Interfacial characterisation of overcasting a cast Al-Si-Mg (A356) alloy on a wrought Al-Mg-Si (AA6060) alloy
Interfacial characterisation of overcasting a cast Al-Si-Mg (A356) alloy on a wrought Al-Mg-Si (AA6060) alloy
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DOI：
10.1016/j.jmatprotec.2016.12.022
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发表时间：
2017-05
影响因子：
6.3
通讯作者：
Yijie Zhang;S. Ji;G. Scamans;Z. Fan
中科院分区：
文献类型：
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作者：
Yijie Zhang;S. Ji;G. Scamans;Z. Fan
通过覆铸研究了混合Al-Si-Mg (A356)和Al-Mg-Si (AA6060)材料的显微组织和拉伸性能。在铸态和T7热处理条件下，AA6060/A356界面处获得了牢固的结合。通过合理设计的铸造结构和优化的包覆工艺，成功去除了AA6060刀片表面的氧化膜。结合界面处可以形成细小的等轴初生α-Al晶粒，在此期间，A356合金中的初生α-Al晶粒在AA6060合金实心刀片中的初生α-Al晶粒上长大。 EBSD 结果表明，这两种初生 α-Al 晶粒表现出相同的取向，表明铸造 A356 合金和变形 AA6060 合金在界面处共享一个初生 α-Al 晶粒。界面结合强度在 180 MPa 水平下测量。阴铸结构中的热影响区并不明显，因为与原始AA6060合金在时效条件下的性能相比，阴铸艺术的极限抗拉强度仅下降了3%~5%。
The microstructure and tensile properties of hybrid Al-Si-Mg (A356) and Al-Mg-Si (AA6060) materials were investigated through overcasting. The solid bonding at AA6060/A356 interface was obtained under as-cast condition and T7 heat-treated condition. The oxide film on the surface of the AA6060 inserts was successfully removed by properly designed casting structure and optimised overcasting process. Fine equiaxed primary α-Al grains could be formed at the bonding interface, during which the primary α-Al grains in the A356 alloy were grown up on the primary α-Al grains in the solid inserts of AA6060 alloy. EBSD results revealed that these two types of primary α-Al grains exhibited the same orientation, indicating the cast A356 alloy and the wrought AA6060 alloy shared one primary α-Al grain at the interface. The interfacial bonding strength was measured at a level of 180 MPa. Heat-affected zone was not significant in the overcast structure because the decrease of the ultimate tensile strength of overcast arts was only 3–5% in comparison with the properties of the original AA6060 alloys under aged condition.