铁/铝扩散偶界面反应层生长机理分析

吴铭方; 司乃潮; 王敬; 王凤江

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铁/铝扩散偶界面反应层生长机理分析
吴铭方^1,2, 司乃潮¹, 王敬², 王凤江²
1.江苏大学材料科学与工程学院, 江苏镇江 212013;2.江苏科技大学材料科学与工程学院, 江苏镇江 212003

摘要:

在不同的加热温度和保温时间条件下,对铁/铝扩散偶的元素扩散特征和界面反应层形成机理进行了探讨.结果表明,保温时间较短,界面结构为纯铁/FeAl_x+Al/FeAl/纯铝,保温时间超过某一临界值,不稳定的FeAl_x、准稳定的FeAl将转化为稳定的Fe₂Al₅和FeAl₃金属间化合物,最终界面反应层结构为纯铁/Fe₂Al₅+FeAl₃/纯铝.界面反应层生长满足抛物线法则,即反应层生长速率受控于Fe原子向铝侧界面的扩散速率.研究成果对于提高铝合金与不锈钢焊接接头质量及对焊接过程进行实时监控具有一定意义.

关键词: 纯铁纯铝扩散反应界面结构

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基金项目:江苏省研究生创新计划资助项目(CX08S_008Z)

Analysis on growth mechanism on interfacial interlayer on Fe/Al couple

WU Mingfang^1,2, SI Naichao¹, WANG Jing², WANG Fengjiang²

1.School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China;2.School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003

Abstract:

To understand the formation mechanism and growth behavior of Fe-Al intermetallics,the element diffusion and interfacial reactive interlayer in Fe/Al couple were studied at the different heating temperature and holding time.The interfacial structure is Fe/FeAl_x+Al/FeAl/Al at the shorter holding time,while the unstable FeAl_x and FeAl will change into the stable Fe₂Al₅ and FeAl₃ intermetallics at a longer holding time.The final interfacial structure was Fe/Fe₂Al₅+FeAl₃/Al.The growth of interfacial reactive layer follows the parabolic rule,and its rate is controlled by the diffusion rate of Fe atoms into Al side.The results are helpful to improve the bonding quality between aluminum alloys and stainless steel.

Key words: Fe Al diffusion interfacial structure