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Nb microalloyed Ni-Co-Fe-Cr-Al high-entropy alloy

A high-entropy alloy and micro-alloying technology, which is applied in the field of Nb micro-alloyed Ni-Co-Fe-Cr-Al high-entropy alloys, can solve the problems of mismatching strength and toughness of multi-principal alloys, and achieve small deformation resistance, The effect of high yield strength and good deformation ability

Active Publication Date: 2018-02-27
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that the strength and toughness of existing Ni-Co-Fe-Cr-Al multi-principal alloys do not match, the object of the present invention is to provide a kind of Nb microalloyed Ni-Co-Fe-Cr-Al high entropy alloy, by adding The content of trace Nb elements and regulatory components promotes the L1 2 The formation of phases avoids the appearance of unfavorable phases such as B2, so that the high-entropy alloy has both good toughness and high yield strength, and meets the requirements of modern industry for the mechanical properties of materials.

Method used

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Examples

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Embodiment 1

[0045] The preparation of a kind of Nb microalloying Ni-Co-Fe-Cr-Al high entropy alloy, concrete steps are as follows,

[0046] (1) Ingredients: Use sandpaper and a grinder to remove the oxide skins on the surface of the metal elements Al, Ni, Co, Cr, Fe and Nb, and then use absolute ethanol to perform ultrasonic cleaning to obtain clean metal elements; according to Ni:Co: The atomic percentage of Fe:Cr:Al:Nb=36.81:20.45:20.45:14.31:7.98:0, accurately weighed out the mixed raw material whose total mass is 80g;

[0047] (2) Alloying and smelting: Put the mixed raw materials into the water-cooled copper crucible in the high vacuum non-consumable arc melting furnace, and then vacuumize until the vacuum degree in the melting furnace reaches 2.5×10 -3 After Pa, fill high-purity argon as a protective gas; before melting the alloy, first melt the pure titanium metal ingot to further reduce the oxygen content in the cavity, and then carry out alloy melting. During the melting process,...

Embodiment 2～22

[0049] Examples 2-22: On the basis of Example 1, only the atomic percentages among Ni, Co, Fe, Cr, Al and Nb were changed, other steps and conditions were the same as in Example 1, and high-entropy alloys 2 were prepared respectively ~22; Among them, the atomic percentage among Ni, Co, Fe, Cr, Al and Nb is shown in Table 3.

[0050] table 3

[0051]

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Abstract

The invention relates to an Nb microalloyed Ni-Co-Fe-Cr-Al high-entropy alloy, and belongs to the technical field of metal materials. According to the Nb microalloyed Ni-Co-Fe-Cr-Al high-entropy alloy, through adjusting of proportioning of basic components of Al, Ni, Co, Cr and Fe and adding of microelement Nb, forming of an L12 phase is promoted, and occurrence of detrimental phases such as a B2phase, an Laves phase and a sigma phase is avoided; the high-entropy alloy is mainly composed of an FCC phase, the grain size is within 100 [mu]m-400 [mu]m, the yield strength is not lower than 300 MPa, the tensile strength is not lower than 740 MPa, the elongation rate is not lower than 18%, the good toughness and the high yield strength are both achieved, and the Nb microalloyed Ni-Co-Fe-Cr-Al high-entropy alloy meets the requirements of a modern industry for mechanical properties of materials.

Description

technical field [0001] The invention relates to a Nb microalloyed Ni-Co-Fe-Cr-Al high-entropy alloy with high strength and high plasticity, belonging to the technical field of metal materials. Background technique [0002] High-entropy alloys, also known as multi-principal alloys, are a new class of alloys developed in recent years. They are defined as alloys composed of five or more elements in equiatomic ratios or near equiatoms. The content of each major component is 5-35 at.%; In addition, other alloying elements can also be added for alloying, and the addition amount is less than 5 at.%. The multi-principal composition characteristics of high-entropy alloys are different from traditional alloys that have clear matrix elements (such as Fe-based alloys, Ti-based alloys, Al-based alloys, and Ni-based alloys, etc.), so they have a lot of properties in liquid or disordered solid solution states. High mixing entropy, and high mixing entropy can stabilize the solid solution p...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22F1/00
CPCC22C30/00C22F1/00
Inventor 薛云飞曹堂清王本鹏王鲁刘旭东岳晗王富耻
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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