Preparation method of superfine crystal inoculating agent for aluminum alloy grain refinement

A technology of grain refinement and ultra-fine grain, which is applied in the field of aluminum-based alloys, can solve the problems of deterioration of aluminum alloy mechanical properties, easy aggregation and precipitation of particles, and decline of refinement effect, so as to improve the refinement effect, prevent aggregation and precipitation, The effect of increasing the moisture content

Active Publication Date: 2012-11-21
HEBEI UNIV OF TECH
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AI Technical Summary

Problems solved by technology

Al-5Ti-1B master alloy has been widely used as a refiner in the aluminum industry. This refiner has a good refinement effect, but it also has many defects: first, TiB 2 Particles are easy to aggregate and precipitate in the aluminum melt, so that the refining effect gradually declines over time (Limmaneevichitr C, Eidhed W. Mater Sci Eng A 2003; A349:197-206; Whitehead AJ, Danilak SA, Granger DA, Huglen R (Ed.), Light Metals, The Minerals, Metals & Materials Society, Warrendale, PA, 1997)
However, in the master alloys prepared by the above-mentioned processes, the nucleation particles TiAl 3 The size is about ten to tens of microns, and TiAl 3 It is mainly distributed on the aluminum substrate in the form of irregular blocks and needles
For acicular TiAl 3 As far as it is concerned, once it precipitates on the grain boundary, the matrix will be severely split, resulting in a sharp deterioration of the mechanical properties of the aluminum alloy.
In addition, TiAl 3 Belongs to the brittle phase, a large amount of massive TiAl 3 Distributed on the substrate, it will make the material brittle, which is also not conducive to the improvement of mechanical properties

Method used

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  • Preparation method of superfine crystal inoculating agent for aluminum alloy grain refinement
  • Preparation method of superfine crystal inoculating agent for aluminum alloy grain refinement
  • Preparation method of superfine crystal inoculating agent for aluminum alloy grain refinement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Step One, Ingredients

[0037] According to the set composition ratio of 5%Ti, 1%B, 1%Ce, 0.05%La and the rest as Al, weigh the required amount of domestic Φ9.5mm rod-shaped Al-5Ti-1B master alloy and the domestic composition is The lanthanum-cerium alloy of 90%Ce and 10%La carries out batching, and above-mentioned percentage is percentage by weight;

[0038] The second step, vacuum smelting to produce bulk Al-5Ti-1B-1Re master alloy

[0039] Put all the ingredients in the first step into the vacuum electric arc furnace, and evacuate to a vacuum degree of 1.26×10 -2 Pa, be heated to the temperature that makes all batching all melt, pour into steel mold after being incubated for 5 minutes, make the Al-5Ti-1B-1Re master alloy of block shape;

[0040] The third step, rapid solidification treatment to prepare ultra-fine grain inoculants for aluminum alloy grain refinement

[0041] Put the massive Al-5Ti-1B-1Re master alloy obtained in the second step into a vacuum rapid ...

Embodiment 2

[0046] Step One, Ingredients

[0047] According to the set composition ratio of 5.2%Ti, 1.02%B, 1.1%Ce, 0.12%La and the rest as Al, weigh the domestic Φ9.5mm rod-shaped Al-5Ti-1B master alloy and the domestic composition as 90%Ce and The lanthanum-cerium alloy of 10%La carries out batching, and above-mentioned percentage is percentage by weight;

[0048] The second step, vacuum smelting to produce bulk Al-5Ti-1B-1Re master alloy

[0049] Put all the ingredients in the first step into the vacuum electric arc furnace, and evacuate to a vacuum degree of 1.26×10 -2 Pa, be heated to the temperature that makes all batching all melt, be poured into steel mold after the insulation 6 minutes, make the Al-5Ti-1B-1Re master alloy of block shape;

[0050] The third step, rapid solidification treatment to prepare ultra-fine grain inoculants for aluminum alloy grain refinement

[0051] Put the massive Al-5Ti-1B-1Re master alloy obtained in the second step into a vacuum rapid quenching fu...

Embodiment 3

[0053] Step One, Ingredients

[0054] According to the set composition ratio of 5.4%Ti, 1.04%B, 1.2%Ce, 0.2%La and the rest as Al, weigh the domestic Φ9.5mm rod-shaped Al-5Ti-1B master alloy and the domestic composition as 90%Ce and The lanthanum-cerium alloy of 10%La carries out batching, and above-mentioned percentage is percentage by weight;

[0055] The second step, vacuum smelting to produce bulk Al-5Ti-1B-1Re master alloy

[0056] Put all the ingredients in the first step into the vacuum electric arc furnace, and evacuate to a vacuum degree of 1.26×10 -2 Pa, be heated to the temperature that makes all batching all melt, be poured into steel mold after being incubated for 8 minutes, make the Al-5Ti-1B-1Re master alloy of block shape;

[0057] The third step, rapid solidification treatment to prepare ultra-fine grain inoculants for aluminum alloy grain refinement

[0058] Put the massive Al-5Ti-1B-1Re master alloy obtained in the second step into a vacuum rapid quenchin...

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Abstract

The invention provides a preparation method of a superfine crystal inoculating agent for aluminum alloy grain refinement and relates to aluminum-based alloy and is a method for preparing nano-crystalline Al-Ti-B-Re thin-strip intermediate alloy by a rapid solidification technology of metal, wherein the method comprises steps as follows: proportioning 5-5.4% of Ti, 1-1.04% of B, 1-1.2% of Ce, 0.05-0.2% of La and the balance of Al according to determined ingredients; weighing raw materials Al-5Ti-1B intermediate alloy and lanthanum cerium alloy to proportion the materials; melting in vacuum to obtain blocky Al-5Ti-1B-1Re intermediate alloy; carrying out rapid solidification to obtain the superfine crystal inoculating agent for the aluminum alloy grain refinement, wherein the superfine crystal inoculating agent is the nano-crystalline Al-5Ti-1B-1Re intermediate alloy. With the adoption of the method provided by the invention, adverse impact of needlelike TiAl3 on the matrix structure is eliminated, nucleating particles TiAl3 with thinner size and more dispersed distribution are obtained, and superfine nucleating particles are realized.

Description

technical field [0001] The technical solution of the invention relates to an aluminum-based alloy, in particular to a method for preparing an ultra-fine grain inoculant used for grain refinement of an aluminum alloy. Background technique [0002] At present, grain refinement is one of the important means to obtain aluminum alloys with excellent properties. Among all grain refinement means, adding grain refiner to aluminum melt is recognized as the simplest and most effective. Al-5Ti-1B master alloy has been widely used as a refiner in the aluminum industry. This refiner has a good refinement effect, but it also has many defects: first, TiB 2 Particles are easy to aggregate and precipitate in the aluminum melt, so that the refining effect gradually declines over time (Limmaneevichitr C, Eidhed W. Mater Sci Eng A 2003; A349:197-206; Whitehead AJ, Danilak SA, Granger DA, Huglen R (Ed.), Light Metals, The Minerals, Metals & Materials Society, Warrendale, PA, 1997). In additio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C1/03C22C1/02C22F1/04
Inventor 崔春翔王奎王倩刘双进戚玉敏
Owner HEBEI UNIV OF TECH
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