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等溫退火過程中AA3003冷軋鋁合金的析出行為
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更新時間：2015-08-18
通過電導率測試、硬度試驗、偏光顯微鏡以及透射電鏡的觀察，研究不同冷軋變形量下AA3003鋁合金在等溫退火(350~500 ℃)過程中的析出行為及其對合金顯微組織的影響。
等溫退火過程中AA3003冷軋鋁合金的析出行為Precipitation behavior of AA3003 cold-rolled aluminium alloy during isothermal annealing
通過電導率測試、硬度試驗、偏光顯微鏡以及透射電鏡的觀察，研究不同冷軋變形量下AA3003鋁合金在等溫退火(350~500 ℃)過程中的析出行為及其對合金顯微組織的影響。結(jié)果表明：隨著變形量的增大，最佳析出溫度明顯地由高溫向低溫移動，降幅超過100 ℃；冷軋變形促進析出，且隨退火溫度的升高其促進析出的能力逐漸減弱；尤其在高溫段(450、500 ℃)等溫退火時，析出峰的移動以及再結(jié)晶的影響致使電導率曲線的位置隨冷軋變形量的增大而出現(xiàn)上下波動的現(xiàn)象；析出粒子的形核位置也會受到再結(jié)晶的影響。
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.