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Preparation method of corrosion-resistant high-strength AlCoCrFeNi-Cu high-entropy alloy

A high-entropy alloy and high-strength technology, which is applied in the field of preparation of corrosion-resistant and high-strength AlCoCrFeNi-Cu high-entropy alloys, can solve the problems of reducing material strength, prone to corrosion, and deteriorating the corrosion resistance of alloys, and achieves excellent corrosion resistance. , The corrosion resistance is better than the effect of eliminating macrosegregation

Active Publication Date: 2018-12-18
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] However, due to the relatively high binding enthalpy of Cu, Ag and other elements (generally less than 5 kJ / mol between transition group elements, generally higher than 10 kJ / mol between Cu, Ag and such elements), existing preparation methods ( Cu element segregation exists in Cu-containing high-entropy alloys obtained by smelting, spraying, and hot-pressing sintering), and Cu element segregation deteriorates the corrosion resistance and mechanical properties of such high-entropy alloys.
The segregation of Cu element can cause a large potential difference between tissues. In a corrosive environment, corrosion is prone to occur in the Cu-rich area, which deteriorates the corrosion resistance of the alloy (D.H. Xiao, P.F. Zhou, W.Q. Wu, et al.Microstructure, mechanical and corrosion behaviors of AlCoCuFeNi-(Cr,Ti) highentropy alloys, Materials and Design 116 (2017) 438–447); Cu element segregation forms the FCC (face-centered cubic) phase, and the strength of the FCC phase is low, reducing the strength of the material ( J.M. Zhu, J.L. Meng and J. L.Liang. Microstructure and mechanical properties of multi-principal component AlCoCrFeNiCux alloy, Rare Metals 35, 5 (2016) 385-389)

Method used

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  • Preparation method of corrosion-resistant high-strength AlCoCrFeNi-Cu high-entropy alloy
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  • Preparation method of corrosion-resistant high-strength AlCoCrFeNi-Cu high-entropy alloy

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Embodiment 1

[0028] AlCoCrFeNi alloy is an atomized alloy powder, spherical, with a particle size of less than 30 μm; copper is an electrolytic powder, dendritic, with a particle size of 20-50 μm.

[0029] High-energy ball milling: According to the mass percentage of Cu being 11.18% and the balance of AlCoCrFeNi high-entropy alloy, respectively weigh copper powder and AlCoCrFeNi high-entropy alloy powder, and put them into a WC ball mill jar, WC balls are used as grinding balls, and the ball-to-material ratio is 5 : 1, then mixed for 15 h at a speed of 300 r / min under argon protection to obtain a homogeneously mixed original powder product.

[0030] Liquid-phase assisted SPS sintering: put the mixed powder into the graphite mold, and then place it in the SPS discharge plasma sintering furnace for sintering. The sintering parameters are: the vacuum degree is lower than 5×10 -3 Pa, liquid phase assisted sintering temperature 1150 ºC, applied pressure 30MPa, holding time 5 min, after sinteri...

Embodiment 2

[0034] AlCoCrFeNi alloy is an atomized alloy powder, spherical, with a particle size of less than 30 μm; copper is an electrolytic powder, dendritic, with a particle size of 20-50 μm.

[0035] High-energy ball milling: According to the mass percentage of Cu as 10% and the balance of AlCoCrFeNi high-entropy alloy, respectively weigh copper powder and AlCoCrFeNi high-entropy alloy powder, and put them into a WC ball mill jar, WC balls are used as grinding balls, and the ball-to-material ratio is 10 :1, and then mixed for 30 h under argon protection at a speed of 500 r / min to obtain a homogeneously mixed original powder product.

[0036] Liquid-phase assisted SPS sintering: put the mixed powder into the graphite mold, and then place it in the SPS discharge plasma sintering furnace for sintering. The sintering parameters are: the vacuum degree is lower than 5×10 -3 Pa, liquid phase assisted sintering temperature 1220 ºC, applied pressure 40MPa, holding time 8 min, after sintering...

Embodiment 3

[0040] AlCoCrFeNi alloy is an atomized alloy powder, spherical, with a particle size of less than 30 μm; copper is an electrolytic powder, dendritic, with a particle size of 20-50 μm.

[0041] High-energy ball milling: According to the mass percentage of Cu as 20% and the balance of AlCoCrFeNi high-entropy alloy, respectively weigh Cu powder and AlCoCrFeNi high-entropy alloy powder, and put them into a WC ball mill jar, WC balls are used as grinding balls, and the ball-to-material ratio is 6 : 1, and then mixed for 20 h under argon protection at a speed of 400 r / min to obtain a homogeneously mixed original powder product.

[0042] Liquid-phase assisted SPS sintering: put the mixed powder into the graphite mold, and then place it in the SPS discharge plasma sintering furnace for sintering. The sintering parameters are: the vacuum degree is lower than 5×10 -3 Pa, liquid phase assisted sintering temperature 1120 ºC, applied pressure 30MPa, holding time 4 min, after sintering, th...

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Abstract

The invention discloses a preparation method of a corrosion-resistant high-strength AlCoCrFeNi-Cu high-entropy alloy. The corrosion-resistant high-strength AlCoCrFeNi-Cu high-entropy alloy is preparedby using a high energy ball milling and liquid phase assisted SPS sintering technology. The corrosion-resistant high-strength AlCoCrFeNi-Cu high-entropy alloy prepared by the preparation method of the corrosion-resistant high-strength AlCoCrFeNi-Cu high-entropy alloy has the advantages of the structure is simple; elements are uniformly distributed; the precipitation of a Cu element is avoided, ananometer-sized precipitation / coupling structure is realized; the corrosion resistance is excellent, high strength and high toughness are realized, and wide industrial application prospect is realized.

Description

technical field [0001] The invention relates to a method for preparing a corrosion-resistant high-strength AlCoCrFeNi-Cu high-entropy alloy, specifically a method for eliminating Cu macro-segregation in high-entropy alloys by coupling high-energy ball milling and liquid-phase assisted SPS (spark plasma sintering) sintering. Background technique [0002] In recent years, a kind of alloy that breaks the traditional design concept—high entropy alloy has attracted extensive attention in the field of materials. Traditional alloys generally contain one or two main elements to determine the basic properties of the alloy. The basic properties are optimized to a certain extent by adding a small amount of other elements, such as solid solution materials such as steel with higher toughness and titanium with higher strength. Aluminum alloy and other intermetallic compound materials. High-entropy alloys contain a variety of main elements. By ensuring low atomic size difference, valence ...

Claims

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Application Information

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IPC IPC(8): C22C30/02C22C9/00C22C1/04
CPCC22C1/04C22C1/0425C22C9/00C22C30/02
Inventor 杨军于源刘维民乔竹辉朱圣宇程军谈辉
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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