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In this paper, a series of Al/Ti multilayers with different modulation periods were used in copper and Al 2 O 3 ceramic diffusion bonding. The reactive multilayer was deposited by DC magnetron sputtering, and the diffusion bonding experiments were performed at 900 C for 10 min with a pressure of 5 MPa. The interfacial joints were inspected by scanning electron microscopy (SEM), energy dispersive x-ray spectroscopy (EDS), X-ray diffraction and tensile shear tests. As a result, no signi cant metallurgical defect was observed in the microstructures of the joints. The formation of several intermetallic compounds at the interface, such as Cu/Ti eutectic and Al 2 O 3-X ·TiO compound, has further con rmed the success of Cu-Al 2 O 3 bonding as compared to the Al/Ni nano-multilayers, which use Al/Ti nano-foils as interlayer for diffusion bonding to bring more bene t to the quality of cermet joint.

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The internal residual stress in the narrow inertia friction welding (IFW) welds of FGH96 nickelbased superalloy was measured with the contour method (CM). The as-welded internal hoop and axial residual stresses were obtained after two cuts and the detailed steps of the CM measurement were described. In addition, the hole-drilling method was used to obtain the surface stress. Furthermore, the internal hoop residual stress of a FGH96 superalloy IFW specimen after post-weld heat treatment (PWHT) was also measured with the CM after a single cut. The measured results show that the peak hoop residual stress is not symmetrical about the weld centreline. Axial residual stress on the outer surface at the weld centreline is compressive stress, while tensile stress appears on the inner surface, and it varies linearly along the thickness. The peak values of hoop tensile and compressive stresses decrease dramatically after PWHT.

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