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High-entropy alloy with banded precipitated phase and preparation method thereof

A technology of high-entropy alloys and precipitated phases, applied in the field of high-entropy alloys, can solve the problems of poor strength and toughness matching of high-entropy alloys, achieve good room temperature tensile properties, wide composition range, and improve the effect of solid solution strengthening

Active Publication Date: 2019-08-09
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a high-entropy alloy with a banded distribution of precipitates and a preparation method thereof for the problem of poor matching of strength and toughness of high-entropy alloys in the prior art

Method used

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  • High-entropy alloy with banded precipitated phase and preparation method thereof
  • High-entropy alloy with banded precipitated phase and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Co 33.33 Cr 33.34 Ni 33.33 Preparation and Microstructure Observation of High Entropy Alloy

[0028] Described pure cobalt, pure chromium, pure nickel and pure molybdenum all adopt commercially available common pure metals with a purity equal to 99.5%, and the chemical composition is calculated as (at.%) by atomic percentage according to the composition formula: Co: 33.33; Cr: 33.34 ; Ni: 33.33 for batching.

[0029] 1) Put pure cobalt, pure chromium, pure nickel and pure molybdenum into the rust remover and soak for 15 minutes; the rust remover is a mixture of hydrochloric acid, sulfuric acid and deionized water, and the mass percentage is 50% hydrochloric acid And sulfuric acid 3%, all the other are deionized water; The mass percentage concentration of above-mentioned hydrochloric acid is 38%, the mass percentage concentration of sulfuric acid is 75%;

[0030] 2) Ultrasonic cleaning: ultrasonically clean the pickled raw materials in absolute ethanol to ...

Embodiment 2

[0038] Example 2: (CoCrNi) 90 Mo 10 Preparation and Microstructure Observation of High Entropy Alloy

[0039] Described pure cobalt, pure chromium, pure nickel and pure molybdenum all adopt commercially available common pure metals with a purity equal to 99.5%, and the chemical composition is calculated as (at.%) by atomic percentage according to the composition formula: Co: 30; Cr: 30 ; Ni: 30; Mo: 10 for batching.

[0040] 1) Put pure cobalt, pure chromium, pure nickel and pure molybdenum into the rust remover and soak for 10-20 minutes; the rust remover is a mixture of hydrochloric acid, sulfuric acid and deionized water, and the mass percentage is hydrochloric acid 50% and sulfuric acid 3%, all the other are deionized water; the mass percentage concentration of above-mentioned hydrochloric acid is 38%, the mass percentage concentration of sulfuric acid is 75%;

[0041] 2) Ultrasonic cleaning: ultrasonically clean the pickled raw materials in absolute ethanol to remove o...

Embodiment 3

[0049] Embodiment 3: (CoCrNi) 90 Mo 10 Preparation and Microstructure Observation of High Entropy Alloy

[0050] The other steps are the same as in Example 2, except that the hot-rolled alloy plate is homogenized at 1200° C. for 1 hour, and then water-cooled to room temperature; finally, the high-entropy alloy strengthened by band-shaped precipitates according to the present invention is obtained.

[0051] the result shows, figure 1 C (CoCrNi) 90 Mo 10 The structure of the alloy has a banded precipitated phase structure; figure 1 In D, the size of the precipitated phase is 0.1 to 2 μm. Since the experimental alloy has a band-shaped distribution of precipitation-strengthening phases, and the σ-precipitated phase accounts for 45%, its tensile mechanical properties at room temperature are very excellent. figure 2 gives Co 33.33 Cr 33.34 Ni 33.33 , (CoCrNi) 90 Mo 10 Room temperature stress-strain curves of two high-entropy alloys in the annealed state. Its tensile str...

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Abstract

The invention discloses a high-entropy alloy with a banded precipitated phase. The high-entropy alloy consists of Co, Cr, Ni and Mo elements, wherein the atomic percent of Co is 25-35%, the atomic percent of Cr is 25-35%, the atomic percent of Ni is 25-35%, the atomic percent of Mo is 5-15%, and the sum of atomic percents of the components is 100%. The phase composition of the high-entropy alloy with the banded precipitated phase comprises a face-centered cubic phase and a sigma precipitated phase, wherein the sigma precipitated phase accounts for 40-60%. In the preparation method, the non-uniform precipitation of the Mo-rich phase is achieved through the combination of hot processing, solid solution processing, cold processing and annealing process, and the high-entropy alloy with the banded precipitated phase is obtained. The alloy can ensure excellent strength and toughness matching, and has application prospects in the fields of cutter materials, aerospace materials and the like.

Description

technical field [0001] The invention relates to the field of high-entropy alloys, in particular to a method for preparing high-entropy alloys with band-shaped precipitates; common metals (such as cobalt, nickel, chromium, molybdenum) are used as components, through suitable composition design and Subsequent processing produces high-entropy alloys with banded precipitates, resulting in excellent room-temperature tensile properties. Background technique [0002] High-entropy alloys (HEAs) are proposed as a new concept, which maximizes the configuration entropy and forms a single-phase microstructure by combining multiple elements at equimolar or near equimolar ratios. The unique design concept makes high-entropy alloys also exhibit specificity different from traditional alloys in terms of performance, such as ultra-low temperature toughness, high strength toughness, high hardness, and radiation resistance. [0003] The development of the aerospace industry has put forward hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/02C22F1/10
CPCC22C1/02C22C19/07C22C30/00C22F1/10
Inventor 方伟常若斌殷福星于浩洋白曦
Owner HEBEI UNIV OF TECH
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