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采用先热浸镀后浇注的工艺制备了HT250/ZL101A双金属复合缸体,利用场发射扫描电镜等研究了不同制备工艺下双金属扩散界面的组织结构。研究发现,铝熔体环境对复合界面的结合起着关键作用,铝铁双金属的最佳制备工艺为铸铁在700℃的ZL101A熔体中且热浸镀10min。随着热浸镀时间的增长,扩散层的厚度和形貌并没有发生显著的变化,扩散层厚度最终保持在30μm左右,这一现象与扩散层中τ5-Al8Fe2Si相对Al原子扩散的阻碍作用有关。
HT250 / ZL101A bimetallic composite cylinder was prepared by hot-dip casting and then casting. The microstructure of bimetallic diffusion interface under different preparation processes was studied by using field emission scanning electron microscope. The study found that the aluminum melt environment plays a key role in the combination of the composite interface. The best preparation process of aluminum-bimetallic cast iron is ZL101A melt at 700 ℃ for 10 min. With the increase of hot-dip time, the thickness and morphology of the diffusion layer did not change significantly, and the thickness of the diffusion layer finally remained at about 30μm, which was related to the obstruction of the diffusion of τ5-Al8Fe2Si relative to the diffusion of Al atoms in the diffusion layer .