[China Aluminum Industry Network] Qualified chemical composition is the premise of achieving mechanical properties
Before extrusion, we must ensure that the composition of cast aluminum indicators meet the national standard requirements, in particular, Si, Mg content has an important impact on its mechanical properties, we know that 6061 main reinforcement Mg2Si, if not enough Mg2Si Therefore, the subsequent solution treatment, quenching, and aging have no meaning anymore, and will not achieve a strengthening effect.
Strict process control during extrusion is the key to good mechanical properties
In the production process, due to the limitations of actual conditions, employees often have difficulty in grasping the control of the process, often failing to realize the importance of the process, and not strictly controlling the temperature and speed, resulting in the failure of the mechanical properties after product aging. qualified.
For example, if our rod temperature is not enough, then the alloy cannot reach the solution treatment temperature during extrusion, and it cannot be ensured that the reinforcement Mg2Si is completely dissolved into the aluminum matrix and thus cannot be strengthened; if our rod The temperature is too high, then in the extrusion process, due to high temperatures not only will destroy the alloy structure, but also often appear to tear, poor surface quality and other issues.
For example, if our cooling effect is not good, the alloy can not be rapidly cooled after the solution treatment, then the strengthening phase Mg2Si dissolved in the aluminum matrix can not be stably retained in the matrix, with the decrease of temperature, Mg2Si in the matrix As the solubility decreases, it slowly precipitates, so that its mechanical properties cannot be guaranteed after aging. However, if the solution is cooled rapidly during the solution treatment, the reinforcement will not be able to precipitate and will remain in the matrix so that it can be strengthened after aging. Therefore, the control of temperature and other processes is the key.
In the actual production process, the process parameters should be flexibly adjusted according to the cross-section of the profile. For example, some thicker profiles should be properly increased in bar temperature, slow down the extrusion speed, increase the cooling rate, etc. in order to ensure that they are oversaturated. Solid solution.
The correct aging process is a guarantee of good mechanical properties
The main purpose of profile aging is to play a role of dispersion strengthening, which makes the strengthening phase Mg2Si dissolved in the matrix evenly and diffusely distributed into the matrix during the aging process, thus playing an intensifying role. In the aging process, if our temperature and time are not well controlled and cannot achieve the purpose of aging, its mechanical properties certainly cannot be guaranteed.
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