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A Ni-Co-Cr-Al-W-Ta-Mo based high-entropy high-temperature alloy and a preparation method thereof

A high-temperature alloy and high-entropy technology, applied in the field of high-entropy alloys, can solve the problem of low heat resistance of structural steel, and achieve the effects of excellent high-temperature oxidation resistance, excellent creep resistance and fatigue resistance, and excellent room temperature and high temperature strength.

Active Publication Date: 2018-03-02
UNIV OF SCI & TECH BEIJING
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

CN201410448734.6 invention discloses a kind of AlCoCuFeNiSi high entropy alloy and its preparation method, the purpose is to solve the problem of low heat resistance of existing structural steel

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  • A Ni-Co-Cr-Al-W-Ta-Mo based high-entropy high-temperature alloy and a preparation method thereof
  • A Ni-Co-Cr-Al-W-Ta-Mo based high-entropy high-temperature alloy and a preparation method thereof
  • A Ni-Co-Cr-Al-W-Ta-Mo based high-entropy high-temperature alloy and a preparation method thereof

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Embodiment Construction

[0034] The present invention will be specifically introduced from three aspects of composition design, alloy preparation and performance testing.

[0035] 1. Composition design

[0036] Design 10 kinds of Ni with different compositions a co b Cr c Al d W e Ta f Mo g Re x, where the composition range of each element is 31≤a≤40, 31≤b≤35, 10≤c≤18, d=10, 5≤e≤10, 0≤f≤1, 0≤g≤1, 0≤ x≤1, a+b+c+d+e+f+g+x=100. The specific compositions of the 10 alloys are shown in Table 1. The purpose of these 10 kinds of alloy composition design is mainly to study the influence of each element on the mechanical properties of the alloy. In addition to Ni, Co, Cr, Al, W, Ta, Mo, Re and Ru are selected as additional elements to further improve the high temperature strength. .

[0037] Table 1 Composition ratios (atomic percent) of 10 high-entropy superalloys

[0038] serial number

Ni

co

Cr

Al

W

Mo

Ta

Re

Ru

NC1

31.5

31.5

18

10

7

...

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Abstract

A Ni-Co-Cr-Al-W-Ta-Mo based high-entropy high-temperature alloy and a preparation method thereof are disclosed and belong to the field of high-entropy alloys. The chemical composition of the alloy isNiCoCr<c>Al<d>W<e>Ta<f>Mo<g>Rx, wherein R is one or two of Re and Ru. The method includes removing surface oxide skin of raw material metals by utilizing a mechanical-chemical combined process;cleaning the raw material metals by utilizing industrial ethanol and utilizing ultrasonic shaking; smelting the alloy by using a vacuum arc furnace; charging industrial argon when the vacuum degree is5*10<-2> Pa; after a master alloy is uniformly melted, injecting the alloy into a water cooling copper mould by utilizing a vacuum casting or suction casting device to obtain a high-entropy alloy rod; performing solution treatment at 1250 DEG C for 2-6 h; and then performing ageing heat treatment at 900 DEG C and 950 DEG C for 4-50 h. The disclosed alloy has excellent room-temperature and high-temperature strength, excellent resistance to high-temperature oxidation, and excellent creeping resistance, fatigue resistance and long-term tissue stability, is suitable for manufacturing hot end elements, such as blades and turbine discs, of aero-engines and gas turbines, and is used for engineering machines, special vehicles, coal, ore, railroads, and the like.

Description

technical field [0001] The invention belongs to the field of high-entropy alloys, and relates to a Ni-Co-Cr-Al-W-Ta-Mo high-entropy superalloy and a preparation method thereof. Background technique [0002] High-entropy alloy (or multi-principal alloy) is a new type of alloy material developed in recent years. The characteristic of this alloy is that it contains 5 or more components, and the content of each component is between 5% and 35%. Recently, the composition range of high-entropy alloys has been further expanded to include 4 or more components, and the content of each component is between 5% and 50%, such as the FeMnCoCr high-entropy alloy reported by Ziming Li et al. (9June 2016, Vol 534, Nature: 227), the element content range has been expanded to 50%. After solidification, high-entropy alloys did not form a large number of intermetallic compound phases, but formed a simple FCC, BCC or HCP solid solution-based organizational structure. The formation of solid solu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/02C22F1/18
CPCC22C1/02C22C1/023C22C19/056C22C19/07C22C30/00C22F1/18
Inventor 惠希东朱建陈金宾王璐王钦佳霍芊羽
Owner UNIV OF SCI & TECH BEIJING
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