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The factors affecting the time limitation of industrial aluminum profiles

Update time : 2023-03-15 09:25:51

Many people think that the aging hardening of industrial aluminum profiles is the result of solute atomization hardening zone, but it not only depends on the composition of alloying elements, aging process, but also depends on the defect state produced in the production process of alloy, especially the number and distribution of vacancy, dislocation, etc.

1. Influence of solid solution treatment process on industrial aluminum profiles

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, holding time should be longer, which is conducive to obtain the uniform solid solution of Z supersaturation; In addition, the second phase cannot be precipitated in the quenching cooling process, otherwise it will cause local uneven precipitation and reduce the effect of aging strengthening.

2. Regression phenomenon of industrial aluminum profiles

Theoretically, regression treatment is not limited by the number of treatments, but in practice, it is difficult to completely redissolve precipitated phase during regression treatment, resulting in local precipitated phase in the subsequent aging process, which weakens the strengthening effect of aging step by step. Therefore, regression processing is only used to repair aircraft with riveting alloy, you can take advantage of this phenomenon, riveting at any time, and other industrial aluminum profiles have little use value.

3. Influence of aging temperature

When the temperature is too low, GP zone is not easy to form due to diffusion difficulties, and the strength and hardness after aging are low. When the aging temperature is too high, diffusion is easy. The critical nucleus size of precipitated phase in susaturated solid solution is large, and the strength and hardness after aging are low, that is, over-aging occurs.

4. The affect of chemical ingredient of industrial aluminum profiles

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 to which the solid solubility changes with temperature. For example, the solid solubility of silicon and manganese in aluminum is relatively small and does not change much with temperature, while magnesium and zinc have large solid solubility in aluminum based solid solution, but the structure and matrix of the compounds formed by them and aluminum are little different, and the strengthening effect is little.

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