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A high-performance low-density dual-phase high-entropy alloy and its preparation method

A high-entropy alloy, low-density technology, applied in the field of metal materials, can solve the problems of reduced alloy density, insufficient forming ability, and high density, and achieve the effects of good fluidity and casting forming ability, solving preparation problems, and excellent mechanical properties.

Active Publication Date: 2022-06-07
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to propose a high-performance low-density dual-phase high-entropy alloy, which has a coherent The structure is composed of disordered body-centered cubic phase and ordered body-centered cubic phase, which has ultra-high compressive strength and good plasticity. At the same time, the addition of Ti element can significantly reduce the density of the alloy, and the presence of Cr element makes the alloy have excellent Excellent corrosion resistance and oxidation resistance, that is, the overall performance of the alloy is excellent

Method used

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  • A high-performance low-density dual-phase high-entropy alloy and its preparation method
  • A high-performance low-density dual-phase high-entropy alloy and its preparation method
  • A high-performance low-density dual-phase high-entropy alloy and its preparation method

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Embodiment 1

[0031] The present embodiment discloses a high-performance low-density duplex high-entropy alloy, the chemical formula of the alloy is AlCrFeNiTi, abbreviated as alloy 1, wherein the proportion of each element is a molar atomic ratio.

[0032] The present embodiment of high performance low density Al a Crb Fe c Ni d Ti e The preparation method of the alloy, including the following steps:

[0033] (1) Cleaning: The Alloying Elements of Al, Cr, Fe, Ni and Ti are removed by mechanical grinding, and then placed in different beakers and added to alcohol, and the alloying elements after cleaning are removed and blown dry;

[0034] (2) Ingredients: take materials from the cleaned alloy raw materials, weigh the Corresponding Mass Al, Cr, Fe, Ni and Ti elements according to the molar atom ratio of the alloy and mix them;

[0035] (3) Drying: the mixed alloying elements are dried in the drying box;

[0036] (4) Alloy smelting: the mixed material is placed in the arc melting furnace, the fur...

Embodiment 2

[0039] The present embodiment discloses a high-performance low-density duplex high-entropy alloy, the chemical formula of the alloy is Al a Cr b Fe c Ni d Ti e , abbreviated as alloy 2, where the atomic ratio of each element is a:b:c:d:e.

[0040] The preparation method of the high entropy alloy is the same as the preparation method of Example 1, the difference is that the corresponding mass of Al, Cr, Fe, Ni and Ti elements are weighed according to the atomic ratio of the alloy during the batching process and mixed.

[0041]Microscopic tissue observation of Examples 1 and 2 by scanning electron microscopy, analysis of the crystal structure of Example 2 by X-ray diffraction pattern, Figure 1 For examples 1 and 2 of the microstructure picture, Figure 2 For the XRD spectrum of Example 2, according to the detection results, the alloy is composed of a two-phase structure of a layer of sheets, the two phases are the ordered body centripetal cubic phase and the disordered centripetal cu...

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Abstract

The invention provides a high-performance low-density dual-phase high-entropy alloy and a preparation method thereof. The general formula of the high-performance low-density dual-phase high-entropy alloy is Al a Cr b Fe c Ni d Ti e , where a, b, c, d and e respectively represent the atomic ratios of the corresponding elements, the values ​​of a, b, c and d are not less than 5 and not greater than 35, and the value of e is not greater than 8. The invention also discloses a method for preparing the high-performance low-density dual-phase high-entropy alloy, which includes the following steps: placing the mixed material according to the general formula in an electric arc melting furnace for melting, and using an electric arc in an argon protective atmosphere to The alloy is melted and smelted repeatedly. The alloy of the present invention has a disordered body-centered cubic phase and an ordered body-centered cubic phase in a coherent structure, and has ultra-high compressive strength and good plasticity. At the same time, the addition of Ti element significantly reduces the density of the alloy, and Cr The existence of the element makes the alloy have excellent corrosion resistance and oxidation resistance, and the overall performance of the alloy is excellent.

Description

Technical field [0001] The present invention relates to metal material technology, in particular to a high-performance low-density duplex high-entropy alloy and a preparation method thereof. Background [0002] High-entropy alloys are new metal materials composed of a variety of main elements, which have the characteristics of severe lattice distortion, hysteretic diffusion and high mixed entropy. This type of alloy has excellent performance than traditional alloys in terms of mechanical properties, corrosion resistance and irradiance resistance, so this type of alloy has a wide range of application prospects and potential in aerospace and extremely complex environmental conditions. Among the high-entropy alloys studied so far, alloys with single-phase face-centered cubic structures have higher plasticity, but the strength is generally lower; Alloys with a body-centered cubic structure have high strength, but poor plasticity is difficult to meet the requirements of engineering ap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C1/02
CPCC22C30/00C22C1/02Y02P10/25
Inventor 王同敏魏成宾卢一平李廷举曹志强接金川康慧君张宇博陈宗宁郭恩宇
Owner DALIAN UNIV OF TECH
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