Isostatic diffusion bonding of superplastic Ti6Al4V

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Studies of isostatic diffusion bonding have been made for Ti6Al4V sheet material. The process conditions of pressure, temperature and time required to produce a mechanically sound bond have been determined for two surface finishes. The integrity of the bonds was assessed using optical metallography, lap shear strength measurements and fractography. The experimentally determined bonding times were compared with those predicted by a theoretical model for isostatic diffusion bonding, and a discrepancy between theory and experiment was observed. However, it was noted that the collapsing interfacial voids were predominantly ellipsoidal in shape rather than cylindrical as assumed in the model. When the model was modified, experiment and prediction showed good agreement. © 1992.

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Materials Science and Engineering A