均匀化工艺对3104铝合金中弥散相分布的影响

发布时间：2018-11-17 10:27

【摘要】：利用光学显微镜和电导率测试仪对3104铝合金不同均匀化条件下的弥散相析出情况进行研究。结果表明,3104铝合金铸锭中只有存在少量Al_(12)Mn_3Si弥散相,均匀化后基体中析出大量Al_(12)Mn_3Si弥散相,呈点状或短棒状,合金电导率升高。随时均匀化温度升高,弥散相发生粗化和回溶,密度减小,尺寸增大,并且合金电导率逐渐降低。因此,经600℃×10 h均匀化弥散相的密度最低,尺寸最大,为400~500 nm。均匀化升温降温速率对弥散相析出有影响,均匀化升温速率减慢,弥散相数量增加,尺寸减小;均匀化冷却速率增加,数量减少,尺寸略有减小;而样品重新在500℃保温2 h后,弥散相数量明显增加,电导率升高,但相互之间差别不大。因此,3104铝合金铸锭在较高温度下(580℃以上)保温较长时间,有利于获得合理的弥散相粒子分布。
[Abstract]:Dispersion phase precipitation of 3104 aluminum alloy under different homogenization conditions was studied by optical microscope and conductivity tester. The results show that there is only a small amount of Al_ (12) Mn_3Si dispersion phase in 3104 aluminum alloy ingot. After homogenization, a large number of Al_ (12) Mn_3Si dispersion phases are precipitated in the matrix, and the alloy electrical conductivity is increased. With the increase of homogenization temperature, coarsening and remelting of the dispersed phase occur, the density decreases, the size increases, and the electrical conductivity of the alloy decreases gradually. Therefore, the density of homogenized dispersion phase at 600 鈩，

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