comprises a high temperature oxidation and hot corrosion resistant MCrAlX alloy, wherein M comprises cobalt and X comprises, by weight of the alloy, from about 0.001 percent to less than 0.19 percent yttrium.