Al/镀锌钢板焊接界面区Fe-Al-Zn金属间化合物形成的热力学分析<sup>*</sup>

doi:10.11900/0412.1961.2015.00203

金属学报

2016, Vol. 52

Issue (1): 113-119 DOI: 10.11900/0412.1961.2015.00203

本期目录 | 过刊浏览

Al/镀锌钢板焊接界面区Fe-Al-Zn金属间化合物形成的热力学分析^*

陈满骄¹,黄健康¹(

),何翠翠²,石玗¹,樊丁¹

1 兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室, 兰州 730050
2 廊坊燕京职业技术学院机电工程系, 廊坊 065200

THERMODYNAMIC ANALYSIS OF THE FORMATION OF Fe-Al-Zn INTERMETALLIC COMPOUNDS IN Al/GALVANIZED STEEL INTERFACE

Manjiao CHEN¹,Jiankang HUANG¹(

),Cuicui HE²,Yu SHI¹,Ding FAN¹

1 State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China
2 Department of Mechanical and Electrical Engineering, Vocational Technical Institute of Langfang Yanjing, Langfang 065200, China

引用本文:

陈满骄,黄健康,何翠翠,石玗,樊丁. Al/镀锌钢板焊接界面区Fe-Al-Zn金属间化合物形成的热力学分析^*[J]. 金属学报, 2016, 52(1): 113-119.
Manjiao CHEN, Jiankang HUANG, Cuicui HE, Yu SHI, Ding FAN. THERMODYNAMIC ANALYSIS OF THE FORMATION OF Fe-Al-Zn INTERMETALLIC COMPOUNDS IN Al/GALVANIZED STEEL INTERFACE[J]. Acta Metall Sin, 2016, 52(1): 113-119.

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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Fe₂Al₅Zn_x形成的Gibbs自由能计算模型. 利用该模型对Fe₂Al₅Zn_x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Fe₂Al₅Zn_0.4, 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, Fe₂Al₅Zn_0.4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Fe₂Al₅Zn_0.4.

关键词 ： Al/钢焊接, Fe-Al-Zn金属间化合物, 热力学分析

Abstract：

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 Fe₂Al₅Zn_x intermetallic 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, Fe₂Al₅Zn_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. Fe₂Al₅Zn_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 Fe₂Al₅Zn_0.4 was generated based on the reaction of Zn element and intermetallic compound Fe₂Al₅.

Key words： Al/steel welding Fe-Al-Zn intermetallic compound thermodynamic analysis

收稿日期: 2015-04-07

基金资助:国家自然科学基金资助项目51165023

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https://www.ams.org.cn/CN/10.11900/0412.1961.2015.00203 或 https://www.ams.org.cn/CN/Y2016/V52/I1/113

表1 模型中的计算参数[26,27]

图1 x取不同值时Fe2Al5Znx相的标准Gibbs自由能

图2 从焊后接头试样的结合面处撕裂拉开后Al侧和镀锌钢板侧的形貌

图3 Al侧和镀锌钢板侧试样剥落面的XRD谱

图4 Al与镀锌钢熔钎焊焊缝横截面中心界面区的SEM-BSE像及元素面分布图

图5 Fe2Al5晶体结构3D示意图[29]

图6 Fe2Al5Zn0.4金属间化合物形成过程示意图

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