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利用原子力显微镜(AFM)、扫描电子显微镜(SEM)和透射电镜(TEM)对TC4合金表面NiCrBSiC合金激光熔覆层中反应合成的TiC和TiB2形貌进行了观察,分析了TiC和TiB2相的生长机制。结果表明,激光熔覆反应合成的TiC相呈等轴树枝晶状,并具有非小平面和小平面两种生长界面(当树枝品是寸较小时,具有非小平面生长界面,当树枝晶尺寸较大时,具有小平面生长界面),TiB2相呈六棱柱状,通常住TiC树枝晶表面异质形核,并以小平面形式生长,最终形成心部为TiC相外部为TiB2相的特殊复相结构。
The morphology of TiC and TiB2 synthesized by laser cladding of NiCrBSiC alloy on TC4 alloy was observed by atomic force microscope (AFM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The growth of TiC and TiB2 phase mechanism. The results show that the TiC phase synthesized by laser cladding has an equiaxed dendritic shape and has two non-faceted and faceted growth interfaces (when the dendrites are smaller in size, they have a non-faceted growth interface. When the dendrite size Large, with a small plane growth interface), TiB2 phase was hexagonal columnar, usually living TiC dendrites heterogeneous surface nucleation and growth in the form of small plane, the final form of the heart TiC phase is the outer TiB2 phase special complex Phase structure.