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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers. Part L, Journal of Materials: Design and Application >Investigation on the coupling interaction in electron beam welded Al-Cu bimetallic sheet
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Investigation on the coupling interaction in electron beam welded Al-Cu bimetallic sheet

机译：电子束焊接Al-Cu双金属板耦合相互作用的研究

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摘要

Two sound joints of Al-Cu bimetallic sheet with 6.5 mm in thickness were obtained in Cu (upper)-Al (lower) and Al (upper)-Cu (lower) welding configurations via the electron beam welding and their distinct coupling models were developed to well understand their flow behavior of the molten pool and microstructure evolution mechanisms during the electron beam welding. For the electron beam welding of the Cu-Al bimetallic sheet, liquid Al and Cu flowed into each other and fully combined in the fusion zone and the interface zone under high-temperature environment, forming large amount of intermetallic compounds. For the electron beam welding of the Al-Cu bimetallic sheet, liquid Al was floating on the Cu substrate, while liquid Cu was flowing at the bottom of the molten pool and mutually combined with liquid Al at the interface, forming a relatively small amount of intermetallic compounds. Moreover, a part of liquid Al flowed back to the seam root under the influence of the Marangoni effect. Therefore, the fusion zone and the interface zone with various phase compositions were formed in these two Al-Cu bimetallic joints and the mechanical properties of the corresponding joints were determined. Furthermore, the average tensile strengths of Cu-Al and Al-Cu bimetallic joints were 59 MPa and 67 MPa, respectively. The fracture locations of these two joints were both at the edge of the fusion zone along the Al2Cu intermetallic compound interlayer. Moreover, the fracture characteristics of these joints were mainly cleavage fracture.
机译：在Cu（上） - 厚度为6.5mm的Al-Cu双金属片的两个声音接头，通过电子束焊接，开发了它们不同的耦合模型为了良好地了解电子束焊接期间熔池和微观结构演化机构的流动。对于Cu-Al双金属片的电子束焊接，液体Al和Cu彼此流入并在高温环境下完全组合在融合区和界面区，形成大量的金属间化合物。对于Al-Cu双金属片的电子束焊接，液体Al漂浮在Cu底物上，而液体Cu在熔池底部流动，并在界面相互结合液体，形成相对少量的液体金属间化合物。此外，液体Al的一部分在Marangoni效应的影响下流回接缝根。因此，在这两个Al-Cu双金属关节中形成融合区和具有各种相组合物的界面区，并测定相应接头的机械性能。此外，Cu-Al和Al-Cu双相接头的平均抗拉强度分别为59MPa和67MPa。这两个关节的断裂位置沿Al2Cu金属间化合物中间层沿融合区的边缘。此外，这些关节的断裂特性主要是切割骨折。

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