Abstract
The effect of residual stress on the strength of an alumina-steel joint with the Al-Si interlayer was studied. Alumina rods, 32 mm in diameter and 9 mm in length and steel pipes were diffusion bonded at 873 K and at a contact pressure of about 5 M Pa for 30 min in a vacuum of 2∼4×10−2Pa. The interlayer of aluminium sheet clad with Al-10% Si alloy on both sides was used. The tensile strength of the joints is influenced by the thickness of the interlayer or the intermetallic compound formed between the interlayer and the steel. The strength increases with increasing interlayer thickness and with decreasing intermetallic compound thickness. It is found that the residual stress measured by Sachs method is much lower than that by the elastic calculation. The stress decreases with increasing interlayer thickness. Increase in thickness of the aluminium core of the interlayer is effective in improving the joint strength. This improvement can be explained by considering the stress of the joint.
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Yamada, T., Yokoi, K. & Kohno, A. Effect of residual stress on the strength of alumina-steel joint with Al-Si interlayer. J Mater Sci 25, 2188–2192 (1990). https://doi.org/10.1007/BF01045788
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DOI: https://doi.org/10.1007/BF01045788