[China Aluminum Industry Network] Aluminum and aluminum alloys are materials with large amounts and high yields in non-ferrous metals and are the pillar industries of the national economy. They are widely used in aviation, transportation, building materials, machinery, packaging, and other industries. They are also important. Defense material. The 2024 metal Al-Cu-Mg series high strength aluminum alloy has long been a major structural material for the aerospace industry due to its high strength, good heat resistance, excellent formability, and resistance to damage. Therefore, it is of great practical significance to explore the new heat treatment process system and improve the comprehensive performance of the 2024 alloy.
The solution treatment holding time is 50min, and the solution temperature is 460, 480, 500 and 520°C, respectively. It is used to warm the furnace, after the solution is completed, the water is quickly taken out. The effect of the solid solution time on the performance is that the sample is placed in a heat treatment furnace at 500° C. for 30, 50, 70, and 90 minutes respectively. After the solution is completed, the water is quickly taken out. To study the effect of aging treatment on the performance, the sample was first subjected to solution treatment at 500°C for 50 minutes, and then the sample was subjected to aging heat treatment at different temperatures for a long time, and the mechanical properties of the sample were measured at intervals. The aging temperatures were 130, 170, 180, 190, and 210 °C, respectively. Used to warm the furnace, the cooling method is fast water cooling. Quickly take out after every 1h, rapid water cooling for hardness testing, and then quickly return to the heat treatment furnace for aging heat treatment, a total aging time of 15h.
The heat treatment process has a significant effect on the microstructure and properties of the 2024 alloy. The higher the solution temperature, the greater the concentration of solid solution alloy elements, which increases the degree of solid solution, and the higher the concentration of supersaturated solid solution after quenching. After ageing, it will have higher strength; with the increase of the holding time, the hardness of the alloy will increase first and then become more gentle and decrease. The hardness value peaks at 500°C for 50min. The shorter the aging time, the shorter the aging time, and the faster the aging time, the higher the aging time at 180°C. Higher hardness.
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