微观分析方法在半固态组织观察中的应用

Application of Microstructural Analysis to the Microstructure Observation of the Semi-solid Alloy

介绍了普通光学显微镜、扫描电子显微镜、能谱分析及激光共聚焦显微镜在半固态Mg-10Al-4Zn合金组织观察中的应用。结合定量分析计算了半固态组织的流变学参数,表明在本试验条件下得到的半固态组织均匀、细小、圆整度高,但固相率稍高;扫描电子显微镜观察材料的内部微观组织,并与能谱结合得出熔化首先发生在溶质含量较高的晶界;激光共聚焦在半固态组织上的应用是一个新的尝试,它在三维立体结构上证实了固相颗粒的形态为球形,并由二维平面高度图证明液相并非是完全共晶组织,而是由共晶相和重熔α-Mg相共同组成。

The microstructure of semi-solid Mg-10Al-4Zn alloy was observed by OM(optical microscope),SEM(scanning electron microscope),EDS(energy dispersive spectrometer) and LEXT.OM observation reveals that there exists the fine and round semi-solid microstructure with uniform distribution and higher solid fraction.The finer structure can be observed by SEM,and the melting firstly occurred in the boundary with higher solute concentration by combining with EDS analysis.LEXT observation indicates that the solid phase particle is spheroid in three-dimensional structure,which is composed of eutectic phase and remelting α-Mg phase by two-dimensional planar height diagram verification.