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Rare earth high entropy bulk amorphous alloy with magnetocaloric effect and its preparation process

A technology of amorphous alloy and magneto-caloric effect, applied in the direction of magnetic objects, heat exchange materials, magnetic materials, etc., can solve the problems of reducing magnetic properties and hindering the movement of magnetic domain walls

Active Publication Date: 2019-07-12
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the magnetism of the material is very sensitive to the structure of the material, the existence of the grain boundary of the polycrystalline material will hinder the movement of the magnetic domain wall under the action of the external magnetic field, so the magnetic properties will be reduced.

Method used

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  • Rare earth high entropy bulk amorphous alloy with magnetocaloric effect and its preparation process
  • Rare earth high entropy bulk amorphous alloy with magnetocaloric effect and its preparation process
  • Rare earth high entropy bulk amorphous alloy with magnetocaloric effect and its preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Preparation (La 1 / 6 Ce 1 / 6 Nd 1 / 6 Tb 1 / 6 co 1 / 6 Cu 1 / 6 ) 85.7 Al 14.3 High entropy bulk amorphous alloy

[0044] Step 1: the purity is 99.5wt% La, Ce, Nd, Tb, 99.9wt% Al and 99.9wt% Cu and Co according to (La 1 / 6 Ce 1 / 6 Nd 1 / 6 Tb 1 / 6 co 1 / 6 Cu 1 / 6 ) 85.7 Al 14.3 The atomic percentage is used for batching;

[0045] Step 2: Mix the above ingredients evenly and put them into an electric arc furnace, perform electric arc melting for 4 times in an argon atmosphere adsorbed by titanium to obtain a uniform alloy composition, and cool to obtain a master alloy ingot;

[0046] Step 3: re-melting the master alloy ingot obtained above under the above conditions, using the adsorption device in the electric arc furnace, sucking the master alloy melt into a water-cooled copper mold with an inner diameter of 5 mm to obtain (La 1 / 6 Ce 1 / 6 Nd 1 / 6 Tb 1 / 6 co 1 / 6 Cu 1 / 6 ) 85.7 Al 14.3 High-entropy bulk amorphous alloys.

[0047] The structural features of high-entrop...

Embodiment 2

[0049] Embodiment 2: prepare La 15 Ce 15 Nd 15 Tb 15 co 15 Cu 15 Al 10 High entropy bulk amorphous alloy

[0050] Step 1: La, Ce, Nd, Tb with a purity of 99.5wt%, Al of 99.9wt%, and Cu and Co of 99.9wt% according to La 15 Ce 15 Nd 15 Tb 15 co 15 Cu 15 Al 10 Atomic percentage for batching;

[0051] Step 2: Mix the above ingredients evenly and put them into an electric arc furnace, perform electric arc melting 4 times in an argon atmosphere adsorbed by titanium to obtain a uniform alloy composition, and cool to obtain a master alloy ingot;

[0052] Step 3: re-melt the master alloy ingot obtained above under the above conditions, and use the adsorption device in the electric arc furnace to suck the master alloy melt into a water-cooled copper mold with an inner diameter of 5 mm to obtain La 15 Ce 15 Nd 15 Tb 15 co 15 Cu 15 Al 10 High-entropy bulk amorphous alloys.

[0053] The structural features of high-entropy bulk amorphous alloys were detected by X-ray di...

Embodiment 3

[0055] Embodiment 3: preparation (La 1 / 6 Ce 1 / 6 Nd 1 / 6 Gd 1 / 6 co 1 / 6 Cu 1 / 6 ) 85.7 Al 14.3 High entropy bulk amorphous alloy

[0056] Step 1: the purity is 99.5wt% La, Ce, Nd, Gd, 99.9wt% Al and 99.9wt% Cu and Co according to (La 1 / 6 Ce 1 / 6 Nd 1 / 6 Gd 1 / 6 co 1 / 6 Cu 1 / 6 ) 85.7 Al 14.3 Atomic percentage for batching;

[0057] Step 2: Mix the above ingredients evenly and put them into an electric arc furnace, perform electric arc melting 4 times in an argon atmosphere adsorbed by titanium to obtain a uniform alloy composition, and cool to obtain a master alloy ingot;

[0058] Step 3: re-melting the master alloy ingot obtained above under the above conditions, using the adsorption device in the electric arc furnace, sucking the master alloy melt into a water-cooled copper mold with an inner diameter of 5 mm to obtain (La 1 / 6 Ce 1 / 6 Nd 1 / 6 Gd 1 / 6 co 1 / 6 Cu 1 / 6 ) 85.7 Al 14.3 High-entropy bulk amorphous alloys.

[0059] The structural features of high-entropy ...

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Abstract

The invention relates to a rare earth high-entropy bulk amorphous alloy with magnetocaloric effect and its preparation process. The rare-earth high-entropy bulk amorphous alloy contains an amorphous phase with a volume fraction of not less than 95%, and various elements are equal to Atomic ratio or nearly equivalent atomic ratio, the alloy composition mainly includes La, Ce, Nd, Tb, Gd, Dy, as well as transition group elements Cu, Co, and the main group III element Al, and its composition can be expressed by the following formula: (La 1 / 6 Ce 1 / 6 Nd 1 / 6 m 1 / 6 co 1 / 6 Cu 1 / 6 ) y Al x . or (La 1 / 6 Ce 1 / 6 Dy 1 / 6 Q 1 / 6 co 1 / 6 Cu 1 / 6 ) b Al a . Due to the adoption of the above technical solution, the present invention produces a rare earth block high-entropy amorphous alloy. Compared with other component-based amorphous high-entropy amorphous, it has good thermal stability and excellent magnetocaloric properties, and has application prospects in magnetic refrigeration functional materials and structural materials.

Description

technical field [0001] The invention belongs to the field of high-entropy bulk amorphous alloys or high-entropy metallic glasses, in particular to a rare earth high-entropy bulk amorphous alloy of La-Ce-(Nd, Tb, Gd, Dy)-Cu-Co-Al Crystalline alloys and their preparation techniques. Background technique [0002] High-entropy alloys (HEAs) are newly developed in the last ten years and are defined as a new material composed of five or more components in an equiatomic ratio or near equiatomic ratio. Due to its various main components, complex structure, and adjustable performance, it has attracted many researchers in both basic science and engineering application research. Some researchers even believe that improving certain properties of high-entropy alloys may allow them to replace traditional materials in many cutting-edge applications. [0003] In recent years, high-entropy bulk amorphous alloys have gradually attracted the interest of researchers. The compositional design...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C45/00C09K5/14
CPCH01F1/012C09K5/14C22C45/00C22C2202/02C22C1/11
Inventor 吕昭平杨铭刘雄军吴渊王辉杜清
Owner UNIV OF SCI & TECH BEIJING
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