A turbine nozzle formed of a superalloy, and including: an annular end-wall including a pocket, the pocket defining an inner surface within the annular end-wall; a vane, the vane including an airfoil portion and a boss portion, the vane extending from the pocket such that the boss portion is enclosed within the pocket and the airfoil portion extends through the annular end-wall; and a seal within the pocket, the seal including one or more protrusions extending from the inner surface of the pocket and abutting the vane at one or both of the boss portion and the airfoil portion.