Preparation technology of high-comprehensive-performance aluminum-lithium alloy plate
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A technology of comprehensive performance and preparation process, which is applied in the field of preparation of high comprehensive performance aluminum-lithium alloy plates, can solve the problems of alloy fracture toughness reduction, high production cost, and long cycle, and achieve the goal of improving fracture toughness and alloy plasticity Effect
Pending Publication Date: 2021-11-30
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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But on the one hand, the process steps are relatively complicated, and the plate needs a medium temperature rolling and a second solution quenching, resulting in high production costs and long cycles
On the other hand, the final structure of the alloy prepared by this process is a partially recrystallized structure, which will lead to a decrease in the fracture toughness of the alloy. Plasticity is still not ideal
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Embodiment 1
[0030] Adopting the preparation method of the high-comprehensive-performance aluminum-lithium alloy plate involved in the present invention, the corresponding alloy composition and weight percentage are: Cu 4.3%, Li 1.56%, Mg 0.28%, Zn 0.40%, Mn 0.41%, Ag 0.30% , Zr0.08%, Ti 0.02%, Si 0.08%, Fe 0.13%, the balance is Al, the slab with a thickness of 320mm is heated at a temperature of 420±10°C, and then hot rolled out of the furnace, temperature controlled and speed controlled Rolled to 100mm, the final rolling temperature is 401°C, and then cooled to 85°C within 5 minutes by emulsion cooling. Then, dry the surface, air-cool the plate to room temperature and put it into an air circulation heating furnace for heating at a heating temperature of 505°C. After reaching the temperature, keep it for 2 hours, and then air-cool it to 465°C for the second rolling, and stop when the rolling reaches 80mm , the final rolling temperature is 438°C, transfer to the horse rack for spray coolin...
Embodiment 2
[0037] Adopting the preparation method of the high comprehensive performance aluminum-lithium alloy plate involved in the present invention, the alloy composition and weight percentage are: Cu 3.3%, Li 1.1%, Mg0.44%, Mn 0.42%, Zn0.55%, Zr 0.11% , Ag 0.32%, Ti0.02%, Sc 0.08%, Si 0.08%, Fe 0.13%, the balance is Al, the flat ingot with a thickness of 400mm after homogenization treatment is heated at 400±10℃, and then taken out of the furnace Hot rolling, temperature-controlled, controlled-speed rolling to 90mm, the final rolling temperature is 377°C, and then cooled to 50°C within 4 minutes by emulsion cooling. Then, dry the surface, air-cool the plate to room temperature and put it into the air circulation heating furnace for heating, the heating temperature is 520°C, keep it warm for 1.5h after reaching the temperature, and then air-cool the plate to 470°C for secondary rolling, when the rolling reaches 60mm Stop, the final rolling temperature is 445°C, transfer to the horse ra...
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Abstract
The invention relates to a preparation technology of a high-comprehensive-performance aluminum-lithium alloy plate. The technology comprises the following steps that a cast ingot is subjected to temperature-controlled primary rolling, is rapidly cooled to the room temperature and then is placed into a high-temperature air circulation furnace to be heated, after heat preservation is performed for a period of time, the temperature is reduced to the specific temperature, the cast ingot is discharged from the furnace, secondary hot rolling is performed, and the cast ingot is rapidly cooled to the room temperature after being subjected to hot rolling to the specified size; and then the rolled plate is subjected to solid solution quenching, cold deformation and artificial aging treatment. By means of temperature-controlled hot primary rolling and rapid cooling after rolling, a Widmanstatten structure can be fully broken, appropriate deformation stored energy is reserved, the plate is recrystallized to a certain degree in the subsequent high-temperature heating process, flat and straight grain boundaries among grains in the hot-rolled plate are eliminated, and part of nested morphology is formed; through secondary rolling and rapid cooling at the specific temperature, a recrystallized structure can be transformed into a deformed structure again, and precipitation of large-size Widmanstatten is inhibited, so that the aluminum-lithium alloy treated to be in a final use state has excellent comprehensive performance.
Description
technical field [0001] The invention relates to a method for preparing an aluminum-lithium alloy plate with high comprehensive performance, which belongs to the aluminum alloy thermal processing and heat treatment process. Background technique [0002] Compared with traditional aluminum alloys, aluminum-lithium alloys have lower density, higher stiffness and good fatigue damage resistance, and have gradually become one of the important structural materials in the field of aviation and aerospace. In order to further obtain a higher weight reduction effect, increasing the content of Li and Cu while adopting multi-element microalloying has become the development trend of high-performance aluminum-lithium alloys. However, with the addition of Cu and Li content and multi-component microalloying elements, insoluble coarse compounds with complex components will be formed during the solidification process of the ingot, and coarse flakes will be precipitated at the grain boundaries a...
Claims
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