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A kind of ni-co-al-cr-fe series single crystal high entropy superalloy and preparation method thereof
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A high-temperature alloy, high-entropy technology, applied in the field of high-entropy alloys, can solve the problems of high density and raw material prices, poor oxidation resistance, and inability to meet engineering application requirements.
Active Publication Date: 2020-10-20
UNIV OF SCI & TECH BEIJING
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For example, FeCoNiCrMn high-entropy alloys with excellent low-temperature fracture toughness have too low strength at room temperature and high temperature to meet the requirements of practical engineering applications; TaNbMoWV and TaNbMoW alloys with strengths much higher than nickel-based superalloys at high temperatures Density and raw material prices, poor oxidation resistance, also seriously hinder its high-temperature application; AlCoCrFeNi high-entropy alloys with high room temperature hardness show brittleness when stretched at room temperature, etc.
In addition, the current research on high-entropy alloys for engineering structures is mainly focused on their mechanical properties at room temperature, and there is little exploration of their application potential in high-temperature mechanical properties.
Therefore, in view of the common problems of insufficient high-temperature strengthening ability, high brittleness and poor oxidation resistance of existing high-entropy alloys, the mechanical properties of the alloy are further improved by strengthening methods such as solid solution strengthening and precipitation strengthening, and the composition optimization is used to improve the resistance of the alloy. Oxidation properties, etc., are the problems that need to be solved urgently in the application of high-entropy alloys in the field of high-temperature structural materials.
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[0030] In the following, the present invention will be specifically introduced from three aspects of composition design, alloy preparation and structure performance test for some alloys in the examples.
[0031] 1. Alloy design
[0032] Table 1 shows the alloy composition (atomic percentage) of some examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0033] Table 1 is the alloy embodiment composition (at%) of the present invention
[0034]
[0035] 2. Alloy Preparation
[0036] According to the ingredients shown in Alloy 1 in Table 1, weigh Ni, Co, Al, Cr, Fe, Ti, Ta, Mo, W, Re, C, B, Hf, RE raw materials, and weigh them according to weight percentage. put into a melting furnace for smelting, high-temperature refining for 15-30 minutes, and the refining temperature is 1550-1650 ° C, and cast into alloy ...
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Abstract
The invention discloses a high-entropy high-temperature alloy and a preparation method thereof, and belongs to the field of high-entropy alloys. The alloy comprises the following chemical components of, in percentage by atom, 35%-40% of Ni, 30%-35% of Co, 10%-13% of Al, 5%-10% of Cr, 5%-8.5% of Fe, 1%-2.5% of Ti, 1%-3% of Ta, 0.01%-1% of Mo, 0.01%-1% of W, 0-1% of Re, 0.02%-0.12 % of C, 0.002%-0.015% of B, 0.005%-0.12% of Hf, and 0.05%-0.15% of RE, wherein Al+Ti+Ta is greater than or equal to 14% and less than or equal to 16%, and RE is any one rare earth element of Ce, La and Y. The preparation process of the alloy comprises the following steps of weighing and matching alloy elements according to the molar ratio, putting the alloy elements into a smelting furnace for smelting, carrying out high-temperature refining and casting to obtain an alloy ingot, preparing a (001) oriented single crystal high-entropy high-temperature alloy bar by adopting a high-speed solidification Bridgeman method, and then performing solution treatment and secondary aging treatment on the alloy bar. The prepared alloy bar has good high-temperature strength and thermal corrosion resistance, and is a candidate material of a hot-end part of an aero-engine and an industrial gas turbine.
Description
technical field [0001] The invention belongs to the field of high-entropy alloys, and relates to a Ni-Co-Al-Cr-Fe single-crystal high-entropy superalloy and a preparation method thereof. Background technique [0002] High-entropy alloy refers to a new type of alloy system that includes 5 or more components, and the atomic ratio of each component is equal or nearly equal. Judging from the size of the mixing entropy, high-entropy alloys generally satisfy the mixing entropy ΔS mix >1.5R (R is the gas constant) requirement (mixing entropy is calculated according to the formula In the formula, i represents any element in the alloy, N is the sum of all elements in the alloy, c i is the mole fraction of element i). High-entropy alloys generally form solid solutions, which have structural lattice distortion effects, kinetic hysteresis diffusion effects, and performance cocktail effects. It is easy to obtain solid solution phases, nanostructures, and even amorphous structures ...
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