Preparation method of ultra-fine-crystal high-toughness heat-resistant aluminum alloy lead

Abstract

The invention relates to a preparation method of an ultra-fine-crystal high-toughness heat-resistant aluminum alloy lead. The preparation method comprises the following steps: (1) performing proportioning, wherein the aluminum alloy lead consists of the following components in parts by weight: 100 parts of industrial pure aluminum, 0.7 part of aluminum-zirconium alloy, 0.4 part of aluminum-copperalloy, 0.4 part of aluminum-erbium alloy, 0.0015 part of a refiner Al-5Ti-B, 0.06 part of a modifier Sr and 0.5 part of a refining agent hexachloroethane; (2) performing smelting: adding pure aluminuminto a coreless medium-frequency induction furnace, increasing the furnace temperature to 740 DEG C, starting ultrasonic vibration for 20 seconds when the temperature reaches 720 DEG C, adding intermediate alloy, a modifying agent and a refining agent by a bell pressing method after the metal is completely melted, wherein electromagnetic stirring is carried out during the adding process, and thenperforming refining and slagging off; and (3) casting prepared alloy liquid into ingots, then performing multi-directional forging on the alloy ingots, and performing homogenization treatment, rolling, stress removal annealing, low-temperature continuous equal channel angular processing (ECAP), precipitation strengthening, drawing and twisting.

Description

technical field [0001] The invention relates to the preparation technology of an aluminum alloy wire, in particular to the preparation technology of an ultrafine-grained, high-strength, high-strength, heat-resistant aluminum alloy wire. Background technique [0002] Chinese patent 201710083834.7 discloses a high-hardness aluminum alloy wire. The main process is to mix and smelt various metals, then cast and roll, which can increase the hardness of the material, but high alloying has a greater impact on the electrical conductivity of the material; Chinese patent 201810225926.9 discloses an aluminum alloy wire material. The main method is to add metal oxides such as magnesium oxide, zinc oxide, aluminum oxide, etc. to enhance the wear resistance and high temperature resistance of the aluminum alloy wire. Not only is it more difficult to add metal oxides, but also because metal oxides are not conductive, it will also seriously affect the conductivity of the material. [0003] ...

AI Technical Summary

Problems solved by technology

[0002] Chinese patent 201710083834.7 discloses a high-hardness aluminum alloy wire. The main process is to mix and smelt various metals, then cast and roll, which can increase the hardness of the material, but high alloying has a greater impact on the electrical conductivity of the material; Chinese patent 201810225926.9 discloses an aluminum alloy wire material. The main method is to add metal oxides such as magnesium oxide, zinc oxide, aluminum oxide, etc. to enhance the wear resistance and high temperature resistance of the aluminum alloy wire. Not only is it more difficult to add metal oxides, but also because metal oxides are not conductive, it will also seriously affect the conductivity of the material

[0003] Chinese patent 201710266987.5 discloses a high-strength graphene rare earth aluminum alloy wire. In addition to graphene and aluminum matrix, as many as 14 alloy elements are added. Because graphene is not only easy to oxidize when added to molten metal, but also difficult to dissolve In alloys, the requirements for smelting equipment and smelting process are extremely high, but this invention does not explain how graphene is added to molten aluminum, and does not explain the processing process after smelting

[0004] Chinese patent 201610179825.3 discloses a method for preparing a high-conductivity and heat-resistant aluminum alloy conductor. The molten aluminum in this method is directly solidified in a launder, which not only easily mixes impurities during the pouring process, but also cannot guarantee the uniformity and density of the material. Therefore, the material prepared by this method cannot guarantee good performance

In practical applications, pure aluminum wires are the most. In addition, this method uses resistance furnace melting, which will cause uneven temperature rise, high impurity content in the alloy, and it is difficult to ensure the purity of the alloy.