| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-strength Ni-base alloy, a method of producing the high-strength Ni-base alloy, and a method of recovering a member made of a degraded Ni-base alloy. SOLUTION: The Ni-base alloy contains at least not more than 0.1 wt.% C, not more than 50 wt.% Fe, and not more than 30 wt.% Cr, and is strengthened by precipitates of aγ' phase (Ni<SB>3</SB>Al) or aγ" phase (Ni<SB>3</SB>Nb) or both, and aηphase (Ni<SB>3</SB>Ti) is thermodynamically stable in a temperature range of 800 to 900°C. In the Ni-base alloy having high strength and excellent ductility, the grain boundaries are zigzagged, that is a plurality of nodes exist along segments among adjacent three points of the grain boundaries, and the average particle size of theγ' phase (Ni<SB>3</SB>Al) or theγ" phase (Ni<SB>3</SB>Nb) within crystal grains is not more than 100 nm. COPYRIGHT: (C)2011,JPO&INPIT
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