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等温退火过程中AA3003冷轧铝合金的析出行为
发布人：上海艾荔艾金属材料有限公司www.shailiai.com
更新时间：2015-08-18
通过电导率测试、硬度试验、偏光显微镜以及透射电镜的观察，研究不同冷轧变形量下AA3003铝合金在等温退火(350~500 ℃)过程中的析出行为及其对合金显微组织的影响。
等温退火过程中AA3003冷轧铝合金的析出行为Precipitation behavior of AA3003 cold-rolled aluminium alloy during isothermal annealing
通过电导率测试、硬度试验、偏光显微镜以及透射电镜的观察，研究不同冷轧变形量下AA3003铝合金在等温退火(350~500 ℃)过程中的析出行为及其对合金显微组织的影响。结果表明：随着变形量的增大，最佳析出温度明显地由高温向低温移动，降幅超过100 ℃；冷轧变形促进析出，且随退火温度的升高其促进析出的能力逐渐减弱；尤其在高温段(450、500 ℃)等温退火时，析出峰的移动以及再结晶的影响致使电导率曲线的位置随冷轧变形量的增大而出现上下波动的现象；析出粒子的形核位置也会受到再结晶的影响。
Under different cold rolling reductions, the precipitation behavior of AA3003 aluminium alloy during isothermal annealing (350~500 ℃) and its effect on the microstructures of the alloy were investigated by electrical conductivity measurements, hardness, polarized light microscopy and transmission electron microscopy. The results show that the most favourable temperature of precipitation moves obviously from high temperature to the low temperature with the reduction increasing, and this drop is more than 100 ℃. The cold rolling deformation accelerates the precipitation and this effect decreases as the annealing temperature increasing. Especially, in the high temperature (450、500 ℃) region of isothermal annealing, the moving precipitation peaks and the effect of recrystallization cause the shift of the conductivity curve to fluctuation as the cold rolling reduction increasing. The nucleation sites of the precipitates are influenced by recrystallization.