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Samarium based amorphous alloy and preparation method thereof

An amorphous alloy and master alloy ingot casting technology, which is applied in the field of samarium-based bulk amorphous alloys, can solve the problems of limited application range, low glass transition and crystallization temperature, and reduced critical cooling rate, and achieves strong crystallization inhibition ability. , the effect of high crystallization temperature and high glass transition temperature

Inactive Publication Date: 2008-07-02
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

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, which can meet the needs of industrial applications; on the other hand, due to the discovery The glass transition and crystallization temperature of the light rare earth-based bulk amorphous is low, so its application range is limited, while the heavy rare earth elements have relatively higher melting point and modulus, we expect to find high glass transition and crystallization High temperature heavy rare earth bulk amorphous or metallic glass, expanding its range of applications

Method used

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  • Samarium based amorphous alloy and preparation method thereof
  • Samarium based amorphous alloy and preparation method thereof
  • Samarium based amorphous alloy and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] Embodiment 1, preparation Sm 40 Y 15 al 25 co 20 Samarium-based bulk amorphous alloy

[0030] The purity of the raw material is 99.9% (weight percent) Sm, Y, Al and Co four components in a molar ratio of 40:15:25:20, mixed in an electric arc furnace with an argon atmosphere adsorbed by titanium Uniform and smelting, after cooling, the master alloy ingot of Sm-Y-Al-Co quaternary alloy is obtained; The alloy melt is sucked into the water-cooled copper mold, and the composition can be obtained as Sm 40 Y 15 al 25 co 20 , a bulk amorphous alloy with a diameter of 3 mm.

[0031] From such as figure 1 The X-ray diffraction (XRD) shown can prove that the alloy is a completely amorphous alloy. figure 2 for Sm 40 Y 15 al 25 co 20 Thermal analysis (DSC and DTA) diagrams of samarium-based bulk amorphous alloys, as can be seen from the figure: its glass transition temperature (T g ), crystallization onset temperature (T x ), melting onset temperature (T m ) and th...

Embodiment 2

[0032] Embodiment 2, preparation Sm 40 Nd 15 al 25 co 20 Samarium-based bulk amorphous alloy

[0033] After the purity of the raw material is more than 99.9% (weight percent), the four components of Sm, Nd, Al and Co are prepared in a molar ratio of 40:15:25:20, and the titanium is adsorbed in an electric arc furnace with an argon atmosphere. Mix evenly and smelt, and obtain the master alloy ingot of Sm-Nd-Al-Co quaternary alloy after cooling; then use the conventional metal mold casting method to remelt the ingot, and use the suction casting device in the electric arc furnace to The master alloy melt is sucked into the water-cooled copper mold, and the composition can be obtained as Sm 40 Nd 15 al 25 co 20 , a bulk amorphous alloy with a diameter of 2 mm.

[0034] From such as figure 1 The X-ray diffraction (XRD) shown can prove that the alloy is a completely amorphous alloy. image 3 for Sm 40 Nd 15 al 25 co 20 Thermal analysis (DSC and DTA) diagrams of samariu...

Embodiment 3

[0035] Embodiment 3, preparation Sm 45 Nd 10 al 25 co 20 Samarium-based bulk amorphous alloy

[0036] After the purity of the raw material is more than 99.9% (weight percent), the four components of Sm, Nd, Al and Co are prepared in a molar ratio of 45:10:25:20, and the titanium is adsorbed in an electric arc furnace with an argon atmosphere. Mix evenly and smelt, and obtain the master alloy ingot of Sm-Nd-Al-Co quaternary alloy after cooling; then use the conventional metal mold casting method to remelt the ingot, and use the suction casting device in the electric arc furnace to The master alloy melt is sucked into the water-cooled copper mold, and a 2mm samarium-based bulk amorphous alloy Sm can be obtained 45 Nd 10 al 25 co 20 .

[0037] From such as figure 1 The X-ray diffraction (XRD) shown can prove that the alloy is a completely amorphous alloy. Figure 4 for Sm 45 Nd 10 al 25 co 20 Thermal analysis (DSC and DTA) diagrams of samarium-based bulk amorphous a...

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Abstract

The invention discloses a samarium-based amorphous alloy, which is based on samarium as main component with SmaMbAlcCod as component, wherein metal element M is Y, Sc or Nd (40<=a<=55,0<=b<=16,22<=c<=25,20<=d<=22, a+b+c+d=100); the alloy possesses higher glass forming ability and heat stability with glass transition temperature at 541-584K and crystallizing temperature at 590-652K, whose breadth of cool liquid phase area is 49-89K; the alloy is easy to form large-size amorphous alloy with each dimension not less than 1mm, whose critical diameter is not less than 1mm.

Description

technical field [0001] The invention belongs to the field of amorphous alloys or metallic glasses, and in particular relates to a samarium-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 ...

Claims

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Application Information

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