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采用扫描电子显微镜(SEM),X射线衍射仪(XRD)和透射电子显微镜(TEM),研究了铸态5383铝合金的元素偏析行为及均匀化制度对其微观组织演变的影响.研究结果表明:铸态5383铝合金组织中Mg、Cu和Mn等元素偏析严重,晶界处有大量网状分布的难溶金属间相;均匀化处理后,非平衡共晶相和难溶金属间相发生回溶,晶粒长大并球化,Mg、Cu和Mn等元素偏析程度减小,同时在位错和晶界附近有大量细小析出相;结合试验及均匀化动力学方程计算结果,得到试验合金的最佳均匀化工艺为480~490℃退火24h,过烧温度为506℃.
The effects of elemental segregation and homogenization on the microstructure evolution of as-cast 5383 aluminum alloy were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results show that: In the as-cast 5383 aluminum alloy, elements such as Mg, Cu and Mn are seriously segregated, and there are a large number of insoluble intermetallic phases distributed in the grain boundaries. After the homogenization treatment, the non-equilibrium eutectic phase and the hardly intermetallic phase occur Dissolution, grain growth and spheroidization, Mg, Cu and Mn and other elements to reduce the degree of segregation, at the same time in the dislocation and grain boundary near a large number of small precipitation phase; combined test and uniform kinetic equation results obtained experimental alloy The best homogenization process is annealing at 480 ~ 490 ℃ for 24h and over burning temperature is 506 ℃.