车用铸态7055铝合金的均匀化退火组织特性分析
发布时间：2019-01-21 10:47
【摘要】：采用光学显微镜(OM)、扫描电镜(SEM)、X射线衍射(XRD)以及差示扫描量热仪(DSC)等技术对车用铸态7055铝合金组织及均匀化退火过程中的组织演变进行研究。结果表明:均匀化退火后铝合金枝晶间距明显缩小,晶粒细化。部分金属间化合物以及许多非平衡共晶组织出现在晶界部位,呈现网状片层的连续分布结构,在铸态组织内生成了具有较高Zn、Cu、Mg含量的共晶相。MgZn_2相随着均匀化退火时间增加发生回溶现象。将均匀化退火时间增加到40 h,表现出明显的均匀化效果。确定465℃下处理40 h作为最优的单级均匀化条件。
[Abstract]:The microstructure evolution of as-cast 7055 aluminum alloy during homogenization annealing was studied by means of optical microscope (OM), scanning electron microscope (SEM), X ray diffraction (XRD) and differential scanning calorimeter (DSC). The results show that after homogenization annealing, the dendrite spacing of aluminum alloy is obviously reduced and the grain size is refined. Some intermetallic compounds and many non-equilibrium eutectic structures appear at grain boundaries, showing a continuous distribution structure of netlike lamellae. In the as-cast structure, high Zn,Cu, is formed. The eutectic phase with Mg content and MgZn_2 phase redissolve with the increase of homogenization annealing time. When the homogenization annealing time is increased to 40 h, the homogenization effect is obvious. The optimal single stage homogenization condition was determined at 465 鈩，
本文编号：2412585
[Abstract]:The microstructure evolution of as-cast 7055 aluminum alloy during homogenization annealing was studied by means of optical microscope (OM), scanning electron microscope (SEM), X ray diffraction (XRD) and differential scanning calorimeter (DSC). The results show that after homogenization annealing, the dendrite spacing of aluminum alloy is obviously reduced and the grain size is refined. Some intermetallic compounds and many non-equilibrium eutectic structures appear at grain boundaries, showing a continuous distribution structure of netlike lamellae. In the as-cast structure, high Zn,Cu, is formed. The eutectic phase with Mg content and MgZn_2 phase redissolve with the increase of homogenization annealing time. When the homogenization annealing time is increased to 40 h, the homogenization effect is obvious. The optimal single stage homogenization condition was determined at 465 鈩，
本文编号：2412585
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