Diffusion bonding properties of Ti-4.5mass%Al- 3mass%V-2mass%Fe-2mass% Mo alloy

摘要

Studies of diffusion bonding were made for Ti-4.5Al-3V-2Fe-2Mo alloy sheets. The process conditions ofpressure, temperature and time required to produce a mechanicallysound bond were investigated for several surface finishes. Theintegrity of the bonds was evaluated using optical metallography,shear strength measurements and fractography. Sound bonds wereproduced in the pickled sheets in 4 h with an applied stress of2.0Mpa at 800℃. In the polished sheets, the time and thetemperature required were reduced to 2h and 775℃, respectively,at the same stress. It was revealed that diffusion bonding of Ti-4.5Al-3V-2Fe-2Mo is attained around the same temperatures asthose for its superplastic forming. A cellular panel wassuccessfully produced with this alloy, combining its lowtemperature superplastic forming and diffusion bonding processes.