Heat treatment method for aluminum alloy
A heat treatment method and aluminum alloy technology, which is applied in the field of heat treatment of aluminum alloys, can solve the problems that the strength and fracture ductility of aluminum alloys cannot be improved at the same time, and achieve the goal of improving strength and work hardening ability, increasing strength and fracture ductility, and improving fracture ductility Effect
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Embodiment 1
[0029] 6061 aluminum alloy bar is used as a sample for heat treatment. The mass percentage of each component of the aluminum alloy is: Si 0.6%, Fe 0.7%, Cu 0.25%, Mn 0.15%, Mg 1.0%, Cr 0.2%, Zn 0.25% , Ti 0.15%, the rest is Al.
[0030] 1. Solution treatment
[0031] In a salt bath furnace, the above-mentioned aluminum alloy sample was kept at a solution temperature of 510° C. for 2 hours.
[0032] 2. Quenching treatment
[0033] Immediately immerse the aluminum alloy after solution treatment in water at 25°C within less than 60 seconds of quenching transfer time for quenching treatment until the temperature of the aluminum alloy becomes room temperature.
[0034] 3. Ultra-low temperature cold rolling treatment
[0035] Next, the sample was dipped in liquid nitrogen at minus 190°C for 8 times of cold rolling, the rolling pressure was 100 tons, and the rolling speed was 40 m / min so that the deformation of the aluminum alloy in a single cold rolling was 10%, and the total def...
Embodiment 2
[0053] The same aluminum alloy sample as in Example 1 was used.
[0054] The aluminum alloy samples were heat treated according to the heat treatment method described in Example 1. The difference was that during the ultra-low temperature cold rolling process, the aluminum alloy samples were immersed in liquid nitrogen at minus 170°C for 11 cold rolling treatments, so that the aluminum The single cold-rolling deformation of the alloy is 8%, and the total deformation is 88%, and the horizontal and vertical alternate cold rolling treatments are adopted; during the low-temperature annealing process, the aluminum alloy samples are placed in a DZF-6210 vacuum oven at 150 ℃ for 5 minutes at the annealing temperature; during the aging treatment, the aluminum alloy sample was kept in a DZF-6210 vacuum oven for 8 hours at an aging temperature of 100 ℃. Then the aluminum alloy samples were cooled in the furnace.
[0055] The fracture of the sample after stretching was observed under the...
Embodiment 3
[0057] The same aluminum alloy sample as in Example 1 was used.
[0058] The aluminum alloy samples were heat treated according to the heat treatment method described in Example 1. The difference was that during the ultra-low temperature cold rolling process, the aluminum alloy samples were immersed in liquid nitrogen at minus 200°C for seven times of cold rolling, so that the aluminum The single cold rolling deformation of the alloy is 12%, and the total deformation is 84%. The horizontal and vertical cold rolling are alternately processed; ℃ for 2 minutes at the annealing temperature; during the aging treatment, the aluminum alloy sample was kept in a DZF-6210 vacuum oven for 5 hours at an aging temperature of 150 ℃. Then the aluminum alloy samples were cooled in the furnace.
[0059] The fracture of the sample after stretching was observed under the model JSM-35C scanning electron microscope, and the scanning electron microscope photos were obtained as follows: Figure 4 ...
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