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Lutetium-based bulk amorphous alloy and preparation method thereof

An amorphous alloy and base block technology, applied in the field of alloys, can solve problems such as limited composition system, and achieve the effects of inhibiting crystallization ability, abundant rare earth resources, and low critical cooling rate

Inactive Publication Date: 2012-02-22
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although people have researched and developed several series of bulk amorphous alloys, their composition systems are still limited.

Method used

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  • Lutetium-based bulk amorphous alloy and preparation method thereof
  • Lutetium-based bulk amorphous alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, Lu 39 Y 16 Al 25 co 20 Preparation of bulk amorphous alloys

[0029] Use Lu, Y, Al and Co with a purity of more than 99.9% and a molar ratio of 39:16:25:20 to prepare a lutetium-based bulk amorphous alloy. Melt in an electric arc furnace with an argon atmosphere, mix evenly, and obtain a master alloy ingot of Lu-Y-Al-Co quaternary alloy after cooling; then use a conventional metal mold casting method to remelt the ingot and use The suction casting device sucks the master alloy melt into the water-cooled copper mold, and the composition is Lu 39 Y 16 Al 25 co 20 , a bulk amorphous alloy with a diameter of 3 to 5 mm.

[0030] Such as figure 1 X-ray diffraction (XRD) shown proves that the alloy is completely amorphous. Such as figure 2 The thermal analysis (DSC) diagram shown, its glass transition temperature (T g ), crystallization onset temperature (T x ), the width of the subcooling interval (ΔT=T x -T g ) are 687, 769 and 83K, respectively...

Embodiment 2～9

[0032] Various ratios of lutetium-based bulk amorphous alloys were prepared according to the method of Example 1, and their compositions and thermophysical parameters are listed in Table 1.

[0033] Table 1. Composition and thermophysical parameters of lutetium-based bulk amorphous alloys

[0034] Reality

Shi

example

alloy composition

T g

(K)

T x

(K)

T m

(K)

T l

(K)

ΔT g

(K)

T rg

r

1

Lu 39 Y 16 Al 25 co 20

687

769

1072

1117

82

0.641

0.426

2

Lu 55 Al 25 co 20

701

781

1127

1167

80

0.622

0.418

3

Lu 45 Y 10 Al 25 co 20

698

775

1093

1136

77

0.639

0.423

4

Lu 27.5 Y 27.5 Al 25 co 20

673

756

...

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Abstract

The invention relates to a lutetium-based bulk amorphous alloy, which uses lutetium as the main component and contains at least 50% by volume of an amorphous phase, and its composition is shown in formula I, wherein: X is zirconium or / and yttrium, 20 ≤a≤60, 0≤b<30, 20≤c<30, 10≤d<30, and a+b+c+d=100. The alloy is prepared by smelting each of the above-mentioned components according to the required atomic ratio in an electric arc furnace with titanium adsorbing argon atmosphere to obtain a master alloy ingot; The ingot is re-melted, and the melt is sucked into the water-cooled copper mold by using the suction casting device in the electric arc furnace. The lutetium-based bulk amorphous alloy of the invention has strong ability to inhibit crystallization and is easy to form a large-sized amorphous alloy; moreover, the preparation is simple and the cost is low. Lu aX bAl cCo d (Formula I)

Description

technical field [0001] The present invention relates to an alloy, in particular to a lutetium-based block with heavy rare earth element lutetium (Lu) as the main component, an appropriate amount of alloying elements added, and at least 50% of the amorphous phase (volume percentage) amorphous alloy. Background technique [0002] Metallic glass is a new type of metal alloy with good application prospects. It has many excellent properties, such as extremely high strength (close to theoretical strength); good elasticity (elastic limit is about 2%, while the general crystalline metal is about 0.2%); good corrosion resistance, radiation resistance, high Wear resistance, and excellent processing ability in the supercooled liquid phase region, etc. [0003] The ability to prepare and form metallic glasses has always been a hot topic of research and concern for researchers and engineers. For bulk metallic glasses, systems with different compositions all have a certain critical dec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C45/00C22C1/02
Inventor 于海滨余鹏白海洋赵德乾汪卫华
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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