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Whisker strengthened and toughened FCC high-entropy alloy composite material and preparation method thereof

A high-entropy alloy and composite material technology, applied in the field of composite materials and their preparation, can solve the problems of low strength and hardness, limited application of structural materials, and difficulty in giving full play to the superior properties of high-entropy alloys, and achieves comprehensive mechanical properties improvement. The effect of hardness and plasticity improvement

Active Publication Date: 2020-06-30
TAIZHOU UNIV
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Problems solved by technology

However, the strength and hardness of this type of alloy are very low (for example, the yield strength of the as-cast alloy at room temperature is only about 200MPa), which greatly limits its application as a structural material, making it difficult to fully exert the superior properties of high-entropy alloys.

Method used

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  • Whisker strengthened and toughened FCC high-entropy alloy composite material and preparation method thereof
  • Whisker strengthened and toughened FCC high-entropy alloy composite material and preparation method thereof
  • Whisker strengthened and toughened FCC high-entropy alloy composite material and preparation method thereof

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preparation example Construction

[0018] A preparation method for whisker strengthening and toughening FCC high-entropy alloy composite material, the preparation steps comprising:

[0019] (1) Preparation of FCC high-entropy alloy powder: Al(5~35at.%), Fe(5~35at.%), Co(5~35at.%), Cr(5~35at.%), Ni(5 ~35at.%) and other pure metal powders are mixed in proportion, and the powders are ground and put into a stainless steel ball mill tank for ball milling. During ball milling, high-purity argon is introduced into the tank, and a certain amount of n-heptane is added as a process control agent to prevent powder cold welding and oxidation. After ball milling for 30-40 hours, the powder is alloyed, and FCC structure solid solution alloy powder is obtained;

[0020] (2) Preparation of FCC high-entropy alloy / whisker composite powder: Weigh and prepare a mixed powder containing 1-3wt.% oxide whisker or boride whisker, put the mixed powder and stainless steel ball into the polyurethane mixing tank Add absolute ethanol to s...

Embodiment 1

[0023] Refer to the accompanying drawings in the manual figure 1 , the microscopic morphology of Al0.3FeCoCrNi powder ball milled for 40 hours, it can be seen that the macroscopic morphology of the alloy powder is agglomerated particles with a size of about 20-50 μm ( figure 1 a: SEM morphology); the actual grain size of the powder alloy is about 20nm ( figure 1 b: TEM morphology), its high-resolution morphology shows that the powder alloy includes solid solution crystal and amorphous structure ( figure 1 c: HRTEM morphology).

[0024] Refer to the attached figure 2 , It can be seen that the phase structure of the bulk alloy consists of the main phase of FCC solid solution and a small amount of carbide phase.

Embodiment 2

[0026] The mechanical properties of samples added with 2wt.% zirconia whiskers are shown in Table 1. The compressive yield strength, compressive strength, flexural strength, hardness and compressive plastic strain are 1726±17MPa, 2403±15MPa, 1520±20MPa, respectively. 507±4HV and 25.7±0.5%, respectively increased by 8.8%, 4.6%, 22.3%, 4.1% and 5.5% compared with the samples without whiskers.

[0027] Table 1 sample mechanical properties data

[0028]

[0029]

[0030] Please refer to the attached picture of the manual image 3 The SEM morphology of the bending fracture of the sample added with 2wt.% zirconia whiskers is shown. It can be seen that the fracture of the composite material containing zirconia whiskers has deeper dimples, showing obvious ductile fracture characteristics. On the fracture surface of the composite material, it can also be observed that the zirconia whiskers are evenly distributed in the alloy. Compared with the base alloy, the strength, hardnes...

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Abstract

The invention discloses a whisker strengthened and toughened FCC high-entropy alloy composite material and a preparation method thereof. The whisker strengthened and toughened FCC high-entropy alloy composite material comprises the following components of, in percentage by weight, 97wt.%-99wt.% of high-entropy alloy and 1wt.%-3wt% of whisker; a block body composite material is prepared by adoptinga powder metallurgy method (mechanical alloying and sintering), the preparation method of the whisker strengthened and toughened FCC high-entropy alloy composite material comprises the following preparation steps that (1) FCC high-entropy alloy powder is prepared, namely, pure metal powder such as (5 at.% to 35 at.%) Al, (5 at.% to 35 at.%) Fe, (5at.% to 35 at.%) Co, (5 at.% to 35 at.%) of Cr and(5 at.% to 35 at.%) of Ni are are mixed in proportion, the powder is ground and then the powder is putted into a stainless steel ball milling tank for ball milling, during ball milling, high-purity argon is introduced into the tank, a certain amount of n-heptane is added to serve as a process control agent, cold welding and oxidation of the powder are prevented, and alloying of the powder is achieved after ball milling is conducted for 30 h to 40 h. The whisker strengthened and toughened FCC high-entropy alloy composite material and the preparation method thereof have the beneficial effect that after the whiskers are added, the yield strength, the compressive strength, the bending strength, the hardness and the plasticity of the FCC high-entropy alloy are all improved, and the comprehensive mechanical property is obviously improved.

Description

technical field [0001] The invention relates to a composite material and a preparation method thereof, in particular to a whisker-strengthened FCC high-entropy alloy composite material and a preparation method thereof. Background technique [0002] High-entropy alloys are a new type of metal material developed in recent years. They usually exhibit superior properties that traditional alloys cannot match, such as high strength and toughness, high wear resistance, and excellent thermal stability. High-entropy alloys with a face-centered cubic (FCC) structure have excellent plasticity and toughness, and their fracture toughness is higher than that of most traditional metal materials. However, the strength and hardness of this type of alloy are very low (for example, the yield strength of the as-cast alloy at room temperature is only about 200 MPa), which greatly limits its application as a structural material, making it difficult to fully exert the superior properties of high-e...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/05C22C1/10
CPCC22C1/05C22C30/00
Inventor 程虎孔俊峰夏凡金源方一航
Owner TAIZHOU UNIV
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