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Magnesium base massive amorphous alloy and preparation method thereof

An amorphous alloy and bulk technology, applied in the field of alloys, can solve the problems of low crystallization inhibition ability and small size of amorphous alloy, and achieve the effect of strong glass forming ability and flame retardant performance, easy operation and good flame retardant performance

Inactive Publication Date: 2005-08-17
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to overcome the defects of low crystallization inhibition ability of existing amorphous alloys and the very small size of amorphous alloys obtained by using the prior art, so as to provide a glass-forming ability, strong crystallization inhibition ability, and can be used in very Magnesium-based bulk amorphous alloys with larger sizes prepared at low cooling rates

Method used

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  • Magnesium base massive amorphous alloy and preparation method thereof
  • Magnesium base massive amorphous alloy and preparation method thereof
  • Magnesium base massive amorphous alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1, Mg 65 Cu 25 Tb 10 Preparation of Columnar Bulk Amorphous Alloy

[0036] Use Mg, Cu, and Tb with a purity of 99% and a molar ratio of 65:25:10 to prepare magnesium-based bulk amorphous alloys. First, Cu and Tb are melted in an electric arc furnace in an argon atmosphere adsorbed by titanium, and mixed evenly , after cooling, Cu-Tb binary alloy ingots are obtained; then these Cu-Tb binary alloy ingots are pulverized, put into the quartz glass tube of induction furnace together with Mg block, and vacuumed to 10 -3 After Pa, charge 10 -2 Argon atm, smelting for 5 minutes until the binary alloy ingot is melted, and the main alloy ingot is obtained; finally, the main alloy ingot is re-melted in the air by conventional metal mold casting method, and cast in a copper mold without water cooling , to obtain Mg with a uniform composition and a diameter of 5 mm 65 Cu 25 Tb 10 Columnar bulk amorphous alloy.

[0037] It is worth pointing out that the smelting of...

Embodiment 2～23

[0046] Various ratios of magnesium-based bulk amorphous alloys were prepared according to the method of Example 1, and their composition and thermophysical parameters are listed in Table 2.

[0047]

Example

alloy composition

T g

(K)

T x

(K)

ΔT

(K)

T m

(K)

T l

(K)

T rg

gamma

ΔH x

(J / g)

E.

(GPa)

ρ

(g / cm 3 )

D. c

(mm)

1

Mg 65 Cu 25 Tb 10

414

487

73

713

733

0.581

0.425

67

50

3.80

5

2

Mg 65 Cu 25 Gd 10

406

488

82

716

751

0.567

0.422

75

50

3.79

8

3

Mg 65 Cu 25 Dy 10

422

492

70

735

750

0.574

0.420

50

3.79

3

...

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Abstract

The massive amorphous magnesium-base alloy has Mg as main component and proper amount of RE element, and contains at least 50 vol% of amorphous phase. It has composition of Mg100-b-cMb[R1-aYa]c, where an is 0-1, b is 0-31, and c is 5-21. The preparation process of the alloy includes mixing and smelting M and R components in arc furnace with Ti adsorbed Ar to obtain binary alloy ingot; smelting the crushed binary alloy and Mg lump in an inducing furnace with 0.01 atm Ar filled for 2-5 min to obtain the main alloy ingot; and re-smelting the main alloy ingot in air atmosphere and casting in metal mold to obtain the alloy. The alloy has high glass-forming capacity and high crystallization inhibiting ability, and may have great size obtained at low cooling rate.

Description

technical field [0001] The invention relates to an alloy, in particular to a magnesium-based bulk amorphous alloy which takes magnesium as the main component, adds an appropriate amount of rare earth elements, and contains at least 50% volume percentage of the amorphous phase. Background technique [0002] Typically, metals or alloys crystallize to form crystals when cooled from a liquid state. It has been found that certain metals or alloys cool at a sufficiently fast rate, for example 10 per second 4 ~10 6 In the order of K, it will maintain an extremely viscous state when it is solidified, thereby inhibiting crystallization and obtaining an amorphous metal or alloy. [0003] However, in order to obtain such a high cooling rate, the molten metal or alloy can only be sprayed onto a conductive substrate with very good thermal conductivity, and the size of the obtained amorphous metal or alloy is very small. For example, the molten alloy is sprayed onto a high-speed rotati...

Claims

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Application Information

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IPC IPC(8): C22C45/00
Inventor 郗学奎赵德乾汪卫华潘明祥
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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