渗铝液Fe含量对镶圈铝合金活塞铝铁结合区的影响  

Effect of Fe content of aluminized liquid on Al-Fe bonding layer of piston with reinforced cast iron ring

作　　者：孙兰[1,2] 贺跃辉[1] 

机构地区：[1]中南大学粉末冶金研究院,长沙410083 [2]四川大学制造科学与工程学院,成都610065

出　　处：《粉末冶金材料科学与工程》2012年第5期645-649,共5页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金资助项目(51071178;50825102)

摘　　要：研究不同Fe含量的渗铝液成分对镶嵌活塞铁铝粘结层的组织及性能的影响,采用金相显微镜及扫描电镜观察结合区的组织形貌,采用显微硬度计及压力机测定结合区的硬度和粘接强度。结果表明:活塞铝铁结合区的形成包括铝原子向铸铁环的扩散及铁原子向铝基体的溶解过程;结合区主要由Fe2Al5相和FeAl3相组成;渗铝液中铁含量增加时,铝铁结合层厚度明显下降;结合区硬度显著高于高镍铸铁环及铝合金活塞基体,且随渗铝液铁含量增加,结合区硬度较高;结合层粘接强度随渗铝液铁含量的增加,呈先增后减的趋势。The effect of the different Fe contents in the aluminized liquid on the Al-Fe bonding layer of the piston was investigated.The binding microstructure was observed by optical microscope and scanning electron microscopy.The hardness and the bond strength of the Al-Fe zone were measured by micro hardness tester and universal tensile testing machine,respectively.The results show that the formation of Al-Fe bonding layer of the piston includes two processes of the diffusion of aluminum atoms to the iron ring and the dissolution of iron atoms to the aluminum body.The main bonding zone phases are FeAl3 and Fe2Al5 phase.With the increase of the iron content in molten aluminum liquid,the thickness of bonding layer decreases.The hardness of the Al-Fe bonding zone is significantly higher than the matrix.With the increase of iron content in molten aluminum liquid,the hardness of bonding layer increases.Meanwhile,the bonding strength increases and then decreases with increasing iron content.

关 键 词：镶圈活塞 渗铝 铝铁结合区 铁含量 

分 类 号：TK243.1[动力工程及工程热物理—动力机械及工程]