Stable gamma' phase intensified Co-Ni-V-Al-base high temperature alloy

Abstract

The invention discloses a stable gamma' phase intensified Co-Ni-V-Al-base high temperature alloy. Co, Ni, V and Al are necessary elements, and chemical components of the stable gamma' phase intensified Co-Ni-V-Al-base high temperature alloy include, by atomic percent, 30%-40% of Ni, 1%-10% of V, 8%-14% of Al, 0%-6% of Ta, 0%-4% of Ti and the balance Co. The stable gamma' phase intensified Co-Ni-V-Al-base high temperature alloy is composed of a basal body gamma phase and a gamma'-Co3(V, Al) phase provided with an L12 crystal structure, and gamma separated phases are evenly distributed in the gamma basal body phase in a spherical shape or a cubic shape. Due to the fact that the alloy does not contain W elements or other high-ratio heavy elements, the density of the alloy is remarkably lowerthan that of a Co-Al-W-base alloy. In addition, when the alloy is preserved at the temperature of 900 DEG C for 4,000 hours, gamma / gamma' two phase tissue can still be acquired, and it shows that theintensifying phase in the alloy is the thermodynamic stable phase.

Description

technical field [0001] The invention belongs to the technical field of new materials, and relates to a Co-Ni-V-Al-based superalloy with a γ / γ′ two-phase structure and γ′ as a thermodynamic stable phase. Background technique [0002] Superalloys are key materials in the aerospace field, and the high-temperature materials widely used in this field are Ni-based superalloys. In aero-engines, high-temperature alloys account for about 50% of the total engine materials. Therefore, in a sense, the development of the aviation industry depends on the development of new high-temperature alloy materials. However, the current service temperature of nickel-based superalloys is close to its melting point, and the improvement of its temperature bearing capacity is extremely limited. The microstructure of nickel-based superalloys is characterized by uniform distribution of ordered L1 in the face-centered cubic structure of the γ matrix phase 2 γ′-Ni 3 Al precipitated phase. In 2006, Ishi...

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Problems solved by technology

[0008] (1) Kobayashi [2-4] The research results of et al. showed that in the Co-Al-W ternary alloy, the γ′-Co 3 The (Al,W) precipitated phase is a metastable phase. After a Co-Al-W alloy with a γ / γ′ two-phase structure is kept at 900°C for a long time, the γ′-Co 3 (Al,W) precipitates will decompose to form CoAl and Co 3 W phase, the high temperature structure stability of the alloy is poor

[0009] (2) Bocchini [5-6] The research results of et al. showed that the higher mass ratio of W element in the Co-Al-W base alloy significantly increased the density of the alloy, which was not conducive to its application in the aerospace field.

Although researchers try to reduce the density of Co-Al-W-based alloys by adding alloying elements, their densities are still as high as 9.2-10.1 g.cm -3

[0010] At present, the relevant research reports on the new system of Co-based superalloys without W element are very limited.

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