论文部分内容阅读
对加工硬化态直径为9.5 mm的6201铝合金进行了1 h不同温度的退火处理。通过硬度分析、宏微观组织分析以及DSC分析等方法探讨了加工硬化、时效强化以及固溶强化机制在6201铝合金不同温度退火过程中的作用。研究结果表明:退火温度在100~200℃变化时,时效强化作用大于回复软化作用,6201铝合金的维氏硬度随温度升高而升高,在200℃达到最大值为112.4 HV0.2;退火温度在200~350℃变化时,在过时效软化及回复再结晶软化作用下,6201铝合金的维氏硬度随温度升高而降低,350℃达到最低值为40.8 HV0.2;退火温度在350~500℃变化时Mg2Si开始向铝基体回溶,在固溶强化主导作用下,合金的硬度值随退火温度的升高再次持续增加,在500℃时增至77.0 HV0.2。
6201 aluminum alloy with a diameter of 9.5 mm was annealed at different temperatures for 1 h. The effects of work hardening, aging strengthening and solution strengthening mechanism on the annealing process of 6201 aluminum alloy at different temperatures were discussed by means of hardness analysis, macro-microstructure analysis and DSC analysis. The results show that when the annealing temperature changes from 100 ℃ to 200 ℃, the aging strengthening effect is greater than that of the softening point. The Vickers hardness of 6201 aluminum alloy increases with increasing temperature and reaches the maximum of 112.4 HV0.2 at 200 ℃. Under the temperature of 200 ~ 350 ℃, the Vickers hardness of 6201 aluminum alloy decreases with the increase of temperature and reaches the lowest value of 40.8 HV0.2 at 350 ℃ under the effect of over aging softening and recrystallization softening. The annealing temperature is 350 Mg2Si began to remelt to the aluminum matrix at ~ 500 ℃. Under the solid solution strengthening, the hardness of the alloy increased again with the increase of annealing temperature and increased to 77.0 HV0.2 at 500 ℃.