1. Effect of solution treatment process of industrial aluminum profile
In order to obtain a good aging strengthening effect, the quenching heating temperature should be higher and the holding time should be longer without overheating, over-firing and grain growth, which is conducive to obtaining a uniform solid solution with higher supersaturation; In addition, the second phase cannot be precipitated during the quenching and cooling process, otherwise it will cause local uneven precipitation and reduce the aging strengthening effect.
2. The regression phenomenon of industrial aluminum profiles
In theory, the regression process is not limited by the number of treatments, but in fact, it is difficult to completely re-dissolve the precipitated phase during the regression process, which causes the precipitated phase to precipitate locally during the subsequent aging process, which gradually weakens the aging strengthening effect. Therefore, the regression process is only used to repair rivet alloys for aircraft, which can take advantage of this phenomenon and carry out riveting at any time, and has little use value for other industrial aluminum profiles.
3. The effect of aging temperature
When aging at different temperatures, the critical crystal nucleus size, number, composition and aggregation growth rate of the precipitated phase are different. If the temperature is too low, the GP region is not easy to form due to the difficulty of diffusion. The strength and hardness after aging are low. When it is high, the diffusion is easy to proceed, the critical crystal nucleus size of the precipitated phase in the supersaturated solid solution is large, and the strength and hardness after aging are low, that is, overaging.
4. The influence of chemical composition of industrial aluminum profiles
Whether an alloy can be strengthened through aging depends first on whether the elements that make up the alloy are soluble in the solid solution and the degree to which the solid solubility changes with temperature. For example, the solid solubility of silicon and manganese in aluminum is relatively small, and it does not change much with temperature. Although magnesium and zinc have greater solid solubility in aluminum-based solid solution, the structure and matrix of the compound formed with aluminum The difference is not large, and the strengthening effect is minimal.