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2.0 GPa-grade ultrahigh-yield-strength plastic CoCrNi-based medium-entropy alloy and preparation method thereof

A yield strength and entropy alloy technology, which is applied in the field of high-performance alloy material preparation, can solve problems such as the limitation of strength improvement, and achieve the effect of yield strength improvement and strong solid solution strengthening effect

Active Publication Date: 2022-02-25
SHENYANG AEROSPACE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, under the premise of maintaining a certain plasticity, the ability to increase the strength, especially the yield strength, is limited.

Method used

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  • 2.0 GPa-grade ultrahigh-yield-strength plastic CoCrNi-based medium-entropy alloy and preparation method thereof
  • 2.0 GPa-grade ultrahigh-yield-strength plastic CoCrNi-based medium-entropy alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) The preparation composition is (Co 40 Ni 30 Cr 20 al 5 Ti 5 ) 0.995 Mo 0.5 (at.%) alloy, wherein the subscript of each element is the atomic percentage of the element, which is melted and cast into a 5Kg ingot by a vacuum induction furnace;

[0027] (2) performing a homogenization treatment on the ingot at 1200°C / 12h and quenching to room temperature to form a homogenization treatment casting;

[0028] (3) performing a solution heat treatment at 1200°C / 2h on the homogenized casting and quenching to room temperature to obtain a single-phase alloy casting with a face-centered cubic structure (FCC);

[0029] (4) Carrying out cold deformation (cold rolling or swaging at room temperature) with a deformation amount of 80% to the alloy casting after solution heat treatment;

[0030] (5) Perform aging heat treatment at 650° C. / 24 h on the cold-deformed part to obtain the plastic CoCrNi-based medium-entropy alloy (sheet or rod) with ultra-high yield strength.

[0031...

Embodiment 2

[0034] (1) The preparation is Co 43 Ni 30 Cr 15 al 6 Ti 6 (at.%) alloy, melted and cast into 5Kg ingot by vacuum induction furnace;

[0035] (2) performing a homogenization treatment on the ingot at 1000°C / 20h and quenching to room temperature to form a homogenization treatment casting;

[0036] (3) performing a solution heat treatment at 1200°C / 3h on the homogenized casting and quenching to room temperature to obtain a single-phase alloy casting with a face-centered cubic structure (FCC);

[0037] (4) Carry out cold deformation (cold rolling or swaging at room temperature) with a deformation amount of 75% to the alloy casting after solution heat treatment;

[0038] (5) Perform aging heat treatment at 650° C. / 28 h on the cold-deformed part to obtain the plastic CoCrNi-based medium-entropy alloy (sheet or rod) with ultra-high yield strength.

[0039] to 10 -3 the s -1 The obtained alloy sample is stretched at a certain tensile rate, and at room temperature, the tensile pl...

Embodiment 3

[0041] (1) The preparation composition is (Co 40 Ni 30 Cr 20 al 5 Ti 5 ) 0.985 Mo 1.5 (at.%) alloy, melted and cast into 5Kg ingot by vacuum induction furnace;

[0042] (2) performing a homogenization treatment on the ingot at 1100°C / 24h and quenching to room temperature to form a homogenization treatment casting;

[0043] (3) performing a solution heat treatment at 1200°C / 4h on the homogenized casting and quenching to room temperature to obtain a single-phase alloy casting with a face centered cubic structure (FCC);

[0044] (4) Carry out cold deformation (cold rolling or swaging at room temperature) with a deformation amount of 75% to the alloy casting after solution heat treatment;

[0045] (5) Perform aging heat treatment at 700° C. / 12 h on the cold-deformed part to obtain the plastic CoCrNi-based medium-entropy alloy (sheet or rod) with ultra-high yield strength.

[0046] to 10 -3 the s -1 The obtained alloy sample was stretched at a certain tensile rate. At roo...

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Abstract

The invention belongs to the field of preparation of high-performance alloy materials, and particularly relates to a 2.0 GPa-grade ultrahigh-yield-strength plastic CoCrNi-based medium-entropy alloy and a preparation method thereof. The alloy is prepared through fusion casting, homogenization treatment, solid solution heat treatment, cold deformation and aging heat treatment. Through cold deformation and aging heat treatment, the prepared alloy has a dual heterogeneous micro-structure formed by discontinuous precipitation and incomplete recrystallization of a strengthening phase. The CoCrNi-based medium-entropy alloy disclosed by the invention has ultrahigh yield strength (2.0 GPa) and sufficient use safety (uniform elongation is greater than 8%), can be processed into various forms of products, and is widely applied to the production of fasteners used in the fields of aerospace, navigation, petroleum and natural gas, food processing, springs, non-magnetic components, instrument parts and the like.

Description

technical field [0001] The invention belongs to the field of preparation of high-performance alloy materials, and in particular relates to a 2.0GPa class ultra-high yield strength plastic CoCrNi-based medium-entropy alloy and a preparation method thereof. Background technique [0002] The corrosion-resistant alloy system has ultra-high yield strength, which endows the structural alloy with excellent resistance to stress corrosion cracking under high stress conditions, enabling the alloy to obtain good service performance in harsh service environments. This high performance is especially suitable for aerospace fasteners, space shuttle structures, chemical processing, medical, cryogenic equipment, marine equipment, oil and gas, food processing, springs, non-magnetic components, instrument parts and other fields. Before the mid-1970s, the standard fasteners used in aerospace used H-11 alloy (AMS6408), which is a variant of hot work die steel. 8%), it has a yield strength close...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22F1/00
CPCC22C30/00C22F1/002C22F1/00C22F1/10C22C19/07C22C19/03
Inventor 杜兴蒿史传鑫盖业辉金城焱闫霏武保林段国升杨明澄祖润峰王大鹏
Owner SHENYANG AEROSPACE UNIVERSITY
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