中文摘要：

基于亚点阵计算模型,建立Al/镀锌钢板Pulsed DE-GMAW焊接接头界面区金属间化合物Fe2Al5Znx形成的Gibbs自由能计算模型.利用该模型对Fe2Al5Znx金属间化合物生成的可能性及生成物相种类进行了计算分析,并辅助以实验分析方法对计算结果进行了对比研究.计算结果表明,Al/镀锌钢板Pulsed DE-GMAW焊接接头界面处可以形成Fe-Al-Zn三元化合物相,该化合物相最终稳定于Fe2Al5Zn0.4,且与实验结果一致,由此表明所建立的计算模拟是合理,能够正确反映Al/镀锌钢板Pulsed DE-GMAW焊接界面Fe-Al-Zn金属间化合物的生成情况.通过对界面中心进行元素分布分析得出,Fe2Al5Zn0.4相的生成可分为3个阶段：即液态Al对镀锌层的溶解、Zn元素的扩散迁移、Zn元素与金属间化合物Fe2Al5反应生成Fe2Al5Zn0.4.

英文摘要：

As for the intermetallic compound of Al and galvanized steel welding interface has greatly affect on welding joint, the researchers study the formation mechanism of intermetallic compound at the Al/galvanized steel interface. In order to research on Al/galvanized steel welding joint interface area, Gibbs free energy calculation model of Fe-Al-Zn intermetallic compounds formation was established based on the lattice model. Using the Gibbs free energy calculation model the formation of Fe_2Al_5 Znxintermetallic phase was calculated and analyzed. At the Al/galvanized steel welding interface area, the calculation result was confirmed by experiments. Fe-Al-Zn ternary compound phases were formed at the welding joint interface of Al/galvanized steel. The Fe- Al- Zn compound phases, Fe_2Al_5Zn_（0.4）, was the most stable. The calculation results agreed well with experiment results. It is showed that the calculation model was reasonable and the method was appropriate and feasible. The calculation model could reflect the Fe- Al- Zn intermetallic compound formation at Al/galvanized steel welding joint correctly.Fe_2Al_5Zn_（0.4）phase formation process could be experienced three stages based on the study of element distribution analysis at the interface center. It is also called the galvanized layer was dissolved in liquid Al, the Zn element was diffused, the Fe_2Al_5Zn_（0.4）was generated based on the reaction of Zn element and intermetallic compound Fe_2Al_5.