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针对Al/镀Zn钢板Pulsed DE-GMAW焊接接头界面区金属间化合物相的确定性研究,在热力学基本定律的基础上,建立铝/镀锌钢板异种金属焊接接头界面Fe-Al-Zn相形成的吉布斯自由能变化的计算模型,得到Al/镀Zn钢板异种金属焊接接头Fe_2Al_5Zn_(0.4)金属间化合物相形成的标准吉布斯自由能与温度的变化关系,分析界面Fe_2Al_5Zn_(0.4)金属间化合物存在的可能性,并与焊接试验结果进行对比分析。模拟结果表明:所建立的热力学模型是合理的,在界面上形成Fe_2Al_5Zn_(0.4)金属间化合物,与试验结果基本一致,并推论了Fe_2Al_5Zn_(0.4)是在Fe_2Al_5与FeAl_3形成后,由于Zn扩散进入Fe_2Al_5的晶体空位所得到的。
Aiming at the deterministic study of the intermetallic compound phase in the interface of the pulsed DE-GMAW welded joint of Al / Zn steel plate, based on the basic laws of thermodynamics, the formation of Fe-Al-Zn phase in the interface of the dissimilar metal welded joint of aluminum / Gibbs free energy of the Gibbs free energy to change the model obtained by dissimilar metal welded joints Al / Zn steel Fe 2 Al_5Zn_ (0.4) intermetallic compound phase Gibbs free energy and temperature changes in the relationship between the analysis of the interface Fe_2Al_5Zn_ (0.4) intermetallic The possibility of compounds exists, and compared with the welding test results. The simulation results show that the established thermodynamic model is reasonable and the intermetallic compound Fe 2 Al 5 Zn 0.4 is formed at the interface, which is consistent with the experimental results. It is deduced that Fe 2 Al 5 Zn 0.4 is formed after Fe 2 Al 5 and FeAl 3 diffused into Fe_2Al_5 crystal vacancy obtained.