Abstract

Two dissimilar alloys Al 5083 and Mg-AZ31 were diffusion bonded using two different interlayer applying methods, where the interlayer was 30 µm pure silver foil and 4 µm physical vapor deposited silver on Al and Mg substrates. The optimized variables used in diffusion bonding processes were holding time of 60 min and bonding temperature of 470 °C. The X-ray diffraction results confirmed the formation of Mg–Ag, Ag–Zn, and Ag–Al phases namely: MgAg, AgZn, Ag₅Zn₈, and Ag₂Al instead of Al–Mg intermetallics at the interface. This proves the effective role of Ag, as a diffusion barrier and its success in minimizing the formation of harmful intermetallic phases at the interface. The joint with silver PVD coat, as interlayer, gave the higher shear strength of 31.6 MPa.

Graphic Abstract

中文翻译：

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银中间层对铝镁合金的物理气相沉积辅助扩散键合

摘要

使用两种不同的中间层涂覆方法将两种异种合金Al 5083和Mg-AZ31扩散结合，其中中间层是在Al和Mg衬底上的30 µm纯银箔和4 µm物理气相沉积银。扩散结合过程中使用的最佳变量是保持时间为60分钟，结合温度为470°C。X射线衍射结果证实了Mg-Ag，Ag-Zn和Ag-Al相的形成：MgAg，AgZn，Ag ₅ Zn ₈和Ag ₂在界面处用Al代替Al–Mg金属间化合物。这证明了银作为扩散阻挡层的有效作用，并成功地减少了在界面处有害金属间相的形成。以银PVD涂层作为中间层的接缝具有31.6 MPa的较高剪切强度。

图形摘要