| 摘要 |
A Ni-based single crystal alloy having a coating film for preventing recrystallization fracture being capable of preventing the intergranular fracture resulting from recrystallization, which comprises a Ni-based single crystal alloy containing none or a trace amount of a grain boundaryreinforcing metal and, coated on the surface thereof, a coating film of a Nibased alloy containing at least one of the grain boundary-reinforcing elements composed of the group consisting of Zr, Hf, B and C, wherein the above grain boundary-reinforcing element is dispersed only on the surface of the above Nibased single crystal alloy by a heat treatment of the coating film at a temperature which does not cause the recrystallization of the Ni-based single crystal alloy. |
