Ni3Ai-Based Intermetallic Compound With Dual Multi-Phase Microstructure, Production Method Thereof, and Heat Resistant Structural Material
AssigneeOsaka Prefecture University Public Corporation
InventorsTakayuki Takasugi, Yasuyuki Kaneno
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Abstract
An intermetallic compound having excellent mechanical properties at high temperatures is provided. An intermetallic compound of the present invention contains greater than 5 at % and not greater than 13 at % of Al, not less than 9.5 at % and less than 17.5 at % of V, not less than 0 at % and not greater than 3.5 at % of Ti, not less than 0 weight ppm and not greater than 1000 weight ppm of B, and the remaining portion consisting of Ni and inevitable impurities, and having a dual multi-phase microstructure comprising a primary L12 phase and an (L12+D022) eutectoid microstructure.
Claims13
A Ni3Al-based intermetallic compound comprising greater than 5 at % and not greater than 13 at % of Al, not less than 9.5 at % and less than 17.5 at % of V, not less than 0 at % and not greater than 3.5 at % of Ti, not less than 0 weight ppm and not greater than 1000 weight ppm of B, and the remaining portion consisting of Ni and inevitable impurities, and having a dual multi-phase structure comprising a primary L12 phase and an (L12+D022) eutectoid microstructure.
A method of producing a Ni3Al-based intermetallic compound comprising the steps of:
- performing a first heat treatment to heat-treat an alloy material comprising greater than 5 at % and not greater than 13 at % of Al, not less than 9.5 at % and less than 17.5 at % of V, not less than 0 at % and not greater than 3.5 at % of Ti, not less than 0 weight ppm and not greater than 1000 weight ppm of B, and the remaining portion consisting of Ni and inevitable impurities at a primary L12 phase/Al phase coexistence temperature at which a primary L12 phase and an Al phase coexist;
- and cooling the resulting alloy material to an L12 phase/D022 phase coexistence temperature at which an L12 phase and a D022 phase coexist, or performing a second heat treatment to heat-treat the resulting alloy material at the L12 phase/D022 phase coexistence temperature, whereby the Al phase is transformed into an (L12+D022) eutectoid microstructure to form a dual multi-phase microstructure.
Dependencies are inferred from the claim text.