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Precipitation strengthening type high-entropy alloy and preparation process thereof

A high-entropy alloy and precipitation strengthening technology is applied in the field of precipitation-strengthened high-entropy alloy and its preparation technology, which can solve the problems of low strength of high-entropy alloy and achieve the effect of simple structure and high engineering application value.

Active Publication Date: 2020-05-12
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem that the current FCC structure high-entropy alloy generally has low strength, the purpose of the present invention is to provide a precipitation-strengthened high-entropy alloy and its preparation process. It is prepared by treatment and aging treatment, and nano-sized Ni is precipitated on the FeCoNiCr high-entropy alloy matrix. 3 The Al-type intermetallic compound strengthening phase significantly increases its yield strength and tensile strength at room temperature without reducing plasticity or to a lesser extent

Method used

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  • Precipitation strengthening type high-entropy alloy and preparation process thereof
  • Precipitation strengthening type high-entropy alloy and preparation process thereof
  • Precipitation strengthening type high-entropy alloy and preparation process thereof

Examples

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Embodiment 1

[0035] In this example, a precipitation-strengthened high-entropy alloy is prepared by vacuum induction melting and heat treatment technology, and the preparation process is as follows:

[0036] (1) Ingredients: Use sandpaper and a grinder to remove impurities such as scales on the surface of Fe, Co, Ni, Cr, Al, Ti and Nb metal blocks, and then use acetone and absolute ethanol to perform ultrasonic cleaning in sequence to obtain metal elements. Accurately weigh Fe, Co, Ni, Cr, Al, Ti and Nb metal elements according to the metering ratio in the chemical formula, where a=23.75, b=23.75, c=23.75, d=23.75, e=3, m=1 , n=1, the total mass of raw materials is 2.5kg.

[0037](2) Smelting: Heat the clean Fe, Co, Ni, Cr metal elements in a vacuum induction melting furnace to 1700°C and keep them warm for 10 minutes, then add Ti and Nb elemental substances and keep them warm for 5 minutes, and finally add Al and keep them warm for 5 minutes. Then the molten steel is poured into a steel ...

Embodiment 2

[0044] In this example, a precipitation-strengthened high-entropy alloy is prepared by vacuum induction melting and heat treatment technology, and the preparation process is as follows:

[0045] (1) Ingredients: Use sandpaper and a grinder to remove impurities such as scales on the surface of Fe, Co, Ni, Cr, Al, Ti and Nb metal blocks, and then use acetone and absolute ethanol to perform ultrasonic cleaning in sequence to obtain metal elements. Accurately weigh Fe, Co, Ni, Cr, Al, Ti and Nb metal elements according to the metering ratio in the chemical formula, where a=23.75, b=23.75, c=23.75, d=23.75, e=3, m=1 , n=1, the total mass of raw materials is 2.5kg;

[0046] (2) Smelting: Heat the clean Fe, Co, Ni, Cr metal elements in a vacuum induction melting furnace to 1700°C and keep them warm for 10 minutes, then add Ti and Nb elemental substances and keep them warm for 5 minutes, and finally add Al and keep them warm for 5 minutes. Then the molten steel is poured into a steel...

Embodiment 3

[0053] In this example, a precipitation-strengthened high-entropy alloy is prepared by vacuum induction melting and heat treatment technology, and the preparation process is as follows:

[0054] (1) Ingredients: Use sandpaper and a grinder to remove impurities such as scales on the surface of Fe, Co, Ni, Cr, Al, Ti and Nb metal blocks, and then use acetone and absolute ethanol to perform ultrasonic cleaning in sequence to obtain metal elements. Accurately weigh Fe, Co, Ni, Cr, Al, Ti and Nb metal elements according to the metering ratio in the chemical formula, where a=23.75, b=23.75, c=23.75, d=23.75, e=3, m=1 , n=1, the total mass of raw materials is 2.5kg.

[0055] (2) Smelting: Heat the clean Fe, Co, Ni, Cr metal elements in a vacuum induction melting furnace to 1700°C and keep them warm for 10 minutes, then add Ti and Nb elemental substances and keep them warm for 5 minutes, and finally add Al and keep them warm for 5 minutes. Then the molten steel is poured into a steel...

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Abstract

The invention discloses a precipitation strengthening type high-entropy alloy and a preparation process thereof. The precipitation strengthening type high-entropy alloy is prepared by taking Fe, Co, Ni, Cr, Al, Ti and Nb metal blocks as raw materials through vacuum induction melting, rolling and heat treatment processes. The obtained alloy has the characteristic structure that a spherical Ni3Al type intermetallic compound is precipitated on a face-centered cubic solid solution matrix in a coherent mode, a FeCoNiCr high-entropy alloy matrix is strengthened by using nanoscale (Ni, Co)3(Al, Ti, Nb), and the Ni3Al type intermetallic compound is precipitated on the matrix in the coherent manner, so that the alloy is strengthened; and the obtained precipitation strengthening type high-entropy alloy has the characteristics of being high in strength and plasticity, adjustable in microstructure and the like.

Description

technical field [0001] The invention relates to a precipitation-strengthened high-entropy alloy and a preparation process thereof, belonging to the field of high-entropy alloys. Background technique [0002] High-performance materials with high strength and high plasticity are necessary to improve engineering reliability and energy efficiency, as well as reduce CO2 emissions during material production. However, due to the mutually exclusive relationship between strength and plasticity, it is very challenging to develop advanced materials with greatly improved strength and plasticity. Single-phase alloys usually have good ductility but relatively low strength. The introduction of nanotwins and transformation-induced martensite enhances the strength of the alloy, however, the yield strength obtained from these methods is still limited, restricting its application range. [0003] The high-entropy alloys developed in the past ten years use a variety of elements as the main ele...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/02C22F1/00
CPCC22C30/00C22C1/02C22F1/00
Inventor 钟志宏汤蔚霞刘成友陈畅
Owner HEFEI UNIV OF TECH