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Cerium-base bulk amorphous alloys and method for preparation thereof

An amorphous alloy and bulk technology, applied in the alloy field, can solve the problems of low oxygen resistance and high preparation cost, and achieve the effect of low elastic performance and low cost

Inactive Publication Date: 2008-03-26
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

[0011] The purpose of the present invention is to overcome the defects that the existing amorphous alloys are mostly based on high-purity noble metal elements, have low oxidation resistance and high preparation cost, so as to provide an amorphous alloy that can be prepared only with industrial purity and has high oxidation resistance. , In my country, the rare earth element cerium, which is rich in reserves and very cheap, is a metal-based cerium-based bulk amorphous alloy

Method used

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  • Cerium-base bulk amorphous alloys and method for preparation thereof
  • Cerium-base bulk amorphous alloys and method for preparation thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Example 1, Ce 60 al 10 Ni 10 Cu 20 Preparation of Bulk Amorphous Alloy

[0039] Use Ce, Al, Ni and Cu with a purity of more than 99.5% and a molar ratio of 60:10:10:20 to prepare a cerium-based bulk amorphous alloy. First, the four components are prepared in proportion and then adsorbed on titanium. Melting in an electric arc furnace with an argon atmosphere, mixing evenly, and cooling to obtain a master alloy ingot of a Ce-Al-Ni-Cu quaternary alloy; then using a conventional metal mold casting method to remelt this master alloy alloy ingot, Using the suction casting device in the electric arc furnace, the master alloy melt is sucked into the water-cooled copper mold, and the composition is Ce 60 al 10 Ni 10 Cu 20 , a bulk amorphous alloy with a diameter of 1 mm.

[0040] X-ray diffraction (XRD) as shown in Figure 1 proves that the alloy is completely amorphous. Thermal analysis (DSC) figure shown in Figure 3, its glass transition temperature (T g ), crystalli...

Embodiment 2

[0041] Example 2, Ce 70 al 10 Ni 10 Cu 10 Preparation of Bulk Amorphous Alloy

[0042] According to the method for embodiment 1, prepare bulk amorphous alloy Ce 70 al 10 Ni 10 Cu10 . The glass transition temperature of the alloy is lowered (359K), and the supercooling range is narrowed (18K), but the glass forming ability is lower than that of Ce in Example 1. 60 al 10 Ni 10 Cu 20 The bulk amorphous alloy is improved, and an amorphous rod with a diameter of 3 mm can be obtained, as shown in Figure 4. Ultrasonic tests prove that the amorphous alloy is a "soft" metallic glass, and its bulk modulus (K), shear modulus (G) and Young's modulus (E) are 27GPa, 11.5GPa and 30.3GPa ( See Table 1. These modulus values ​​are similar to the corresponding modulus values ​​of amorphous carbon and relatively close to those of organic polymers.

Embodiment 3～23

[0044] Prepare various proportioning magnesium-based bulk amorphous alloys according to the method of Example 1, its X-ray diffraction (XRD) is as shown in Figure 1 and Figure 2, and thermal analysis (DSC) figure is as shown in Figure 3, all alloys The composition and thermal properties of the materials are listed in Table 1.

[0045] The cerium required by the cerium-based bulk amorphous alloy provided by the invention is an industrial raw material with a purity of 99.5%. Therefore, the cost of the cerium-based bulk amorphous alloy is lower than that of other precious metals. Moreover, my country is a big rare earth country, and cerium resources are very rich, so this is a bulk amorphous system that is very suitable for the characteristics of my country's resources. Because cerium has strong metal activity, it can absorb a large amount of oxygen at room temperature, so the metal has good anti-oxidation performance. Even if it absorbs a lot of oxygen during the preparation pro...

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Abstract

The invention relates to a sort of cerium-based block amorphous alloy, which is formed primarily from the cerium and contains at least 50% amorphous phase percentage by volume, and can be represented by the formula: CeaAlbNicCudMe, wherein 50<=a<=80, 5<=b<=20, 5<=c<=20, 5<=d<=20, 0<=e<=10, and a+b+c+d+e=100, and said transition metal elements M is Sc, Nb, Ti, V, Cr, Mn, Fe, Co, Y, Zr, Mo, La, Pr , Nd or Hf. The preparation of the alloy is in the electric arc furnace of argon atmosphere absorbed with the titanium and the steps is: smelting each group according to needed atomic matching, mixing them evenly, and getting the key metal ingoting after cooling, smelting the ingoting again by normal chill casting method, inhaling the flux to the water-cooled copper mould through the suction apparatus in the furnace, then getting the alloy.

Description

technical field [0001] The invention relates to an alloy, in particular to a cerium-based bulk amorphous alloy with cerium as the main component and containing at least 50 volume percent 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 rotating copper roll to obtain a thin strip, or cast into a cold substrate to ob...

Claims

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Application Information

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