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Effects of interlayer metal on microstructures and mechanical properties of friction stir lap welded dissimilar joints of magnesium and aluminum alloys
Journal of Materials Processing Technology ( IF 6.3 ) Pub Date : 2021-09-09 , DOI: 10.1016/j.jmatprotec.2021.117362
Pai Peng 1, 2 , Wen Wang 1 , Ting Zhang 1 , Qiang Liu 1 , Xiaohu Guan 1 , Ke Qiao 1 , Jun Cai 1 , Kuaishe Wang 1
Affiliation  

The content of intermetallic compounds (IMCs) in friction stir lap welded (FSLW) dissimilar joints of Mg and Al alloys could be reduced by the addition of interlayer metal to improve the mechanical properties of the joints, while the underlying mechanism is still unclear. In this study, Cu and Ni powders are added as the interlayer materials into the FSLW joints of AZ31 Mg alloy and Al–Zn–Cu–Mg alloy, respectively. The types, sizes, and distributions of IMCs have been characterized, and the shear properties of the joints have been evaluated. Moreover, the mechanism underlying the influence of the interlayer metals on the evolution of IMCs in the joints and the effect of IMCs on the shear properties of the joints have been studied. The results showed that the order of phase formation in the joint without interlayer was Al12Mg17, Al3Mg2, MgZn2, CuMg2, Al2Cu, while the order of phase formation in the joint with added Cu interlayer was Al2Cu, CuMg2, AlCu, Al12Mg17, Al3Mg2, Cu5Zn8, and that in the joint with added Ni interlayer was Mg2Ni, Al3Ni, Al3Ni2, MgNi2, AlNi, Al12Mg17, Al3Mg2, MgZn2, Ni3Zn22, NiZn, Al2Cu. Due to the formed physical barrier and the mechanism of phase formation, the addition of interlayer metal effectively inhibited the formation of a Mg–Al phase. The bonding strengths between Mg–Cu, Al–Cu, Al–Ni, and Mg–Ni phases and matrix were higher than that between Mg–Al phase and matrix, which improved the shear properties of the joints with Cu and Ni interlayers.



中文翻译:

夹层金属对搅拌摩擦搭接焊接镁铝合金异种接头组织和力学性能的影响

加入层间金属可以降低镁合金和铝合金的搅拌摩擦搭接焊接(FSLW)异种接头中金属间化合物(IMCs)的含量,以提高接头的力学性能,但其潜在机制尚不清楚。在本研究中,分别将 Cu 和 Ni 粉末作为夹层材料添加到 AZ31 Mg 合金和 Al-Zn-Cu-Mg 合金的 FSLW 接头中。已经表征了 IMC 的类型、尺寸和分布,并评估了接头的剪切性能。此外,还研究了夹层金属对接头中 IMC 演变的影响机制以及 IMC 对接头剪切性能的影响。结果表明,无夹层接头的相形成顺序为Al 12Mg 17 , Al 3 Mg 2 , MgZn 2 , CuMg 2 , Al 2 Cu, 而加入中间层的接头中的相形成顺序为Al 2 Cu, CuMg 2 , AlCu, Al 12 Mg 17 , Al 3 Mg 2 , Cu 5 Zn 8 , 加入Ni夹层的接头为Mg 2 Ni, Al 3 Ni, Al 3 Ni 2 , MgNi 2 , AlNi, Al 12 Mg 17 , Al 3 Mg 2、MgZn 2、Ni 3 Zn 22、NiZn、Al 2 Cu。由于形成的物理屏障和相形成机制,层间金属的加入有效地抑制了 Mg-Al 相的形成。Mg-Cu、Al-Cu、Al-Ni 和 Mg-Ni 相与基体之间的结合强度高于 Mg-Al 相与基体之间的结合强度,这提高了具有 Cu 和 Ni 夹层的接头的剪切性能。

更新日期:2021-09-27
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