Factors affecting the aging of aluminum profiles
发布时间：2019-11-04 浏览次数：0
1. Influence of solution treatment process on industrial aluminum profile
In order to obtain a good aging strengthening effect, under the condition of no overheating, overburning and grain growth, the quenching heating temperature should be higher, and the holding time should be longer, which is conducive to obtain a uniform solid solution with higher supersaturation; in addition, the second phase can not be separated out during quenching and cooling, otherwise it will cause local uneven precipitation and reduce the aging strengthening effect.
2. Regression phenomenon of industrial aluminum profiles
In theory, the regression treatment is not limited by the number of times of treatment, but in fact, it is difficult to make the precipitated phase completely re dissolve during the regression treatment, resulting in the local precipitation of precipitated phase in the later aging process, which gradually weakens the aging strengthening effect. Therefore, the regression treatment is only used to repair the rivet alloy used in aircraft, which can be used to rivet at any time, but has little use value for other industrial aluminum profiles.
3. Effect of aging temperature
When aging at different temperatures, the critical size, quantity, composition and growth rate of the precipitated phase are different. If the temperature is too low, it is difficult to form GP area due to diffusion, and the strength and hardness are low after aging. When the aging temperature is too high, the diffusion is easy to carry out. If the critical size of the precipitated phase in supersaturated solid solution is large, and the strength and hardness are low after aging, it will produce excessive Prescription.
4. Influence of chemical composition of industrial aluminum profile
Whether an alloy can be strengthened by aging depends first on whether the elements of the alloy can be dissolved in the solid solution and the degree of change of solid solubility with temperature. For example, the solid solubility of silicon and manganese in aluminum is relatively small, and does not change with temperature. Although magnesium and zinc have large solid solubility in aluminum based solid solution, the structure and matrix of the compounds formed by them and aluminum are not different, and the strengthening effect is very small.
