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A method of controlling the tensile strength and plasticity of al-la alloy

A tensile strength and alloy technology, applied in the field of adjusting the tensile strength and plasticity of Al-La alloys, can solve the problems of difficult drawing, easy wire breakage, poor plasticity of Al-La alloys, etc. Mechanical properties, the effect of improving yield

Active Publication Date: 2018-07-06
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the Al-La alloy produced by the existing production process has poor plasticity, is not easy to draw, and there are a large number of brittle rare earth metal phases in the alloy, which is very prone to broken wires during the drawing process, which seriously affects the Al-La alloy. Insufficient production of alloy wires, providing a method to regulate the tensile strength and plasticity of Al-La alloys, through the control of composition, solidification structure and working temperature, comprehensively improve the mechanical properties of Al-La alloys, which is beneficial to Al-La alloys Wire production, and then promote the development and application of Al-La alloy wire

Method used

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  • A method of controlling the tensile strength and plasticity of al-la alloy
  • A method of controlling the tensile strength and plasticity of al-la alloy
  • A method of controlling the tensile strength and plasticity of al-la alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Use high-purity metal Al block with a purity of 99.99% and high-purity metal La with a purity of 99.9% as raw materials, and put them into the vacuum induction furnace that has completed the furnace cleaning operation according to the mass ratio of metal Al to metal La at a ratio of 8.1:1 , evacuated to a vacuum of 2Pa.

[0018] Raise the temperature of the vacuum induction furnace to the melting temperature of 1000°C. After reaching the melting temperature, the electromagnetic stirring process is used to stir for 3 minutes to completely melt the metal La and fully dissolve the metal Al and La.

[0019] After the stirring is sufficient, pour the Al-La alloy melt into the graphite crucible prepared in advance in the vacuum induction furnace. After completion, it is naturally cooled to room temperature to obtain an Al-La alloy ingot.

[0020] After component detection, the La content of the prepared Al-La alloy is 10wt% (Al-10La alloy), which meets the component requirem...

Embodiment 2

[0026] The same implementation process as in Example 1 was adopted, except that the pull-out test was carried out at 250° C., and the others remained unchanged.

[0027] attached by Figure 4 and 5 It can be seen that the drawing test at 250°C shows that the reduction of area of ​​Al-10La alloy is 45%, the plasticity is further improved, and the tensile strength is 80MPa. The plasticity and tensile strength are still significantly better than Al-15La and Al-20La alloys.

Embodiment 3

[0029] The same implementation process as in Example 1 was adopted, except that the pull-out test was carried out at 300° C., and the others remained unchanged.

[0030] attached by figure 2 and 3 It can be seen that the drawing test at 300 ° C shows that the reduction of area of ​​Al-10La alloy is 60%, which reflects high plasticity, and the tensile strength is 65MPa. The plasticity and tensile strength are still significantly better than Al-15La and Al-20La alloys.

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Abstract

The invention relates to a method for regulating and controlling the tensile strength and plasticity of Al-La alloy and belongs to the technical field of rare earth alloy. According to the method, the ratio of metal Al to metal La is controlled, and after the metal Al and the metal La are molten in a smelting furnace at a predetermined smelting temperature, the content of the La in the Al-La alloy is 8-11wt%; the metal Al and the metal La are mutually dissolved through stirring, so that the solidification structure of the cooled Al-La alloy is an alpha-Al+Al11La3 eutectic phase and a primary alpha-Al phase, and the content of the primary alpha-Al phase is 5-30%; and when drawing is conducted on the Al-La alloy, the drawing temperature is controlled to be 200-300 DEG C. Through control over the components, the solidification structure and the working temperature, the mechanical properties of the Al-La alloy are comprehensively improved, production of Al-La alloy wires is facilitated, and thus development, application and popularization of the Al-La alloy wires are facilitated

Description

technical field [0001] The invention relates to the technical field of rare earth alloys, in particular to a method for regulating the tensile strength and plasticity of Al-La alloys. Background technique [0002] Rare earth La is a commonly used additive in iron and steel materials, which has the functions of refining solidified structure, purifying molten steel, and improving the oxidation resistance of materials. However, during the smelting and adding process, the rare earth La is easily oxidized and burned under high temperature conditions, resulting in a very low actual yield. Due to the strong oxidation resistance of Al, if the method of adding Al and La to the steel at the same time can effectively reduce the oxidation burning loss of La. Especially for high aluminum steel, this method not only adds alloy raw materials, but also reduces the burning loss of rare earth La. Therefore, the industry adopts the method of adding aluminum-based binary rare earth alloy Al-L...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/00C22C1/02C22F1/04
CPCC22C1/026C22C21/00C22F1/04
Inventor 刘建华何杨邓振强闫柏军
Owner UNIV OF SCI & TECH BEIJING