An exhaust gas variable geometry turbine assembly comprising: a shroud component (252, 520) that comprises an inner perimeter, an outer perimeter and a shroud component surface that extends from the inner perimeter to the outer perimeter; an annular component (251, 510) that comprises an inner perimeter, an outer perimeter, an annular component surface that extends from the inner perimeter to the outer perimeter, a number of bore openings disposed in the annular component surface and a corresponding number of bores; at least one spacer that defines a nozzle height of an exhaust gas nozzle defined by a planar portion of the shroud component surface and a planar portion of the annular component surface; and a number of pivotable vanes that define throats within the exhaust gas nozzle wherein each of the pivotable vanes comprises a corresponding post that is received at least in part by a corresponding one of the bores of the annular component (251,510), characterized in that: each of the posts is interference fit to a corresponding one of the pivotable vanes, and each of the pivotable vanes comprises a first alloy that comprises a first amount of nickel by mass, wherein each of the corresponding posts comprises a second alloy that comprises a second amount of nickel by mass and wherein the second amount of nickel by mass exceeds the first amount of nickel by mass such that the posts are less susceptible to sticking in the bores of the annular component (251, 510). a shroud component (252, 520) that comprises an inner perimeter, an outer perimeter and a shroud component surface that extends from the inner perimeter to the outer perimeter; an annular component (251, 510) that comprises an inner perimeter, an outer perimeter, an annular component surface that extends from the inner perimeter to the outer perimeter, a number of bore openings disposed in the annular component surface and a corresponding number of bores; at least one spacer that defines a nozzle height of an exhaust gas nozzle defined by a planar portion of the shroud component surface and a planar portion of the annular component surface; and a number of pivotable vanes that define throats within the exhaust gas nozzle wherein each of the pivotable vanes comprises a corresponding post that is received at least in part by a corresponding one of the bores of the annular component (251,510), characterized in that: each of the posts is interference fit to a corresponding one of the pivotable vanes, and each of the pivotable vanes comprises a first alloy that comprises a first amount of nickel by mass, wherein each of the corresponding posts comprises a second alloy that comprises a second amount of nickel by mass and wherein the second amount of nickel by mass exceeds the first amount of nickel by mass such that the posts are less susceptible to sticking in the bores of the annular component (251, 510). each of the posts is interference fit to a corresponding one of the pivotable vanes, and each of the pivotable vanes comprises a first alloy that comprises a first amount of nickel by mass, wherein each of the corresponding posts comprises a second alloy that comprises a second amount of nickel by mass and wherein the second amount of nickel by mass exceeds the first amount of nickel by mass such that the posts are less susceptible to sticking in the bores of the annular component (251, 510).