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采用液固铸造法制备4343/3003/4343复合锭,研究了浇注温度对复合锭的界面组织和结合强度的影响,讨论了复合锭的界面结合机理。结果表明,在725~750℃下浇注4343/3003/4343复合锭,复合锭的复合界面表现为冶金结合,由Al-Si固溶体层和Si、Mn元素扩散层构成,Al-Si固溶体层厚薄均匀,Si、Mn元素的扩散距离分别为10μm和32μm,复合界面的结合强度高于3003铝合金的抗拉强度。液固铸造4343/3003/4343铝合金复合锭的界面复合机理为:4343铝合金熔体首先在3003铝合金复合锭表面急冷形成Al-Si固溶体,Al-Si固溶体中的Si和3003铝合金中的Mn再相互扩散,形成冶金结合。
The 4343/3003/4343 composite ingot was prepared by liquid-solid casting. The influence of pouring temperature on the interfacial microstructure and bonding strength of the ingot was studied. The interface bonding mechanism of the ingot was discussed. The results showed that the composite interface of 4343/3003/4343 composite ingot was cast at 725-750 ℃. The composite interface of the composite ingot showed metallurgical bonding, consisting of Al-Si solid solution layer and Si, Mn element diffusion layer. The thickness of Al-Si solid solution layer was uniform , Si, Mn diffusion distance of the elements were 10μm and 32μm, the bonding strength of the composite interface is higher than the tensile strength of 3003 aluminum alloy. The interface mechanism of liquid-solid cast 4343/3003/4343 aluminum alloy ingot was as follows: 4343 aluminum alloy melt was firstly formed on the surface of 3003 aluminum alloy ingot by rapid cooling to form Al-Si solid solution, Si in Al-Si solid solution and 3003 aluminum alloy Of Mn and then mutual diffusion, forming a metallurgical bond.