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Ultrafine-grained Al-bearing multiple-principal-element high-entropy alloy and preparation method thereof

A high-entropy alloy and multi-principal element technology, applied in the field of metal materials, can solve problems such as insufficient high-temperature oxidation resistance, and achieve the effects of improving high-temperature creep resistance, improving strength, and improving theoretical toughness

Active Publication Date: 2019-01-04
BAISE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] AlCoCrFeNi high-entropy alloy is a typical high-entropy alloy with BCC structure, which has excellent comprehensive mechanical properties, but its strength, plasticity and low high-temperature oxidation resistance at high temperatures limit it to become a new generation of high-temperature structural materials.

Method used

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  • Ultrafine-grained Al-bearing multiple-principal-element high-entropy alloy and preparation method thereof
  • Ultrafine-grained Al-bearing multiple-principal-element high-entropy alloy and preparation method thereof
  • Ultrafine-grained Al-bearing multiple-principal-element high-entropy alloy and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0025] Ultrafine-grained Al-containing multi-principal element high-entropy alloy, composed of Al, Co, Cr, Fe, Ni, Ti and Nb, recorded as Al according to atomic ratio 20-x co 20 Cr 20 Fe 20 Ni 20 (Ti y Nb 1-y ) x , wherein x=10; y=0.5; said Al, Co, Cr, Fe, Ni, Ti and Nb are solid pure raw materials with a purity not lower than 99.5wt%.

[0026] The preparation method of the above-mentioned ultrafine-grained Al-containing multi-principal high-entropy alloy comprises the following steps:

[0027] Step (1): Al, Co, Cr, Fe, Ni, Ti and Nb elemental small particles are compounded according to the composition ratio;

[0028] Step (2): Put the prepared materials in step (1) in the melting furnace and close the furnace door (the low melting point is placed in the core of the raw material, and the high melting point is placed around the low melting point raw material to reduce the burning rate of elements), pump Vacuum to vacuum degree 3*10 -3 Pa, then filled with argon, this s...

Embodiment 2

[0033] Ultrafine-grained Al-containing multi-principal element high-entropy alloy, composed of Al, Co, Cr, Fe, Ni, Ti and Nb, recorded as Al according to atomic ratio 20-x co 20 Cr 20 Fe 20 Ni 20 (Ti y Nb 1-y ) x , wherein x=6; y=0.8; said Al, Co, Cr, Fe, Ni, Ti and Nb are solid pure raw materials with a purity not lower than 99.5wt%.

[0034] The preparation method of the above-mentioned ultrafine-grained Al-containing multi-principal high-entropy alloy comprises the following steps:

[0035] Step (1): Al, Co, Cr, Fe, Ni, Ti and Nb elemental small particles are compounded according to the composition ratio;

[0036] Step (2): Put the prepared materials in step (1) in the melting furnace, place the low melting point material in the core of the raw material, and place the high melting point material around the low melting point material to reduce the burning loss rate of elements, and close the furnace door , evacuated to a vacuum of 1×10 -3 Pa, then filled with argon,...

Embodiment 3

[0041] Ultrafine-grained Al-containing multi-principal element high-entropy alloy, composed of Al, Co, Cr, Fe, Ni, Ti and Nb, recorded as Al according to atomic ratio 20-x co 20 Cr 20 Fe 20 Ni 20 (Ti y Nb 1-y ) x , wherein x=15; y=0.2; said Al, Co, Cr, Fe, Ni, Ti and Nb are solid pure raw materials with a purity not lower than 99.5wt%.

[0042] The preparation method of the above-mentioned ultrafine-grained Al-containing multi-principal high-entropy alloy comprises the following steps:

[0043] Step (1): Al, Co, Cr, Fe, Ni, Ti and Nb elemental small particles are compounded according to the composition ratio;

[0044] Step (2): Put the prepared materials in step (1) in the melting furnace, place the low melting point material in the core of the raw material, and place the high melting point material around the low melting point material to reduce the burning loss rate of elements, and close the furnace door , evacuated to a vacuum degree of 5×10 -3 Pa, then filled wit...

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Abstract

The invention discloses ultrafine-grained Al-bearing multiple-principal-element high-entropy alloy and a preparation method thereof. The ultrafine-grained Al-bearing multiple-principal-element high-entropy alloy is composed of Al, Co, Cr, Fe, Ni, Ti and Nb, marked in an atomic ratio as Al20-xCo20Cr20Fe20Ni20(TiyNb1-y)x, wherein 0<x<20, and 0<y<1. The ultrafine-grained Al-bearing multiple-principal-element high-entropy alloy is prepared by the combination of vacuum arc melting and equal channel angular extrusion; firstly, an alloy rod is made by vacuum arc melting; a super-large block of ultrafine-grained high-entropy alloy is prepared via equal channel angular extrusion; secondly, subsequent annealing is performed to adjust strength and plasticity of the alloy. By adding certain Ti and Nbto replace Al, high-temperature creep resistance of the alloy herein is improved; BCC (body center cubic) solid solution is formed, so that antioxidant property is improved; equal channel angular extrusion and annealing help improve strength, plasticity and antioxidant property.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to an ultrafine-grain Al-containing multi-principal element high-entropy alloy and a preparation method thereof. Background technique [0002] Traditional alloys are based on one or two elements, and some specific performance requirements can be achieved by adding a small amount of other elements. Professor Ye Junwei from Taiwan, China, proposed a brand-new alloy system, that is, multi-principal high-entropy alloys: "Multi-principal high-entropy alloys are mainly composed of multiple elements, with more than five main elements. The atomic percentage of each main element is between Between 5% and 35%, none of the components will exceed 50% in atomic percentage and become the only main element." The alloy has a high entropy value in thermodynamics, and has atomic slow diffusion effect in kinetics, The crystal structure has a lattice distortion effect. In addition,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/02C22F1/16
CPCC22C1/02C22C30/00C22F1/002C22F1/16
Inventor 陈林卿陪林杨途才
Owner BAISE UNIV
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