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Blocky high-entropy metallic glass and preparation method thereof

A technology of metallic glass and bulk height is applied in the field of bulk high-entropy metallic glass and its preparation, and achieves the effects of high amorphous forming ability, simple process and low cost

Active Publication Date: 2014-02-19
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing high-entropy amorphous alloy components often contain noble metals, such as: Pd, Pt, Ag, or contain toxic elements Be, etc.
In addition, the currently commonly used high-entropy alloy preparation methods, such as deposition, cladding, etc., are only used for surface modification of materials or preparation of thin film materials

Method used

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  • Blocky high-entropy metallic glass and preparation method thereof
  • Blocky high-entropy metallic glass and preparation method thereof
  • Blocky high-entropy metallic glass and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0044] The preparation method of the above-mentioned bulk high-entropy metallic glass comprises the following process:

[0045] Step 1: Prepare copper zirconium titanium fused ingot and aluminum nickel fused ingot.

[0046] In the first step, the process of preparing a copper-zirconium-titanium ingot is: under the conditions of a voltage of 35-45 V and a current of 135-155 A, copper, zirconium and titanium are smelted, and the single smelting time is 40-60s , the number of smelting is 3 to 5 times, and when the ingot is melted between each time, the upper and lower surfaces of the ingot are turned upside down; the atomic percentages of copper, zirconium and titanium in the overall ingot are: copper: 23% to 31%; zirconium: 22 %~32%; Titanium: 9%~31%. The process of preparing aluminum-nickel smelting ingots is: under the conditions of voltage 25-30 V and current 125-140 A, aluminum and nickel are smelted, the single smelting time is 40-60 s, and the number of smelting times is ...

Embodiment 1

[0054] 1 By studying the mixing enthalpy (ΔH mix ), vacancy formation energy (ΔH h ) and configuration entropy (S config ), calculate the Gibbs free energy (ΔG) of the alloy composition, according to the parameter Φ =ΔH mix ·S config ·ΔH h Draw a graph of the relationship between the composition and the ability to form amorphous, select Φ The composition at the absolute maximum is smelted.

[0055] 2 Preparation of raw materials: The raw materials used in the examples are all pure metals (purity ≥ 99.5%), weighed according to a certain molar ratio, and used for melting and preparing alloys. Raw materials include copper, zirconium, titanium, nickel and aluminum, of which copper is 23 at.%, zirconium is 22 at.%, titanium is 19 at.%, nickel is 31 at.% and aluminum is 5 at.% in atomic percentage %.

[0056] 3 Purification of raw materials: Use absolute ethanol to perform multiple ultrasonic cleaning on the weighed raw materials to remove surface pollution generated durin...

Embodiment 2

[0073] Preparation method is identical with embodiment 1, difference is:

[0074] In step 2, the atomic percentages of the five elements are different. In this embodiment, copper is 31 at.%, zirconium is 28 at.%, titanium is 9 at.%, nickel is 14 at.% and aluminum is 18 at.%. %.

[0075] In step (f) of step 4, when smelting aluminum Al and nickel Ni, a voltage of 30V and a current of 140A are used. A single smelting time is 60 s, and the number of smelting times is 5 times, and the upper and lower surfaces of the ingot must be turned upside down between each time. When smelting copper Cu, zirconium Zr and titanium Ti, the voltage is 45 V and the current is 155 A. The single smelting time is 40s, and the number of smelting times is 5 times, and the upper and lower surfaces of the ingot must be turned upside down between each time.

[0076] In step (b) of step 5, use a voltage of 28V and a current of 130A to melt 2 ingots into a whole ingot. The number of smelting times is 4 t...

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Abstract

The invention discloses blocky high-entropy metallic glass. The blocky high-entropy metallic glass comprises, by atomic percent, 23-31% of copper, 22-32% of zirconium, 9-31% of titanium, 14-31% of nickel, 5-18% of aluminum and less than 0.5% of impurities. The blocky high-entropy metallic glass has high strength, high plasticity and high amorphous material-forming ability. The invention also discloses a preparation method of the blocky high-entropy metallic glass. The preparation method has simple processes. Through the preparation method, high-entropy metallic glass rods of which the diameters greater than or equal to 1.5mm are obtained.

Description

technical field [0001] The invention belongs to the field of metal material preparation, and specifically relates to a bulk high-entropy metallic glass and a preparation method thereof. Background technique [0002] The composition of high-entropy alloys (HEAs) includes at least five alloying elements, and the atomic percentage of each element is between 5% and 35%. The production of HEAs breaks the traditional design framework of alloy composition based on one element. The high mixing entropy of alloys is an important feature that distinguishes HEAs from traditional alloys. The high mixing entropy of the mixed main elements makes the multi-element alloy tend to form a simple crystal phase-simple solid solution structure (generally body-centered cubic structure (BCC) or face-centered cubic structure (FCC), or a combination of two solid solutions mixed structure), which inhibits the formation of brittle intermetallic compounds. The high entropy effect can effectively reduc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C45/00
Inventor 潘冶吴继礼陆韬皮锦红
Owner SOUTHEAST UNIV
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