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High toughness and high entropy alloy with gradient grain structure and preparation method thereof

A high-entropy alloy and grain structure technology, which is applied in the fields of high-strength and toughness high-entropy alloys and rolling heat treatment technology, can solve the problems of poor matching of strength and toughness of high-entropy alloys, and achieve high-strength plastic matching, good plasticity, and simple preparation process. Effect

Active Publication Date: 2018-09-11
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of poor strength and toughness matching of high-entropy alloys in the prior art, the present invention provides a high-strength and toughness high-entropy alloy with a gradient grain structure and a preparation method thereof

Method used

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  • High toughness and high entropy alloy with gradient grain structure and preparation method thereof
  • High toughness and high entropy alloy with gradient grain structure and preparation method thereof
  • High toughness and high entropy alloy with gradient grain structure and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0034] Ultrasonic cleaning of pure metal with alcohol for 5 minutes to remove dust and oil stains on the surface, and then dry it with a hair dryer;

[0035] According to the stated atomic percentages, pure Co, pure Cr, pure Fe and pure Ni (purity ≥ 99.5%) are stacked in the melting furnace from bottom to top in the order of melting point from low to high, and the vacuum degree is equal to 10 -3 MPa, then fill it with argon, conduct arc melting at a high temperature of 1200°C under magnetic field stirring for 25 minutes, and then cool naturally to obtain alloy ingots;

[0036] Repeat the above "arc smelting-natural cooling" process (that is, the same temperature and time) 4 times to obtain a relatively uniform cast sample;

[0037] Place the obtained as-cast sample in a resistance furnace, heat it at 1200°C for 4 hours for solid solution treatment, and take it out for water quenching;

[0038] Cut the obtained solution treated sample into 3mm thin slices by wire cutting techn...

Embodiment 2

[0041] Ultrasonic cleaning of pure metal with alcohol for 5 minutes to remove dust and oil stains on the surface, and then dry it with a hair dryer;

[0042] According to the stated atomic percentages, pure Co, pure Cr, pure Fe and pure Ni (purity ≥ 99.5%) are stacked in the melting furnace from bottom to top in the order of melting point from low to high, and the vacuum degree is equal to 10 -3 MPa, then fill it with argon, conduct arc melting at a high temperature of 1200°C under magnetic field stirring for 25 minutes, and then cool naturally to obtain alloy ingots;

[0043] Repeat the above "arc smelting-natural cooling" process (that is, the same temperature and time) 5 times to obtain a relatively uniform cast sample;

[0044] Place the obtained as-cast sample in a resistance furnace, heat it at 1200°C for 4 hours for solid solution treatment, and take it out for water quenching;

[0045] Cut the obtained solution treated sample into 3mm thin slices by wire cutting techn...

Embodiment 3

[0048] Ultrasonic cleaning of pure metal with alcohol for 5 minutes to remove dust and oil stains on the surface, and then dry it with a hair dryer;

[0049] According to the stated atomic percentages, pure Co, pure Cr, pure Fe and pure Ni (purity ≥ 99.5%) are stacked in the melting furnace from bottom to top in the order of melting point from low to high, and the vacuum degree is equal to 10 -3 MPa, then fill it with argon, conduct arc melting at a high temperature of 1200°C under magnetic field stirring for 25 minutes, and then cool naturally to obtain alloy ingots;

[0050] Repeat the above "arc smelting-natural cooling" process (that is, the same temperature and time) 4 times to obtain a relatively uniform cast sample;

[0051] Place the obtained as-cast sample in a resistance furnace, heat it at 1200°C for 4 hours for solid solution treatment, and take it out for water quenching;

[0052] Cut the obtained solution treated sample into 3mm thin slices by wire cutting techn...

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Abstract

The invention provides a high toughness and high entropy alloy with a gradient grain structure and a preparation method thereof. The alloy is a novel CoCrFeNi high entropy alloy. The invention discloses a high toughness and high entropy alloy with a gradient grain structure and a preparation method thereof. The high entropy alloy is a CoCrFeNi alloy, has a single phase face-centered cubic structure, and is composed of following components in atomic percentage by weight: 38 to 42% of Co, 24 to 26% of Cr, 8 to 12% of Fe, and 24 to 26% of Ni, wherein the total atomic percentage by weight is 100%.By increasing the Co content of the alloy, the rolling resistant force during the preparation process is reduced, then low temperature annealing is performed to obtain the high entropy alloy with a gradient grain structure, and the strength of the high entropy alloy is improved on the basis that the plasticity is not influenced.

Description

technical field [0001] The invention relates to a high-strength toughness high-entropy alloy with a gradient grain structure and a rolling heat treatment process, and belongs to the technical field of high-entropy alloy materials and their strengthening and modification. Background technique [0002] Traditional alloys are usually based on one or two main elements, and the microstructure of the alloy is adjusted by adding one or several small amounts of other elements to achieve certain specific performance requirements. With the continuous development and progress of society, people also put forward higher and more comprehensive requirements for metal materials. In 2004, Taiwanese scholars took the lead in proposing a new alloy design concept "high-entropy alloy", which is an alloy system composed of a variety of main constituent elements, breaking through the limitation of a single principal element in traditional alloys. Because the high-entropy effect in high-entropy al...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/02C22F1/00
CPCC22C1/02C22C30/00C22F1/00
Inventor 方伟常若斌殷福星张昕冀璞光
Owner HEBEI UNIV OF TECH
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