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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.
Based on the sub-lattice calculation model, a Gibbs free energy model for the formation of intermetallic Fe2Al5Znx in the interface of the welded interface of Al / galvanized steel was established. The possibility of formation of Fe2Al5Znx intermetallic compounds The experimental results show that Fe-Al-Zn ternary compound phase can be formed at the interface of Pulsed DE-GMAW welded joint of Al / galvanized steel, and the compound Phase is stable to Fe2Al5Zn0.4, and is in good agreement with the experimental results, which shows that the calculated simulation is reasonable and can correctly reflect the formation of Fe-Al-Zn intermetallic compounds in the interface of Pulsed DE-GMAW welded Al / galvanized steel Through the analysis of the elemental distribution of the interface center, the formation of Fe2Al5Zn0.4 phase can be divided into three stages: the dissolution of the zinc coating by the liquid Al, the diffusion and migration of the Zn element, the reaction of the Zn element with the intermetallic compound Fe2Al5 Fe2Al5Zn0.4.