Preparation method of super-thick aluminum alloy plate

Abstract

The invention belongs to the technical field of aluminum alloy machining, and relates to a preparation method of a super-thick aluminum alloy plate. The raw materials comprise 0.15-0.7% of Si, 0.1-0.4% of Cu, 0.7-1.2% of Mg, 0.3-0.65% of Zn, 0.02-0.07% of Zr, 0.07-0.2% of Sc, 0.01-0.03% of La, 0.02-0.06% of Pm, 0.025-0.055% of Eu, 0.003-0.01% of Gd, 0.05% or less of single impurity, 0.15 % or lessof impurities in total, and the balance of Al. Zr, Sc and rare earth elements of La, Pm, Eu and Gd are added to alloy components; and an ultrasonic vibration system is adopted for vibration dispersion in the casting process, so that the grain structure is more uniform, the tensile strength and the yield strength are both improved, and meanwhile, the corrosion resistance is also improved.

Description

technical field

[0001] The invention belongs to the technical field of aluminum alloy processing, and relates to a method for preparing an ultra-thick aluminum alloy plate. Background technique

[0002] Aluminum alloy has the advantages of low density, high specific strength, excellent electrical and thermal conductivity, and good machinability. It is widely used in aerospace industry, electric power industry, automobile manufacturing, construction industry, food industry, marine shipbuilding and other fields. However, although the 2-series aluminum alloy has the advantage of super high strength, it has poor aging resistance and fast softening at high temperature. In addition, due to the relatively thick thickness of the plate during the preparation process, in the process of ingot casting, due to the spatial scale effect, casting environment, The inhomogeneity and discontinuity of billet component structure, various manufacturing energy fields and forming interfaces are ver...

Examples

Embodiment 1

[0026] A method for preparing an ultra-thick aluminum alloy plate, comprising the following steps:

[0027] A. Ingredients: The raw materials for preparing 2-series ultra-thick aluminum alloy plates are mixed according to weight percentage:

[0028] element Si Cu Mg Zn Zr sc La PM Eu Gd Impurities A1 content 0.15 0.1 0.7 0.3 0.02 0.07 0.01 0.02 0.025 0.003 0.1 margin

[0029] B. Melting and casting: Add the prepared aluminum alloy raw materials into the smelting furnace to mix them evenly and then melt them into liquid aluminum alloys. Ingot, in which the molten aluminum is solidified and dummy in the hot top crystallizer. After the dummy ingot starts, 7 sets of ultrasonic vibration systems are applied in the hot top crystallizer. The radiation rod of the ultrasonic vibration system is immersed in the melt to a depth of 200mm. The vibration frequency of the vibration system is 10kHz; when the casting length of molten alumin...

Embodiment 2

[0037] The difference between Example 2 and Example 1 is that in step A, the raw materials for preparing the 2-series ultra-thick aluminum alloy plate are prepared according to weight percentage:

[0038] element Si Cu Mg Zn Zr sc La PM Eu Gd Impurities A1 content 0.7 0.4 1.2 0.65 0.07 0.2 0.03 0.06 0.055 0.01 0.1 margin

Embodiment 3

[0040] The difference between embodiment 3 and embodiment 1 is that in step B, two sets of ultrasonic vibration systems are applied in the hot top crystallizer. The radiation rod of the ultrasonic vibration system is immersed in the melt to a depth of 15 mm, and the vibration frequency of the ultrasonic vibration system is 30 kHz.

technical field

[0001] The invention belongs to the technical field of aluminum alloy processing, and relates to a method for preparing an ultra-thick aluminum alloy plate. Background technique

[0002] Aluminum alloy has the advantages of low density, high specific strength, excellent electrical and thermal conductivity, and good machinability. It is widely used in aerospace industry, electric power industry, automobile manufacturing, construction industry, food industry, marine shipbuilding and other fields. However, although the 2-series aluminum alloy has the advantage of super high strength, it has poor aging resistance and fast softening at high temperature. In addition, due to the relatively thick thickness of the plate during the preparation process, in the process of ingot casting, due to the spatial scale effect, casting environment, The inhomogeneity and discontinuity of billet component structure, various manufacturing energy fields and forming interfaces are ver...

Examples

Embodiment 1

[0026] A method for preparing an ultra-thick aluminum alloy plate, comprising the following steps:

[0027] A. Ingredients: The raw materials for preparing 2-series ultra-thick aluminum alloy plates are mixed according to weight percentage:

[0028] element Si Cu Mg Zn Zr sc La PM Eu Gd Impurities A1 content 0.15 0.1 0.7 0.3 0.02 0.07 0.01 0.02 0.025 0.003 0.1 margin

[0029] B. Melting and casting: Add the prepared aluminum alloy raw materials into the smelting furnace to mix them evenly and then melt them into liquid aluminum alloys. Ingot, in which the molten aluminum is solidified and dummy in the hot top crystallizer. After the dummy ingot starts, 7 sets of ultrasonic vibration systems are applied in the hot top crystallizer. The radiation rod of the ultrasonic vibration system is immersed in the melt to a depth of 200mm. The vibration frequency of the vibration system is 10kHz; when the casting length of molten alumin...

Embodiment 2

[0037] The difference between Example 2 and Example 1 is that in step A, the raw materials for preparing the 2-series ultra-thick aluminum alloy plate are prepared according to weight percentage:

[0038] element Si Cu Mg Zn Zr sc La PM Eu Gd Impurities A1 content 0.7 0.4 1.2 0.65 0.07 0.2 0.03 0.06 0.055 0.01 0.1 margin

Embodiment 3

[0040] The difference between embodiment 3 and embodiment 1 is that in step B, two sets of ultrasonic vibration systems are applied in the hot top crystallizer. The radiation rod of the ultrasonic vibration system is immersed in the melt to a depth of 15 mm, and the vibration frequency of the ultrasonic vibration system is 30 kHz.