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首页> 外文期刊>Materials Science and Engineering >Intermetallic compounds: Formation mechanism and effects on the mechanical properties of friction stir lap welded dissimilar joints of magnesium and aluminum alloys
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Intermetallic compounds: Formation mechanism and effects on the mechanical properties of friction stir lap welded dissimilar joints of magnesium and aluminum alloys

机译：金属间化合物：形成机理和对摩擦搅拌液焊接镁和铝合金机械性能的影响

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摘要

The formation mechanism of intermetallic compounds (IMCs) during dissimilar friction stir lap welding (FSLW) of Mg and Al alloys, as well as the effects of IMCs on the shearing properties of FSLW joints, are still ambiguous and require clarification. In this study, FSLW dissimilar joints of AZ31 Mg alloys and Al-Zn-Cu-Mg alloys are investigated to clarify the formation mechanism of IMCs and their effect on the joint strength. Microstructures and shearing properties of the joints are characterized. The results showed that new phases of Al_(12)Mg_(17), Al_3Mg_2, MgZn_2, and Al_2Cu are generated at the welding interface, and the original Cu_2Mg phase is dissolved into the Al matrix during FSLW. Furthermore, the formation sequence of IMCs in the same binary system is affected by the effective enthalpy of formation, while it is related to the element concentrations in different binary systems. The order of IMC formation is as follows: Al_(12)Mg_(17), Al_3Mg_2, MgZn_2, and Al_2Cu. During shearing deformation of the FSLW joint, the crack is initiated at the hook zone in the retreading side and propagated along the welding interface, where IMCs aggregate and the strain concentrates. The small lattice mismatch between the IMCs and the matrix improves their interfacial bonding strength, which increases in the following order: Al_(12)Mg_(17) and Al, Al_(12)Mg_(17) and Mg, Al_3Mg_2 and Al, Al_3Mg_2 and Mg, MgZn_2 and Al, MgZn_2 and Mg, Al_2Cu and Al, Al_2Cu and Mg, Cu_2Mg and Mg, and Cu_2Mg and Al.
机译：Mg和Al合金不同摩擦搅拌圈焊接（FSLW）期间金属间化合物（IMC）的形成机制，以及IMC对FSLW关节剪切性能的影响，仍然模棱两可，需要澄清。在该研究中，研究了AZ31mg合金的FSLW异种接头和Al-Zn-Cu-Mg合金，以阐明IMC的形成机制及其对关节强度的影响。表征关节的微观结构和剪切性能。结果表明，在焊接界面处产生Al_（12）Mg_（17），AL_3MG_2，MGZN_2和AL_2CU的新相，并且在FSLW期间将原始CU_2MG相溶解在Al矩阵中。此外，相同二元系统中的IMC的形成序列受到形成的有效焓的影响，而其与不同二元系统中的元素浓度有关。 IMC形成的顺序如下：AL_（12）MG_（17），AL_3MG_2，MGZN_2和AL_2CU。在FSLW接头的剪切变形期间，裂缝在转换侧的钩区发起并沿焊接界面传播，其中IMCS骨料和应变浓缩物。 IMC和基质之间的小晶格不匹配改善了它们的界面键合强度，其按以下顺序增加：Al_（12）Mg_（17）和Al，Al_（12）Mg_（17）和Mg，Al_3mg_2和Al，Al_3mg_2和Mg，MgzN_2和Al，MgZN_2和Mg，Al_2Cu和Al，Al_2Cu和Mg，Cu_2mg和Mg，以及Cu_2mg和Al。

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  • 来源
    《Materials Science and Engineering》 |2021年第20期|140554.1-140554.12|共12页
  • 作者

    Pai Peng; Kuaishe Wang; Wen Wang; Tao Yang; Qiang Liu; Ting Zhang; Shengyi Zhang; Jun Cai; Ke Qiao; Liqiang Wang; Hongduo Wang; Jian Liu;

  • 作者单位

    School of Metallurgical Engineering National and Local Joint Engineering Research Center for Functional Materials Processing Xi'an University of Architecture and Technology Xi'an 710055 China;

    School of Metallurgical Engineering National and Local Joint Engineering Research Center for Functional Materials Processing Xi'an University of Architecture and Technology Xi'an 710055 China;

    School of Metallurgical Engineering National and Local Joint Engineering Research Center for Functional Materials Processing Xi'an University of Architecture and Technology Xi'an 710055 China;

    School of Metallurgical Engineering National and Local Joint Engineering Research Center for Functional Materials Processing Xi'an University of Architecture and Technology Xi'an 710055 China;

    School of Metallurgical Engineering National and Local Joint Engineering Research Center for Functional Materials Processing Xi'an University of Architecture and Technology Xi'an 710055 China;

    School of Metallurgical Engineering National and Local Joint Engineering Research Center for Functional Materials Processing Xi'an University of Architecture and Technology Xi'an 710055 China;

    School of Metallurgical Engineering National and Local Joint Engineering Research Center for Functional Materials Processing Xi'an University of Architecture and Technology Xi'an 710055 China;

    School of Metallurgical Engineering National and Local Joint Engineering Research Center for Functional Materials Processing Xi'an University of Architecture and Technology Xi'an 710055 China;

    School of Metallurgical Engineering National and Local Joint Engineering Research Center for Functional Materials Processing Xi'an University of Architecture and Technology Xi'an 710055 China;

    State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai 200240 China;

    School of Metallurgical Engineering National and Local Joint Engineering Research Center for Functional Materials Processing Xi'an University of Architecture and Technology Xi'an 710055 China;

    Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China;

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  • 关键词

    Friction stir lap welding; Dissimilar metals; Magnesium and aluminum alloys; Microstructure; Intermetallic compound; Interfacial bonding strength;

    机译：摩擦搅拌圈焊接;不同的金属;镁和铝合金;微观结构;金属间化合物;界面粘合强度;

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