Bonding interfaces of friction- and explosive-welded aluminum-titanium joints, before and after annealing for 1h at temperatures between 723 and 923K, were examined by tensile test for bonding strength, and by optical and electron micrographies, and EPMA for phases in interfacial reaction-layers. Results obtained are as follows:
(1) Bonding strength of both friction- and explosive-welded joints in the as-welded and annealed states is higher than the tensile strength of aluminum matrix in each specimen. Thus, fracture occurs in the aluminum matrix.
(2) The interfacial reaction layer consists of only Al
3Ti in the case of friction-welded joint, and Al
3Ti and AlTi in the explosive-welded joint.
(3) These phases are so stable that the thickness of the layer is kept almost the same by the annealing.
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