Abstract
Metastable β Ti alloys are becoming increasingly competitive in the aircraft industry, while the study on diffusion bonding of this type of Ti alloy has been rarely reported up to now. Diffusion bonding of TC4/TB5 alloys with and without pure Ti foil interlayer was carried out to fabricate laminates and analyze the microstructural evolution and mechanical properties. This study reports the first-hand finding on β grains characterized by dendritic morphology at the TC4/Ti/TB5 interface, which results from retained phase due to the asynchronous precipitation and growth of α grains instead of β grains growth. In addition, there are two kinds of α precipitates from β matrix complying with the Burgers orientation relationship at the bonded interface, which is related to the two kinds of α→β phase transformations during heating. The bonded interfaces with fine α and β laths give rise to positive function to the hardness and tensile strengths of the laminated TC4/TB5 alloys.
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