Diffusion Welding of Aluminum to Titanium

概要

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Diffusion welding of aluminum to titanium has been performed as an example of the joint between dissimilar metals which form brittle intermetallic compound in the bonding interface. In order to investigate the important factor which affects the joining process and the mechanical property of the joint, the microstructure in the bonding zone and the joint strength were examined in detail. The results obtained are summarized as follows. (1) The joint strength increased with increasing welding temperature and time. The joint welded for more than 30 min at 600℃ was fractured at aluminum base metal on tensile test. (2) The interlayer which consisted of intermetallic compound Al_3Ti was formed in the bonding zone. The thickness of this interlayer increased almost linearly with welding time at the welding temperature of 600℃. The increase in the thickness did not reduce the joint strength up to 10μm at least. (3) The oxide film on the Paying surface of aluminum is considered to be the most important factor for the joining process and joint strength. That is, the joint strength did not increase sufficiently because the oxide film inhibited the formation of metallic bond between the base metals. (4) The joining process proceeded preferentially in the regions where the oxide film was disrupted by the microasperities on the faying surface of titanium.
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