wall to form a repair structure wherein a high temperature oxidation resistance of the second alloy is greater than a high temperature oxidation resistance of the first alloy and wherein the repair structure has a crystallographic orientation that is substantially the same as a crystallographic orientation of the tip wall application_number US 55086909 A description referring to the drawings wherein identical reference numerals denote the same elements throughout the various views fig1 and 2 illustrate an exemplary turbine blade 10 the turbine blade 10 includes a conventional dovetail 12 which may have any suitable form including tangs that engage complementary tangs of a dovetail slot in a rotor disk not shown for radially retaining the blade 10 to the disk as it rotates during operation a blade shank 14 extends radially upwardly from the dovetail 12 and terminates in a platform 16 that projects laterally outwardly from and surrounds the shank 14 a hollow airfoil 18 extends radially outwardly from the platform 16 the airfoil 18 has an outer wall comprising a concave pressure side outer wall 20 and a convex suction side outer wall 22 joined together at a leading edge 24 and at a trailing edge 26 the trailing edge 26 may incorporate trailing edge cooling passages such as the illustrated holes 28 the airfoil 18 has a root 30 and a tip 32 the radially outermost portion of the airfoil 18 defines a peripheral tip wall 34 sometimes referred to as a u201c squealer tip u201d a tip cap 36 closes off the interior of the airfoil 18 and lies.