A kind of light refractory high temperature resistant eutectic high entropy alloy and preparation method thereof

Abstract

The present invention disclosed a kind of light, difficult to melt high -temperature common crystal high entropy alloys and its preparation methods.Among them, the chemical component expression of the light quality, difficulty melting high -temperature co -crystal high entropy alloys is V a NB b M c SI d , M is a TI, ZR, TA, MO, CR, and one or more elements in AL. The A, B, C, and D in chemical expression represent the Moore percentage of the corresponding elements, of which 0 <A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A.≤45, 0 <b≤35, 0 ≤C ≤ 35, 10 ≤D ≤20, A+B+C+D = 100.The alloy is from the VNBM solid -soluble phase of the body heart cube structure (VNBM) 5 SI 3 The orderly compound is composed of a layer -like co -crystal tissue, which has a density and high melting point that is far below nickel -based, cobalt -based high -temperature alloys, and has a certain room temperature plasticity, high high temperature intensity, and excellent casting performance. It can meet satisfaction.The needs of advanced high temperature structure materials.

Description

technical field [0001] The invention belongs to the field of refractory eutectic high-entropy alloys and high-temperature metal structural materials, and provides a VNbMSi light-weight refractory eutectic high-entropy alloy with ultrahigh high-temperature strength and a preparation method thereof. The alloy is used in the field of high-temperature structural materials with broadly application foreground. Background technique [0002] High-temperature metal structural materials are key materials for various hot-end parts of engines used in aircraft and spacecraft. The development of advanced aerospace vehicles not only requires high-temperature metal structural materials to have higher temperature-bearing capacity, better comprehensive performance (strength, toughness, creep, fatigue resistance, etc.), but also have a lower density. The density of traditional nickel-based and cobalt-based superalloys is 8.5g / cm 3 Above, the use temperature is within 1100°C, which is close t...

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Problems solved by technology

[0008] Through the above search, it is found that the design of eutectic high-entropy alloys currently reported focuses on introducing intermetallic compounds into the FCC solid solution phase, but limited by the characteristics of insufficient strength of the FCC solid solution phase and low melting point, such eutectic high-entropy alloys are difficult to Withstand the test of high temperature conditions

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