论文部分内容阅读
为研究均匀化退火处理对Mg-3Al-1Zn-2.2/5Sr镁合金中第二相的影响,通过X射线衍射分析(XRD)、扫描电镜观察(SEM)和能谱分析(EDS)等手段,并结合Pandat热力学计算软件,对Mg-3Al-1Zn-2.2/5Sr镁合金均匀化退火后组织中的第二相的类型及形成原因进行了分析。结果表明:经过400℃,15 h(炉冷)的均匀化退火处理以后,合金铸态组织中原本存在的(Mg,Al)17Sr2相中固溶的Al元素所占原子分数有所降低。此外,Sr含量为2.2%(质量分数)的合金组织中可以观察到大量沿(Mg,Al)17Sr2相边缘分布的颗粒状Al4Sr相,而Sr含量为5%的合金中基本观察不到(Mg,Al)17Sr2相的变化。
In order to study the effect of homogenization annealing on the second phase in Mg-3Al-1Zn-2.2 / 5Sr magnesium alloy, X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) Combined with Pandat thermodynamic calculation software, the type and formation of the second phase in the homogenized annealed Mg-3Al-1Zn-2.2 / 5Sr magnesium alloy were analyzed. The results show that after the homogenization annealing at 400 ℃ for 15 h (furnace cooling), the atomic fraction of Al dissolved in the as-cast (Mg, Al) 17Sr2 phase in the as-cast alloy decreases. In addition, a large amount of granular Al4Sr phase distributed along the edge of the (Mg, Al) 17Sr2 phase can be observed in the alloy structure with a Sr content of 2.2% (mass fraction), while the Mg , Al) 17Sr2 phase changes.