Rhenium-containing Ni3Al-based single crystal alloy

Abstract

The invention provides a rhenium-containing Ni3Al-based single crystal alloy, which comprises the following components in percentage by weight: 7 to 8 percent of Al, 8 to 13 percent of Mo, 0.0005 to 3 percent of Re and the balance of Ni; and the rhenium-containing Ni3Al-based single crystal alloy also can contain more than one of 0.05 to 0.5 percent of Dy, 0.1 to 1 percent of Y and 0.05 to 0.5 percent of Hf. In the rhenium-containing Ni3Al-based single crystal alloy, the rhenium element is added into a Ni3Al-based single crystal alloy, so that the rhenium element is subjected to solid solution in a gamma' phase and a gamma phase and forms a rhenium atom cluster in short range order in the gamma phase. At high temperature, the diffusion coefficient of rhenium in the gamma phase and the gamma' phase is small, the diffusion coefficients of other alloy elements such as Al, Mo and the like in the gamma phase and the gamma' phase can be reduced, and the high temperature stability of the alloy is improved.

Description

technical field [0001] The invention belongs to the technical field of alloys, in particular to a rhenium-containing Ni 3 Al-based single crystal alloy. Background technique [0002] At present, in the industrial fields of power, petrochemical, transportation, especially aviation and aerospace, the engine is required to have a higher thrust-to-weight ratio and work efficiency, which requires the engine to have a higher operating temperature. At present, nickel-based single crystal superalloys are usually used, but high melting point metals such as W, Ta, Re, and Ru are added to nickel-based single crystal superalloys to make their density and cost higher. At the same time, due to the current use of Ni-based superalloys The temperature has reached 85% to 90% of its melting point, which is close to its use limit. Therefore, the development space of Ni-based superalloys is limited, and it is difficult to meet the requirements of high-temperature structural materials for future...

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Problems solved by technology

[0004] in Ni 3 In the Al intermetallic compound-based alloy, the γ′ phase and the γ phase can be simultaneously strengthened by adding Mo element, reference 1: Mackay R.A., Ebert L.J.in Proc.5th int symp on Superallous[C].Now York: AIME, 1984: 135-144, Reference 2: Mackay R.A., Nathal M.V. in Micon 86: Optimization of Processing, properties, and Servive Performance Through Microstructural Control [C]. Philadelphia: ASTM, 1988: 202-210 and Reference 3: Giamei A.F., Pearson D.D., Anton D.L. High Temperature Ordered Intermetallic Alloys [C]. Pittsburgh: MRS, 1985: 293-308 studies have shown that when the Mo content is 14wt%, better high temperature creep performance is obtained, but too much Mo will lead to alloy Decreased antioxidant capacity

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