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Light refractory high-temperature-resistant eutectic high-entropy alloy and preparation method thereof

A high-entropy alloy and high-temperature-resistant technology, applied in the field of VNbMSi light-weight refractory eutectic high-entropy alloy and its preparation, can solve the test that eutectic high-entropy alloy cannot withstand high temperature conditions, low melting point, FCC solid solution phase strength Insufficient and other problems, to achieve the effect of enhancing the solid solution strengthening effect, excellent high temperature performance, and excellent microstructure stability

Active Publication Date: 2021-06-18
SHANGHAI JIAO TONG UNIV
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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

Method used

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  • Light refractory high-temperature-resistant eutectic high-entropy alloy and preparation method thereof
  • Light refractory high-temperature-resistant eutectic high-entropy alloy and preparation method thereof
  • Light refractory high-temperature-resistant eutectic high-entropy alloy and preparation method thereof

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Embodiment 1-3

[0057] Embodiment 1-3: The preparation process of light-weight refractory high-temperature resistant eutectic high-entropy alloy is as follows:

[0058] 1) Raw material preparation: use raw materials V, Nb, Ti, Cr, Mo and Si with a purity of more than 99.95% for smelting metal raw materials, use sandpaper to remove oxide scales on the raw materials, and then use a balance to accurately weigh them for smelting. Among them, The ratio of each alloy composition is shown in Table 1.

[0059] Table 1 is the nominal composition (at%) of the alloys of the examples.

[0060]

[0061]

[0062] 2) Smelting of high-entropy alloys: Take weighed raw materials and put them into a vacuum electric arc furnace. According to the smelting requirements, elements with high melting points are placed on the upper layer to cover elements with lower melting points. When smelting, first use a small electric arc to burn the upper layer of high melting point elements red, and then adjust the curren...

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Abstract

The invention discloses a light refractory high-temperature-resistant eutectic high-entropy alloy and a preparation method thereof. The chemical component expression of the light refractory high-temperature-resistant eutectic high-entropy alloy is VaNbbMcSid, wherein M is one or more elements of Ti, Zr, Ta, Mo, Cr and Al, and a, b, c and d in the chemical expression respectively represent the molar percentages of the corresponding elements and meet the following relations: 0<a<= 45, 0<b<=35, 0<c<=35, 10<=d<=20, and a+b+c+d=100. The alloy is of a lamellar eutectic structure composed of a VNbM solid solution phase of a body-centered cubic structure and a (VNbM)5Si3 ordered compound phase of a tetragonal or hexagonal structure, has density far lower than that of a nickel-based and cobalt-based high-temperature alloy and an ultrahigh melting point, and has certain room-temperature plasticity, high high-temperature strength and excellent casting performance, thereby meeting the requirements for advanced high-temperature structural 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/02B22D18/06
CPCC22C30/00C22C1/02B22D18/06
Inventor 疏达吴明旭王舒滨祝国梁汪东红孙宝德
Owner SHANGHAI JIAO TONG UNIV
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