液固铸造4343/3003/4343铝合金复合锭的界面组织  

Interface Microstructure of 4343/3003/4343 Aluminum Alloy Clad Ingot Prepared by Liquid-solid Casting

作　　者：李滔[1,2] 周海涛[1] 王顺成 戚文军 郑开宏 

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]广东省工业技术研究院,广州510650

出　　处：《材料工程》2016年第1期19-25,共7页Journal of Materials Engineering

基　　金：广东省科技厅科技计划项目(2014B030301012;2015B090926013);广州市科信局科技计划项目(201509010003)

摘　　要：采用液固铸造法制备4343/3003/4343铝合金复合锭,研究了复合锭的界面组织、元素分布和界面结合强度,分析了复合锭的界面结合机理。结果表明：在725-750℃浇注4343铝合金,复合锭的界面冶金结合良好,复合界面清晰平直。复合界面由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,Mn,Si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相互扩散,形成牢固冶金结合的复合锭。4343/3003/4343 aluminum alloy clad ingots were prepared by liquid-solid casting.The microstructure,elements distribution and interface bonding strength of the clad ingots were investigated.The interface bonding mechanism of the clad ingots was analyzed.The results show that when the pouring temperature of 4343 aluminum alloy is 725-750℃,the metallurgical bonding of clad ingots is good,and with clear and flat interface.The metallurgical bonding interface of clad ingots consists of Al-Si solid solution layer and diffusion layer of Si and Mn.The thickness of Al-Si solid solution layer is uniform.The diffusion distances of Mn and Si are 10μm and 32μm,respectively.The bonding strength of clad ingots is higher than the ultimate tensile strength of 3003 aluminum alloy.The interface bonding mechanism of liquid-solid 4343/3003/4343 aluminum alloy clad ingot is as follows：firstly,the 4343 aluminum alloy melt is rapidly solidified on the surface of 3003 aluminum alloy ingot to form the Al-Si solid solution layer,then the Si in the Al-Si solid solution layer and the Mn in the 3003 aluminum alloy interdiffused to form the clad ingot with good metallurgical bonding interface.

关 键 词：铝合金复合锭 液固铸造 界面组织 结合机理 

分 类 号：TG244[金属学及工艺—铸造]