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Precipitation-enhanced high-entropy alloy without sigma-phase precipitation tendency and preparation method of precipitation-enhanced high-entropy alloy

A technology of precipitation strengthening and high-entropy alloy, applied in the field of high-entropy alloy preparation, can solve problems such as the decline of comprehensive mechanical properties, and achieve the effect of eliminating the tendency of precipitation and improving the application prospect.

Active Publication Date: 2020-10-27
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] A large number of studies have shown that during the medium-temperature aging process of CrMnFeCoNi high-entropy alloys, Cr elements tend to induce the precipitation of brittle sigma (σ) phases and (or) other compounds, resulting in a decline in comprehensive mechanical properties.

Method used

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  • Precipitation-enhanced high-entropy alloy without sigma-phase precipitation tendency and preparation method of precipitation-enhanced high-entropy alloy
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  • Precipitation-enhanced high-entropy alloy without sigma-phase precipitation tendency and preparation method of precipitation-enhanced high-entropy alloy

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Effect test

Embodiment 1

[0030] The molecular formula of the high-entropy alloy prepared in this example is MnFeNiCu. Preferably, the purity of the constituent elements is above 99.9%, so as to reduce the introduction of impurities as much as possible.

[0031] The Fe, Ni, and Cu materials used are weighed with a precision balance, and the weighed raw materials are put into absolute ethanol for ultrasonic cleaning and fully dried to remove other impurities attached to the surface. Due to the easy-to-oxidize property of the Mn element itself, before weighing the Mn raw material, wash it twice with 10vol.% nitric acid alcohol solution, then wash it once with absolute ethanol in an ultrasonic cleaner, and then weigh it with a precision balance after drying. And put it into the smelting equipment for smelting as soon as possible.

[0032] Put the pretreated alloy raw materials into the magnesia crucible of the smelting furnace one by one, and put the Mn at the bottom of the crucible to minimize the evapo...

Embodiment 2

[0035] The molecular formula of the high-entropy alloy prepared in this example is MnFeNiCu. Preferably, the purity of the constituent elements is above 99.9%, so as to reduce the introduction of impurities as much as possible.

[0036] The Fe, Ni, and Cu materials used are weighed with a precision balance, and the weighed raw materials are put into absolute ethanol for ultrasonic cleaning and fully dried to remove other impurities attached to the surface. Due to the easy-to-oxidize property of the Mn element itself, before weighing the Mn raw material, wash it twice with 10vol.% nitric acid alcohol solution, then wash it once with absolute ethanol in an ultrasonic cleaner, and then weigh it with a precision balance after drying. And put it into the smelting equipment for smelting as soon as possible.

[0037] Put the pretreated alloy raw materials into the magnesia crucible of the smelting furnace one by one, and put the Mn at the bottom of the crucible to minimize the evapo...

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Abstract

The invention discloses a precipitation-enhanced high-entropy alloy without a sigma-phase precipitation tendency and a preparation method of the precipitation-enhanced high-entropy alloy, and belongsto the field of high-entropy alloys. The precipitation-enhanced high-entropy alloy is composed of such four elements as Fe, Ni, Mn and Cu at a molar ratio. According to the preferred preparation method of the precipitation-enhanced high-entropy alloy, the prepared raw materials are smelted in an electric-arc furnace under the protection of vacuum argon gas at first, and then the precipitation-enhanced high-entropy alloy without the sigma-phase precipitation tendency is obtained through the steps of drop casting, homogenization annealing, cold rolling and aging. The precipitation-enhanced high-entropy alloy without the sigma-phase precipitation tendency has the beneficial effects that the optimal values of the room temperature yield strength and the tensile strength can reach 825 MPa and 933 MPa correspondingly; the elongation can be higher than 15%; and the mechanical performance indexes can be adjusted by utilizing aging parameters. Furthermore, the precipitation-enhanced high-entropyalloy without the sigma-phase precipitation tendency has the excellent comprehensive mechanical performance at room temperature.

Description

technical field [0001] The invention belongs to the field of high-entropy alloy preparation, and more specifically relates to a precipitation-strengthened high-entropy alloy without σ phase precipitation tendency and a preparation method thereof. Background technique [0002] Since High-entropy-alloys (HEAs) were proposed, people's understanding of traditional alloys has been subverted. Due to the cocktail effect of high-entropy alloys, people may need to adjust the alloy components to achieve the required properties, which greatly broadens the thinking of researchers in designing new materials. High-entropy alloys generally refer to alloy systems composed of five or more alloy elements in (nearly) equal atomic ratios. Based on this, a variety of new alloy systems with unique properties have been proposed. Among them, the alloy system with face-centered cubic structure (FCC) has excellent toughness / plasticity and is considered to have great application potential. However, ...

Claims

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Application Information

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IPC IPC(8): C22C30/02C22C1/02C22F1/00
CPCC22C1/02C22C30/02C22F1/00C22F1/002
Inventor 刘鑫旺高腾飞刘鹏涂泽立蒋文明樊自田
Owner HUAZHONG UNIV OF SCI & TECH
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