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首页> 外文期刊>Journal of Materials Engineering and Performance >Formation and Toughening Mechanisms of Dispersions in Interfacial Intermetallics of Dissimilar Laser Al/Steel Joints
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Formation and Toughening Mechanisms of Dispersions in Interfacial Intermetallics of Dissimilar Laser Al/Steel Joints

机译：不同激光Al /钢接缝界面金属间化学中分散体的形成和增韧机制

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摘要

The key to improve the strength of Al/steel dissimilar joint is to toughen the hard and brittle interfacial intermetallics. Introducing soft and tough dispersions into the interfacial intermetallics would be a promising method. In the present study, Zn-Al alloy (Zn-22Al) was used as the filler metal to generate dispersions in the interfacial intermetallics matrix of dissimilar laser Al/steel joint. The results have shown that soft and tough dispersions, i.e., FeZn10, Al-rich amorphous phase, and Zn solid solution, were successfully introduced into the hard and brittle Fe2Al5-xZnx matrix. The formation of these dispersions was resulted from diffusion of elements Fe and Al and infiltration of liquid Zn along the grain boundaries of Fe2Al5-xZn matrix and the subsequent chemical reaction and solidification. With this kind of interfacial microstructure, the joint exhibited a stable peak fracture load of 1200 N even though the interfacial layer thickness increased from 20 to 45 mu m. This was because the interfacial layer was toughened by the soft and tough dispersions. Using this example, introduction of soft and tough dispersions into hard and brittle intermetallics matrix to toughen interfacial layer and then strengthening of dissimilar joints will be highlighted.
机译：提高Al /钢异种接头强度的关键是强化硬质和脆性的界面金属间金属间化合物。将柔软和坚韧的分散体引入界面金属间化合物将是一个有希望的方法。在本研究中，Zn-Al合金（Zn-22Al）用作填料金属，以在不同激光Al /钢接头的界面金属间质基中产生分散体。结果表明，成功地将柔软且坚韧的分散体，即FeZN10，富含铝的无定形相和Zn固相和Zn固相。这些分散体的形成是由元素Fe和Al的扩散和沿Fe2Al5-XZN基质的晶界和随后的化学反应和凝固的液体锌的渗透。利用这种界面微观结构，即使界面层厚度从20到45μm增加，关节也表现出1200n的稳定峰断裂载荷。这是因为界面层通过柔软和坚韧的分散体而增韧。使用该示例，将柔软的和坚韧的分散体引入硬质和脆性金属间金属基矩阵，以强化界面层，然后突出显示不同关节的强化。

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