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A method for improving the mechanical properties of ce‑ga‑cu bulk amorphous alloys

An amorphous alloy, ce-ga-cu technology, which is applied in the field of amorphous alloys, can solve the problems of temperature increase in the shear zone region, fracture of amorphous alloys, etc., and achieve excellent vitrification forming ability and improve mechanical properties. Effect

Active Publication Date: 2017-05-17
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although Ce-based amorphous alloys have a lower glass transition temperature, like all systems of amorphous alloys, Ce-based amorphous alloys have no crystalline material during deformation at high strain rates or at room temperature. In the presence of traditional plastic deformation mechanisms such as dislocations and slips in the bulk amorphous alloy, the bulk amorphous alloy undergoes macroscopic plastic deformation through highly localized shear, which causes the temperature in the shear zone region to rise sharply, eventually causing the disaster of the amorphous alloy sexual break

Method used

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  • A method for improving the mechanical properties of ce‑ga‑cu bulk amorphous alloys
  • A method for improving the mechanical properties of ce‑ga‑cu bulk amorphous alloys
  • A method for improving the mechanical properties of ce‑ga‑cu bulk amorphous alloys

Examples

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Effect test

Embodiment 1

[0026] Example 1: Ce 69 Ga 8 Cu 22 Fe 1 Preparation of Bulk Amorphous Alloy

[0027] Step 1: Use Ce with a raw material purity of 98.7-98.9wt.% and Ga, Cu and Fe with a purity of not less than 99.9wt.% to prepare Ce 69 Ga 8 Cu 22 Fe 1 The alloy is then smelted in a vacuum electric arc furnace under the protection of a high-purity Ar atmosphere. In order to ensure the uniform composition of the master alloy ingot, the master alloy is stirred in the furnace with electromagnetic stirring, and the master alloy is repeatedly smelted for more than 4 times. After cooling, the master alloy ingot is obtained. ingot.

[0028] Step 2: Re-melt the master alloy ingot obtained in step 1, and use the vacuum suction casting device to suction-cast the master alloy into 6mm and 8mm cylindrical water-cooled copper molds respectively to obtain 6mm and 8mm Ce 69 Ga 8 Cu 22 Fe 1 Alloy bars.

[0029] Step 3: Characterize the structure of these alloys by X-ray diffraction, the results are...

Embodiment 2

[0033] Example 2: Ce 68 Ga 8 Cu 22 Fe 2 Preparation of Bulk Amorphous Alloy

[0034]Step 1: Use Ce with a raw material purity of 98.7-98.9wt.% and Ga, Cu and Fe with a purity of not less than 99.9wt.% to prepare Ce 68 Ga 8 Cu 22 Fe 2 The alloy is then smelted in a vacuum electric arc furnace under the protection of a high-purity Ar atmosphere. In order to ensure the uniform composition of the master alloy ingot, the master alloy is stirred in the furnace with electromagnetic stirring, and the master alloy is repeatedly smelted for more than 4 times. After cooling, the master alloy ingot is obtained. ingot.

[0035] Step 2: Re-melt the master alloy ingot obtained in step 1, and use the vacuum suction casting device to suction-cast the master alloy into 6mm and 8mm cylindrical water-cooled copper molds respectively to obtain 6mm and 8mm Ce 68 Ga 8 Cu 22 Fe 2 Alloy bars.

[0036] Step 3: Characterize the structure of these alloys by X-ray diffraction, the results are ...

Embodiment 3

[0040] Example 3: Ce 67 Ga 8 Cu 22 Fe 3 Preparation of Bulk Amorphous Alloy

[0041] Step 1: Use Ce with a raw material purity of 98.7-98.9wt.% and Ga, Cu and Fe with a purity of not less than 99.9wt.% to prepare Ce 67 Ga 8 Cu 22 Fe 3 The alloy is then smelted in a vacuum electric arc furnace under the protection of a high-purity Ar atmosphere. In order to ensure the uniform composition of the master alloy ingot, the master alloy is stirred in the furnace with electromagnetic stirring, and the master alloy is repeatedly smelted for more than 4 times. After cooling, the master alloy ingot is obtained. ingot.

[0042] Step 2: Re-melt the master alloy ingot obtained in step 1, and use the vacuum suction casting device to suction-cast the master alloy into 6mm and 8mm cylindrical water-cooled copper molds respectively to obtain 6mm and 8mm Ce 67 Ga 8 Cu 22 Fe 3 Alloy bars.

[0043] Step 3: Characterize the structure of these alloys by X-ray diffraction, the results are...

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Abstract

The invention discloses a method for improving the mechanical property of a Ce-Ga-Cu series bulk amorphous alloy. The method is characterized by comprising the step of adding a microelement Fe into the Ce-Ga-Cu series bulk amorphous alloy to form a Ce-Ga-Cu-Fe series bulk amorphous alloy. The structural formula of the Ce-Ga-Cu-Fe series bulk amorphous alloy is Ce70-xGa8Cu22Fex, wherein x is 1, 2 or 3. Compared with the corresponding Ce-Ga-Cu series bulk amorphous alloy, the Ce-Ga-Cu-Fe series bulk amorphous alloy has the advantages that the rigidity, fracture strength and plastic deformation capability are improved to a certain extent when the high thermal stability and low glass-transition temperature are kept; when x is 2, a bar made of the Ce-Ga-Cu-Fe series bulk amorphous alloy has not only the highest fracture strength and microhardness, but also about 1% compressive plasticity at room temperature. Therefore, application of a Ce-based amorphous alloy as a functional material is facilitated.

Description

technical field [0001] The invention relates to the field of amorphous alloys, in particular to a method for improving the mechanical properties of Ce-Ga-Cu bulk amorphous alloys by replacing elements. Background technique [0002] Amorphous alloy is a new type of metal material developed in the 1960s. Compared with ordinary crystalline alloys, it is favored because of its superior mechanical properties, magnetic properties, corrosion resistance and biocompatibility. It has attracted extensive attention in the field of materials and is considered to have extremely wide application potential. Since La-Al-Ni amorphous rods were successfully prepared in the 1990s, rare earth-based amorphous alloys have attracted widespread attention in the field of materials because of their importance in scientific research and application. In 2004, Wang Weihua's research group at the Institute of Physics, Chinese Academy of Sciences successfully developed a Ce-Al-Cu bulk amorphous alloy. It...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C45/00C22C1/03
Inventor 张博朱振西吴林
Owner HEFEI UNIV OF TECH
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