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Al-Ta intermediate alloy and preparation method and application thereof

An intermediate alloy, al-ta technology, applied in the field of metal alloy materials, to achieve the effects of uniform distribution, small refinement, and uniform grain refinement efficiency

Inactive Publication Date: 2015-12-09
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the TiAl3 compound is easy to grow during the preparation of the Al-Ti master alloy, it is difficult to prepare such an Al-Ti master alloy.

Method used

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  • Al-Ta intermediate alloy and preparation method and application thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0034] Al-17Ta master alloy, its chemical composition is composed of the following components by mass percentage: Ta, 17%, cerium-rich mixed rare earth 0.2%, and the rest is Al. Ta elements are mainly polyhedral or spherical TaAl 3 The compound particles are embedded in the aluminum matrix, with a body-centered tetragonal crystal structure, and the particle size is mainly in the range of 0.1-3 microns. The microstructure is shown in figure 1 , 2 , 3 shown. The structure of the Al-10Ti master alloy produced by a domestic company is shown in Figure 7 , which contains TiA 3 The particle size is mainly tens of microns.

[0035] The above Al-17Ta master alloy has a significant grain refinement effect on industrial pure aluminum: the average grain diameter of industrial pure aluminum without any refiner is about 4mm ( Figure 4 ), the average grain diameter of industrial pure aluminum after adding the above-mentioned Al-17Ta master alloy with an atomic ratio of 0.015% of Ta e...

Embodiment 2

[0042] Al-10Ta master alloy, its chemical composition is composed of the following components by mass percentage: Ta, 10%, mixed rare earth 0.3%, and the rest is Al. The Al-10Ta master alloy is compared with the Al-17Ta master alloy in Example 1, except TaAl 3 Except for the reduction in the number of compound particles, the rest of the structural features are the same, and the grain refinement effect on pure aluminum is similar (at the same addition of Ta element).

[0043] The process of preparing 2000 grams of the above-mentioned Al-10Ta master alloy is as follows:

[0044] (1) Weigh 1845 grams of raw material pure aluminum, 6 grams of cerium-rich mixed rare earth, K 2 TaF 7 433.8 grams;

[0045] (2) Melting pure aluminum to the range of 690-730°C in a melting furnace, adding cerium-rich mixed rare earth and stirring the melt after melting to make the composition uniform;

[0046] (3) will K ２ TaF 7 5 batches are added to the above aluminum melt for reaction, each bat...

Embodiment 3

[0049] Al-6Ta master alloy, its chemical composition is composed of the following components by mass percentage: Ta6%, mixed rare earth elements 0.05%, and the rest is Al. The Al-6Ta master alloy is compared with the Al-17Ta master alloy in Example 1, except TaAl 3 Except for the reduction in the number of compound particles, the rest of the structural features are the same, and the grain refinement effect on pure aluminum is similar (at the same addition of Ta element).

[0050] The process of preparing 3000 grams of the above-mentioned Al-6Ta master alloy is as follows:

[0051] (1) Weigh 2865 grams of raw material pure aluminum, 1.5 grams of cerium-rich mixed rare earth and K 2 TaF 7 390.42 grams;

[0052] (2) Melt pure aluminum in the melting furnace to the range of 690-730°C, add cerium-rich mixed rare earth and stir the melt after melting to make the composition uniform;

[0053] (3) will K ２ TaF 7 Add to the above aluminum melt in 2 batches for reaction, each batc...

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Abstract

The invention provides Al-Ta intermediate alloy. The Al-Ta intermediate alloy is composed of, by mass, 0.3%-20% of Ta, 0-0.35% of cerium-rich mischmetal, and the balance Al. Meanwhile, the invention provides a preparation method of the Al-Ta intermediate alloy. According to the Al-Ta intermediate alloy prepared with the preparation method, TaAl3 particles are small in size through refining, and distributed in a substrate evenly; a Ta element is distributed evenly after the TaAl3 particles are added to aluminum or aluminum alloy to be refined, so that the various problems caused by the large size of the particles are avoided.

Description

technical field [0001] The invention relates to an aluminum-based master alloy refining agent containing tantalum element for refining α-Al crystal grains in aluminum or aluminum alloy and a preparation method thereof, belonging to the technical field of metal alloy materials. Background technique [0002] Grain refinement of aluminum and its alloys is an important method to improve the structure and surface quality of materials, improve the performance of casting process and mechanical properties. In the production of some cast aluminum alloys and deformed aluminum alloys, the addition of Al-Ti master alloys to the melt is often used for grain refinement. [0003] Ti element is mainly TiAl in Al-Ti master alloy 3 Compound particles exist. TiAl contained in common commercial Al-Ti master alloys currently on the market 3 The particles are polyhedral blocks or strips, and the size is generally tens of microns or even more than 100 microns. After such an Al-Ti master alloy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C1/02
Inventor 王振卿李令品左敏杨中喜赵德刚
Owner UNIV OF JINAN