Holmium base amorphous alloy and its preparation method

An amorphous alloy and holmium-based technology, which is applied in the field of holmium-based bulk amorphous alloy and its preparation, can solve the problems of limited application range, low glass transition and crystallization temperature, and reduced critical cooling rate, and achieve the ability to inhibit crystallization Strong, high crystallization temperature, high glass transition temperature effect

Inactive Publication Date: 2008-04-02
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, we hope that through proper alloy composition design, the critical cooling rate required to inhibit the initiation of crystallization can be reduced, so as to obtain larger-sized bulk rare earth-based amorphous alloys to meet the needs of industrial applications; on the other hand, due to the The found light rare earth-based bulk amorphous alloys have low glass transition and crystallization temperatures, which limits their application range, while heavy rare earth elements have relatively higher melting points and moduli, we expect to find materials with higher glass transition and Heavy rare earth bulk amorphous alloy or metallic glass at crystallization temperature, expanding its application range

Method used

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  • Holmium base amorphous alloy and its preparation method
  • Holmium base amorphous alloy and its preparation method
  • Holmium base amorphous alloy and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1, Ho 40 Y 16 Al 24 co 20 Preparation of holmium-based bulk amorphous alloys.

[0027] After the four components of Ho, Y, Al and Co with a raw material purity of more than 99.9% (weight percent) are prepared in a molar ratio of 40:16:24:20, they are mixed in an electric arc furnace with an argon atmosphere adsorbed by titanium Ho-Y-Al-Co quaternary alloy master alloy ingot is obtained after cooling; then the ingot is re-melted by conventional metal mold casting method, and the mother alloy The alloy melt is sucked into the water-cooled copper mold, and the composition can be obtained as Ho 40 Y 16 Ali 24 co 20 , a bulk amorphous alloy with a diameter of 5mm. Its physical photo is shown in Figure 6a.

[0028] Its thermal analysis (DSC and DTA) is as shown in Figure 2, can find out from the figure that the glass transition temperature (T g ), crystallization onset temperature (T x ), melting onset temperature (T m ) and the width of the liquid phase i...

Embodiment 2

[0029] Example 2, Ho 39 Y 16 Al 22 co 23 Preparation of Holmium-based Bulk Amorphous Alloy

[0030]After the purity of the raw material is more than 99.9% (weight percent), the four components of Ho, Y, Al and Co are prepared in a molar ratio of 39:16:22:23, and the titanium is adsorbed in an electric arc furnace with an argon atmosphere. Mix evenly and smelt, after cooling, obtain the master alloy ingot of Ho-Y-Al-Co quaternary alloy; then use the conventional metal mold casting method to remelt the ingot, and use the suction casting device in the electric arc furnace The master alloy melt is sucked into the water-cooled copper mold, and the composition can be obtained as Ho 39 Y 16 Al 22 co 23 , a bulk amorphous alloy with a diameter of 5 mm.

[0031] Its X-ray diffraction (XRD) is shown in Figure 1, it can be seen that the alloy is a complete amorphous alloy.

[0032] Its thermal analysis (DSC and DTA) is as shown in Figure 3, can find out its glass transition temp...

Embodiment 3

[0033] Example 3, Ho 39 Y 12 Al 24 co 20 Zr 5 Preparation of Holmium-based Bulk Amorphous Alloy

[0034] After the five components of Ho, Y, Al, Co and Zr with a purity of more than 99.9% (weight percent) are prepared in a molar ratio of 39:12:24:20:5, the argon atmosphere adsorbed by titanium Mix and melt in an electric arc furnace, and obtain a master alloy ingot of Ho-Y-Al-Co-Zr five-element 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 to obtain a 3mm holmium-based bulk amorphous alloy Ho 39 Y 12 Al 24 co 20 Zr 5 .

[0035] Its X-ray diffraction (XRD) is shown in Figure 1, it can be seen that the alloy is a complete amorphous alloy.

[0036] Its thermal analysis (DSC and DTA) is as shown in Figure 4, as can be seen from the figure: its glass transition temperature (T g ), crystallization onset temperature (T x ), meltin...

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Abstract

The invention relates to a holmium radical bulk non-crystal body alloy that the expression is HoaMbAlcCodTe, and 30 greater than or equal to a greater than or equal to 56, 0 greater than or equal to b greater than or equal to 26, 22 greater than or equal to c greater than or equal to 25, 20 greater than or equal to d greater than or equal to 23, 0 greater than or equal to e greater than or equal to 25, and a+b+c+d+e=100, M is Zr or / and Y, element T is Fe, Ni, Nb, Pd, Mo, Hf, Ta, or rare earth Ce, Tb, Dy, Gd, Er, and Sm. The alloy is made up from mixing the elements with purity over 99.9wt% according to the ratio, and taking multi times melting to gain mother alloy ingot bar, and re-melting the mother alloy, using casting adsorbing device in arc furnace to adsorb the melt into water cooledcopper mould. The invention has low critical cooling speed, strong anti oxygen ability, and strong anti crystallizing ability. It is easy to make and low cost, and has high thermal stability.

Description

technical field [0001] The invention relates to the field of amorphous alloys or metallic glasses, in particular to a holmium-based bulk amorphous alloy and a preparation method thereof. Background technique [0002] Amorphous alloys or metallic glasses are usually formed by solidification of metal alloys cooled from the liquid state to below the glass transition temperature, before nucleation and crystallization. However, limited by the ability of metal alloys to form amorphous crystals, a high enough cooling rate is necessary to obtain large-sized bulk amorphous crystals. High cooling rates can be obtained by spraying molten metal or alloy onto a conductive substrate that conducts heat very well, but only thin strips or powders can be obtained with this method. [0003] In the past ten years, through the optimization design of alloy composition and the improvement of preparation technology, people broke through the limitation of high-speed cooling conditions and found a s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C45/00C22C28/00C22C1/03B22D7/00B22D18/00
Inventor 罗强赵德乾潘明祥汪卫华
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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