High-entropy alloy with dispersion nano-sized precipitate strengthening effect and preparing method thereof

A nano-precipitate, high-entropy alloy technology, applied in the field of high-entropy alloys, can solve problems such as the inability to obtain higher strength, and achieve the effects of excellent room temperature and high temperature tensile properties, wide preparation conditions, and large composition range.

Active Publication Date: 2015-06-10
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high-temperature rheological experiments of FeCoNiCrMn high-entropy alloys show that only relying on the lattice distortion and slow diffusion effect of a single FCC matrix, high strength cannot be obtained at high temperatures. Therefore, it is necessary to introduce other alloy strengthening mechanisms to further improve the FCC class. High-temperature strength and rheological resistance of high-entropy alloys to improve their high-temperature service performance

Method used

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  • High-entropy alloy with dispersion nano-sized precipitate strengthening effect and preparing method thereof
  • High-entropy alloy with dispersion nano-sized precipitate strengthening effect and preparing method thereof
  • High-entropy alloy with dispersion nano-sized precipitate strengthening effect and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Fe a co b Ni c Cr d Ti p Al q Preparation and Microstructure of High Entropy Alloys

[0026] Adopt commercially available pure metals Fe, Co, Ni, Cr, Ti, Al with a purity higher than 99.9% (mass percentage), according to the composition formula Fe a co b Ni c Cr d Ti p Al q(Atomic molar ratio, 0≤a≤35, 0≤b≤35, 0≤c≤35, 0≤d≤35, 0≤p≤10, 0≤q≤10) for batching, repeated arc melting 4 times Afterwards, it is leak-cast into a water-cooled copper mold of 10mm x 10mm to obtain an initial cast state high-entropy alloy ingot. Subsequent wire cutting into alloy sheets of suitable thickness, and cold rolling deformation of 30% reduction, heat preservation at 1000°C for 2 hours, quenching; heat preservation at 800°C for 18 hours, quenching, and finally obtain the dispersible alloy of the present invention. High-entropy alloys strengthened by nano-precipitates. figure 1 with figure 2 Alloys with different ratios of Ti and Al are shown respectively (a, b, c, d, ...

Embodiment 2

[0027] Example 2: Fe a co b Ni c Cr d Ti p Al q Mechanical Properties of High Entropy Alloys at Room Temperature

[0028] Common pure metals Fe, Co, Ni, Cr, Ti, Al that are commercially available with a purity higher than 99.9% (mass percentage) are used according to the composition formula Fe a co b Ni c Cr d Ti p Al q (Atomic molar ratio, 0≤a≤35, 0≤b≤35, 0≤c≤35, 0≤d≤35, 0≤p≤10, 0≤q≤10) for batching, repeated arc melting 4 times Afterwards, it is leak-cast into a water-cooled copper mold of 10mm x 10mm to obtain an initial cast state high-entropy alloy ingot. Then wire cutting into alloy sheets of suitable thickness, and 50% reduction of cold rolling deformation, 1.5 hours of heat preservation at 1050 ° C, quenching; 10 hours of heat preservation at 700 ° C, quenching, and finally the present invention has the dispersion High-entropy alloys strengthened by nano-precipitates. Finally, the high-entropy alloy with dispersed nano-phase precipitation strengthening des...

Embodiment 3

[0033] Example 3: Fe a co b Ni c Cr d Ti p Al q Nb e Preparation and High Temperature Mechanical Properties of High Entropy Alloys

[0034] Common pure metals Fe, Co, Ni, Cr, Ti, Al, Nb with a commercially available purity higher than 99.9% (mass percentage) are used according to the composition formula Fe a co b Ni c Cr d Ti p Al q Nb e (Atomic molar ratio, 0≤a≤35, 0≤b≤35, 0≤c≤35, 0≤d≤35, 0≤p≤10, 0≤q≤10, 0≤e≤35) for batching, After repeated arc melting for 4 times, it was leak-cast into a 10mm x 10mm water-cooled copper mold to obtain an initial cast high-entropy alloy ingot. Subsequent wire cutting into alloy sheets of appropriate thickness, and 20% cold rolling deformation, heat preservation at 950°C for 0.5 hours, quenching; heat preservation at 750°C for 6 hours, quenching, and finally obtain the dispersible alloy of the present invention. High-entropy alloys strengthened by nano-precipitates. Finally, the high-entropy alloy with dispersed nano-precipitatio...

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Abstract

The invention discloses high-entropy alloy with the dispersion nano-sized precipitate strengthening effect and a preparing method thereof. The method comprises the steps of removing oxidized skin of a metal material, and then conducting weighing and burdening accurately according to a ratio; conducing smelting in an electric-arc furnace in an argon shield atmosphere of titanium absorbed oxygen to obtain an initial high-entropy alloy ingot, and conducting cold rolling, wherein rolling reduction is 20-50%; placing the ingot in a heat treatment furnace with a temperature ranging from 900 DEG C to 1000 DEG C for heat preservation for 0.5-2 hours, and conducting quenching; placing the ingot in a heat treatment furnace with a temperature ranging from 700 DEG C to 800 DEG C for heat preservation for 2-18 hours, and conducting quenching. By means of precipitation strength, on the premise that high plasticity is kept, yield strength and tensile strength are improved greatly. The room-temperature tensile strength of (FeCoNiCr)94Ti2Al4 in the final state reaches 1094 MPa, plastic elongation is 35%, work hardening effect is remarkable, comprehensive room-temperature mechanical property is prominent, high-temperature tensile strength can reach 400 MPa at the temperature of 800 DEG C and strain rate of 10<-3>, steady creep rate is smaller than or equal to 10<-8> under the stress of 100 MPa and at the temperature of 750 DEG C, and high-temperature tensile strength and creep mechanical property are excellent.

Description

Technical field: [0001] The invention relates to the field of high-entropy alloys, in particular to a class of common metals (such as iron, aluminum, cobalt, nickel, titanium, chromium, manganese, copper) as components, which are produced through suitable composition design and subsequent treatment process A high-entropy alloy with dispersed nano-precipitated second phase is obtained, so as to obtain excellent room temperature tensile properties (high strength and plasticity, or strong plastic product) and outstanding high-temperature rheological and creep properties. Background technique: [0002] Unlike conventional metal materials, high-entropy alloys do not have a single principal element, but an alloy system composed of multiple principal elements (the molar content of each component is between 10% and 35%), which has high mixing entropy, large crystal Therefore, it has excellent mechanical properties in all aspects, mainly including compressive strength, hardness, wear...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/02
Inventor 吕昭平何骏阳王辉吴渊刘雄军黄海龙
Owner UNIV OF SCI & TECH BEIJING
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