铝铁复合铸造界面金相研究  

Metallographic Study of Interface Achieved by Aluminum-iron Compound Casting

作　　者：李文钊[1] 边秀房[1] 

机构地区：[1]山东大学材料液固结构演变与加工教育部重点实验室,济南250061

出　　处：《机械工程学报》2011年第16期67-72,共6页Journal of Mechanical Engineering

摘　　要：为用铸造方法得到铝铁复合线材,降低铝包钢芯铝绞线的生产成本而设计试验。自行设计复合铸造模具,在洁净的铁丝表面预先进行渗铝处理300 s,用出炉温度在800℃的铝液浇注试样,通过金相显微镜和扫描电子显微镜观察发现:铝和铁的界面处形成宽度为10～30μm的结合区域,能谱分析结果表明其中铝的质量分数为50.37%,原子分数为67.75%。由元素质量分数和相关热力学数据判定结合区主要由Fe2Al5和FeAl构成,其显微硬度值在250 HV以上。相同浇注温度下未经渗铝处理得到的试样,通过金相观察、能谱分析和显微硬度测试,证实铝和铁间形成宽度为10μm的缝隙。试验结果说明,采用预先浸镀后浇注的工艺可以实现铝和铁的冶金结合,为实现铸造工艺得到铝铁复合线材的构想提供初步的支持。In order to get aluminum-iron composite wire through casting and to reduce the cost of ACSR/AC（aluminum conductor aluminum clad steel reinforced）,the process of aluminum-iron compound casting is proposed.In this experiment,the solid iron wire is dipped into liquid aluminum for 300 s and then liquid aluminum of 800 ℃ is cast around it through the casting mould specially designed casting mold.A cohesion area 10～30 μm composed by aluminum and iron is achieved after this process in which the aluminum content can be up to 67.75 percent.Meanwhile,the microhardness is over HV250.The cohesion area is mainly composed of Fe2Al5 and FeAl according to thermodynamic data.In contrast,without the hot dipping treatment,a 10 μm wide gap between the two metals is observed by means of scanning electron microscope and verified by results of energy spectrum analysis and microhardness test.The results suggest that a metallurgical interface is achieved between aluminum and iron via casting,which contribute to the investigation of producing aluminum-iron composite wire by casting.

关 键 词：双金属铸造 冶金结合界面 铝液 铁基体 

分 类 号：TG249[金属学及工艺—铸造]