活塞用鋁合金復合鑄造的界面及硬度

活塞用鋁合金復合鑄造的界面及硬度Interface and hardness of piston aluminum alloy prepared by compound casting

在ZL109合金表面電鍍Cu改善其潤濕性，并用重力鑄造成功制備ZL109-Al99.5和ZL109-ZL109復合鑄造件。利用掃描電鏡和能譜儀分析復合鑄造件的顯微結構和元素組成，并測試其室溫硬度。結果表明：ZL109-Al99.5和ZL109-ZL109復合鑄造件均具有良好的冶金結合界面，界面結合為熔合結合與擴散結合作用；ZL109-Al99.5顯微硬度從Al99.5側的30HV左右向ZL109合金側逐步遞增至85HV，而ZL109-ZL109的硬度則在界面處出現波谷，硬度為64HV左右，界面組織主要表現為α(Al)柱狀晶。

A copper layer was electroplated on the surface of ZL109 alloy to improve its wettability, and ZL109-Al99.5 and ZL109-ZL109 joints were successfully prepared by compound casting. The microstructure and composition of the compound casting joints were analyzed by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results show that ZL109-Al99.5 and ZL109-ZL109 compound casting joints have good metallurgical bonding interface and the interface is mainly in the form of diffusion bonding, assisting with fusion bonding. The microhardness of ZL109-Al99.5 interface layer increases from Al99.5 side to ZL109 side, while there appears a microhardness trough value at the interface of ZL109-ZL109 compound casting joint, because the interface mainly consists of α(Al) columnar crystals.

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