DIFFUSION BONDING OF TITANIUM ALLOYS.
Abstract
Using the alloy Ti-6Al-4V as a reference, the program aims at a basic understanding of the solid state bonding of titanium alloys. During the first year, tests were performed to determine shear, tensile and bend strengths of bonded joints for a wide range of bonding conditions. For the range of conditions examined, it has been tentatively concluded that the order of events in bonding is as follows: (1) Surface contaminants diffuse into the bulk alloy leaving clean surfaces. (2) Plastic flow occurs, closing the voids at the bond line and bringing the surfaces of the joint into intimate contact. (3) The bond attains its final strength through nucleation and growth of grains across the bond interface. A number of specific conclusions have emerged from the program, namely: (1) A shear test coupled with metallographic examination gives an effective index of bond quality. (2) Ultra-high vacuum appears to be unnecessary in producing good bonds in Ti-6Al-4V. (3) The strength of the diffusion bond may closely approach that of the parent alloy. (4) the bonding process does not weaken the parent alloy. (5) The principal variables observed to correlate with bond quality are time, surface finish, and permanent deformation. (6) The relative independence of bond quality of pressure and temperature allows a wide choice on bonding conditions for Ti-6Al-4V. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1967
- Accession Number
- AD0670940
Entities
People
- Curtiss A. Smith
- Edward L. Reed