双辊激冷铸造A8006合金的均匀化(英文)

通过SEM、XRD与硬度测定研究均匀化过程对双辊激冷铸造(TRC)与直接冷却铸造(DC)A8006合金的微观组织和性能的影响。结果表明,随着TRC合金微观组织的细化,均匀化后合金中的共晶相进一步细化。DC合金均匀化后其共晶相形态相似于TRC合金中的共晶相形态。均匀化后,合金共晶相中的Fe、Mn元素均匀地扩散到铝基体中,引起合金硬度的降低。TRC合金的成形性能优于均匀化的DC合金,所以,对于TRCA8006合金的后续加工过程可省去均匀化过程。

Homogenization of twin-roll cast A8006 alloy

Microstructure and hardness of twin-roll casting(TRC) process and direct-chill casting(DC) for A8006 alloy with and without homogenization were investigated by means of scanning electron microscopy(SEM),X-ray diffraction analysis and Vickers hardness measurement.The results show that the eutectic phase of the homogenized TRC alloy becomes fine as the microstructure of the as-cast TRC alloy is refined.The short rodlike eutectic phase of the as-cast TRC alloy is dispersed homogeneously,which is similar to the morphology of eutectic phase of the homogenized DC alloy.After homogenization,elements Fe and Mn in DC and TRC alloys are diffused from eutectic phase to Al matrix,resulting in the decrease of microhardness.The formability of the as-cast TRC alloy is superior to that of the homogenized DC alloy.For TRC A8006 alloy,the homogenizing cycle can be removed from the subsequent processing.