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Medium-entropy alloy with high strength and high wear resistance and preparation method thereof

A high wear resistance, entropy alloying technology, applied in the field of superalloy materials, can solve the problems of increasing time and economic cost, non-uniformity, micro-crack structure, etc., and achieve improved synergy, less material structural defects, and low material density. Effect

Active Publication Date: 2021-04-13
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the patent document whose publication number is CN109594002B discloses a kind of Fe prepared by vacuum arc melting. 25 Ni x co 50-x Mo x Medium-entropy alloys have a yield strength of up to 1.5 GPa, a hardness of 411 Hv, and a plasticity of 31%; however, alloys prepared by smelting often have casting defects such as pores, microcracks, and uneven structures, and subsequent necessary heat treatment processes Will increase time and economic cost

Method used

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  • Medium-entropy alloy with high strength and high wear resistance and preparation method thereof
  • Medium-entropy alloy with high strength and high wear resistance and preparation method thereof
  • Medium-entropy alloy with high strength and high wear resistance and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] Example 1 Co1.1 CrNi 0.9 The preparation method comprises the following steps:

[0030] (1) According to the ratio shown in Table 1, use an electronic balance to weigh the original metal powder:

[0031] Table 1: Alloy raw material ratio (mass ratio wt.%)

[0032]

[0033] ⑵Put Co powder, Cr powder and Ni powder into the cemented carbide tank, and use a planetary high-energy ball mill to grind cemented carbide balls, the ball-to-material ratio is 3:1, the speed is 250r / min, and the protective gas is argon Mixed under gas conditions for 32h, to obtain alloyed powder.

[0034] (3) Add absolute ethanol to the alloying powder as a process control agent, put it into a planetary high-energy ball mill, and mix for 5 hours under the conditions that the grinding balls are cemented carbide balls, the ball-to-material ratio is 3:1, and the rotation speed is 200r / min. , that is, a homogenized fine-grained powder.

[0035] (4) The fine-grained powder is vacuum-dried to consta...

Embodiment 2

[0041] Embodiment 2 (Co 1.1 CrNi 0.9 ) 90 (Al 0.4 Ti 0.6 ) 10 The preparation method comprises the following steps:

[0042] (1) According to the ratio shown in Table 2, use an electronic balance to weigh the original metal powder:

[0043] Table 2: Alloy raw material ratio (mass ratio wt.%)

[0044]

[0045] ⑵Put Co powder, Cr powder, Ni powder, Al powder and Ti powder into the cemented carbide tank, use a planetary high-energy ball mill to grind cemented carbide balls, the ball-to-material ratio is 4:1, and the speed is 280r / min, and mixed for 40 h under the condition that the protective gas is argon to obtain the alloyed powder.

[0046] (3) Add absolute ethanol to the alloying powder as a process control agent, put it into a planetary high-energy ball mill, and mix for 5 hours under the conditions that the grinding balls are cemented carbide balls, the ball-to-material ratio is 3:1, and the rotation speed is 200r / min. , that is, a homogenized fine-grained powde...

Embodiment 3

[0053] Embodiment 3 (Co 1.1 CrNi 0.9 ) 85 (Al 0.4 Ti 0.6 ) 15 The preparation method comprises the following steps:

[0054] (1) According to the ratio shown in Table 3, use an electronic balance to weigh the original metal powder:

[0055] Table 3: Alloy raw material ratio (mass ratio wt.%)

[0056]

[0057] ⑵Put Co powder, Cr powder, Ni powder, Al powder and Ti powder into the cemented carbide tank, use a planetary high-energy ball mill to grind cemented carbide balls, the ball-to-material ratio is 4:1, and the speed is 300r / min, and mixed for 45 h under the condition that the protective gas is argon to obtain the alloyed powder.

[0058] (3) Add absolute ethanol to the alloying powder as a process control agent, put it into a planetary high-energy ball mill, and mix for 5 hours under the conditions that the grinding balls are cemented carbide balls, the ball-to-material ratio is 3:1, and the rotation speed is 200r / min. , that is, a homogenized fine-grained powde...

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Abstract

The invention relates to a medium-entropy alloy with high strength and high wear resistance. The medium-entropy alloy comprises the following components of (Co<1.1> CrNi<0.9>) <100-x> (Al<0.4>Ti<0.6>) <x>, x is a molar ratio, the value range of x is 0-20, the alloy is prepared from the following components of, in percentage by atom through a mechanical alloying process and spark plasma sintering, 29.3-36.7 at.% of Co, 26.7-33.3 at.% of Cr, 24.0-30.0 at.% of Ni, 0-8.0 at.% of Al and 0-12.0 at.% of Ti. Meanwhile, the invention further discloses a preparation method of the medium-entropy alloy. The prepared medium-entropy alloy has excellent strength, plasticity and wear resistance, and has important application prospects in the fields of aerospace and automobile industry high-temperature mechanical transmission moving parts.

Description

technical field [0001] The invention relates to the technical field of superalloy materials, in particular to a high-strength and high-wear resistance medium-entropy alloy and a preparation method thereof. Background technique [0002] Traditional superalloys refer to iron, cobalt and nickel as the matrix, which have high mechanical strength, excellent wear resistance, good fatigue performance and fracture toughness, and can be used at room temperature and high temperature above 600 ° C and specific stress A class of metal materials that work for a long time in an active environment. With the rapid development of modern aerospace, energy, chemical and advanced manufacturing and processing fields, more and more stringent requirements are put forward for traditional superalloys. In order to improve the overall performance of superalloys, alloying design is often carried out by adding expensive refractory metals (Nb, V, Ta, Re, Ru, etc.) to meet demanding application requireme...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/04B22F9/04B22F3/105
CPCB22F3/105B22F9/04B22F2003/1051B22F2009/041B22F2009/043B22F2998/10C22C1/04C22C30/00
Inventor 程军杨军耿钰山刘维民朱圣宇谈辉
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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