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BCC-based high-strength, high-entropy and high-temperature alloy for coherent precipitation of cubic nano particles

A high-temperature alloy and nanoparticle technology, applied in the field of new materials, can solve the problems of high BCC strength, high alloy brittleness and low plasticity, and achieve improved alloy strength, excellent high temperature oxidation resistance and corrosion resistance, and simple preparation process. Effect

Active Publication Date: 2018-01-09
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

FCC has low strength and high plasticity, BCC has high strength and low plasticity, especially the BCC phase and B2 phase are mostly manifested as a braided network amplitude modulation decomposition structure, which makes the alloy very brittle

Method used

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  • BCC-based high-strength, high-entropy and high-temperature alloy for coherent precipitation of cubic nano particles
  • BCC-based high-strength, high-entropy and high-temperature alloy for coherent precipitation of cubic nano particles
  • BCC-based high-strength, high-entropy and high-temperature alloy for coherent precipitation of cubic nano particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Al 12.5 Cr 35 Fe 17.5 co 17.5 Ni 17.5 (at.%) Alloy

[0019] Step 1: Alloy Preparation

[0020] A BCC-based high-strength and high-entropy superalloy with coherent precipitation of cubic nanoparticles of the present invention belongs to Al-Cr-Mn-Fe-Co-Ni (conventional superalloy system) and satisfies the condition (a). The high-entropy alloy uses high-purity components, and the elements are dosed according to mass percentage, which is Al 6.49 Cr 35.05 Fe 18.82 co 19.86 Ni 19.78 (wt.%). Put 15g of the mixture in a water-cooled copper crucible of an electric arc melting furnace, and use a non-consumable arc melting method to melt under the protection of an argon atmosphere. Repeat this process for at least 5 times to obtain an alloy ingot with a uniform composition; The uniform alloy ingot is melted, and the melt is sucked into the cylindrical copper mold cavity by the copper mold suction casting process to obtain a rod with a diameter of 6mm.

[002...

Embodiment 2

[0024] Example 2: Al 8.33 Ti 4.17 Cr 26.25 Fe 26.25 co 17.5 Ni 17.5 (at.%) Alloy

[0025] Step 1: Alloy Preparation

[0026] A BCC-based high-strength and high-entropy superalloy with coherent precipitation of cubic nanoparticles of the present invention belongs to Al-Ti-Cr-Mn-Fe-Co-Ni (conventional superalloy system) and satisfies the condition (b). The high-entropy alloy uses high-purity components, and the elements are dosed according to mass percentage, Al 4.23 Ti 3.76 Cr 25.69 Fe 27.59 co 19.41 Ni 19.33 (wt.%). Put 15g of the mixture in a water-cooled copper crucible of an electric arc melting furnace, and use a non-consumable arc melting method to melt under the protection of an argon atmosphere. Repeat this process for at least 5 times to obtain an alloy ingot with a uniform composition; The uniform alloy ingot is melted, and the melt is sucked into the cylindrical copper mold cavity by the copper mold suction casting process to obtain a rod with a diameter...

Embodiment 3

[0030] Example 3: Al 12.5 Ti 12.5 Zr 12.5 Nb 25 Ta 25 Mo 12.5 (at.%) Alloy

[0031] Step 1: Alloy Preparation

[0032] A BCC-based high-strength and high-entropy superalloy with coherent precipitation of cubic nanoparticles of the present invention belongs to Al-Ti-Zr-Nb-Ta-Mo (refractory alloy system) and satisfies the condition (c). Using high-purity components, the elements are dosed according to mass percentage, Al 3.33 Ti 5.91 Zr 11.27 Nb 22.95 Ta 44.69 Mo 11.85 (wt.%). Put 15g of the mixture in a water-cooled copper crucible of an electric arc melting furnace, and use a non-consumable arc melting method to melt under the protection of an argon atmosphere. Repeat this process for at least 5 times to obtain an alloy ingot with a uniform composition; The uniform alloy ingot is melted, and the melt is sucked into the cylindrical copper mold cavity by the copper mold suction casting process to obtain a rod with a diameter of 6mm.

[0033] Step 2: Alloy structure...

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Abstract

The invention relates to a BCC-based high-strength, high-entropy and high-temperature alloy for coherent precipitation of cubic nano particles, and belongs to the technical field of new materials. Thealloy comprises Fe, Co, Ni, Mn, Cr, Mo, Nb, Ta, Al, Ti and Zr, and the atomic percentage expression of the alloy composition is Alx(Ti, Zr)y(Nb, Ta)z(Cr, Mo, Fe)m(Co, Ni)n, where x=5-18%, y=0-55%, z=0-55%, m=0-60%, n=0-40%, and x+y+z+m+n=100%. The material performance indexes are: tensile strength Sigma b=1200-2150 MPa, and hardness HV=550-650 at room temperature; Sigma b=350-900 MPa, and HV=120-350 at 700 DEG C; Sigma b=200-450 MPa, and HV=70-200 at 1000 DEG C. According to the BCC-based high-strength, high-entropy and high-temperature alloy provided by the invention, through composition design, the organization and control of the coherent precipitation of BBC / B2 cubic particles are achieved, so that the maximum improvement of the alloy strength is ensured, and the high-temperature strength, creep resistance, oxidation resistance and corrosion resistance of the alloy are improved. The alloy is a kind of novel high-temperature alloy.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a multi-element BCC-based high-entropy alloy which has coherent precipitation of cubic nanoparticles, high strength and great plasticity, and can be applied in a high-temperature environment. Background technique [0002] The mechanical properties of high-performance engineering alloys are closely related to their microstructure, especially the high-temperature strength, which is mainly controlled by the morphology, size and distribution of the second phase particles precipitated on the solid solution matrix. For example, Ni-based superalloys exhibit excellent mechanical properties unmatched by other alloys at high temperatures, mainly due to their unique microstructure, that is, the ordered phase particles of cubic shape are coherently precipitated on the solid solution matrix. This type of superalloy is an alloy with complex composition. More than ten kinds of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/02
Inventor 王清马跃李春玲李晓娜董闯王英敏羌建兵
Owner DALIAN UNIV OF TECH
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