Steel - Aluminum Composite Interface Organizational Structure Study

Fiber reinforced aluminium matrix composites has been used in many fields , and steel fiber reinforced AMC has a lot of advantages than ceramic fiber reinforced AMC . But the controlling of inferface reaction is the key factor of affecting on composites' performances and also is the impediment of restricting its production and application region.This text stressly investigated methods of how to control Fe-Al composite interface in order to improve the integration of interface and reduce technologic complexity and production cost of FRAMC.This article adopted hot-dipping technics to fabricate the composite interface of Fe-Al, and investigated the effects of alloy elements, component of steel matrix and dipping time on the texture and structure of Fe-Al interface compound layer to explore the best means and technics parameter of interface controlling , and also academic analysed how to control the growth of interface compound layer on thermodynamic and kinetic points of view . Then chose 6063 alloy and stainless steel fiber , adopted moulding and extrusion to produce the composites and analysed its microstructure, tested its macroscopical mechanical capabilities , and explored the influencing law of interface microstructure to mechanical capabilities and forecasted the use of composites in last.The experimental results show that:(1) The plating layer is made up of external aluminium alloy layer and interfacial Fe-Al compound layer . The interface is toothed when mild steel and spring steel dip pure Al Al-Zn5 3003 and 6063 aluminium alloy , but the interface is smooth zonal when they dip Al-X5 alloy . The interfaces' shape of austenitic stainless steel dipping are smooth zonal, less influenced by composition of liquid . X changes the phase structure of interface compound layer, and the ternary compound blocks diffusion of Fe Al and alloy elements such as Zn Mn and Mg . Zn accelerates diffusion of Fe and Al;(2) Thickness of compound layer evidently increases when the steel dips Al-Zn5 alloy compared to dipping pure Al the same time , and it doesn't change obviously when dipping 3003 and 6063 alloy ,but it reduces clearly when dipping A1-X5 alloy . Thickness of compound layer ordinal reduces when mild steel , spring steel and austenitic stainless steel dip in the same liquid . Adding X into the liquid , choosing the austenitic stainless steel and shortening the dipping time are effective measures to control the growth of interface compound layer;(3) The compound layer is made up of FeAl₃ and Fe₂Al₅ when dipping pure Al but their content fall if dipping Al-Zn5 alloy and the strongest peak is Fe₃Zn₁₀ . The interface forms ternary compound but content of FeAl₃ and Fe₂Al₅ is low when dipping Al-X5 alloy . The compound layer is also made up of FeAl₃ and Fe₂Al₅ when dips Al-Mn and Al-Mg-Si alloy ;(4) The interface grows depending on reaction and diffusion of Fe Al , and Fe and FeAl₃ dissolve in Al liquid in this course . Thickness of interface compound layer and time don't strictly follow the parabola relation of pure diffusion ;(5) The mechanical performances of composites which is manufactured by 6063 alloy and stainless steel fiber are improved . Thickness of interface compound layer is effectively controlled for 9μm . It is flat shape when ruptures, and the integration of interface is very good .The performances of composites will be swingeingly improved by alteration of mould and amelioration of technics, looking forward to applying favorablely in the fields of aviation and aerospace , military industry , automobile , machine , electronic technology and aerial ladder.