Fatigue and Impact Strength of Diffusion Bonded Titanium Alloy Joints.

摘要

The combination of superplastic forming with solid state diffusion bonding (SPF/DB) has led to new manufacturing routes for airframe structures made in titanium alloys. Significant cost and weight savings are obtained by SPF/DB over conventional structures, but these are dependent on the ability to produce diffusion bonded joints with adequate mechanical properties. Since such joints are not always inspectable it may be necessary to rely on strict control of process parameters to obtain satisfactory and reproducible joints. A vital requirement for the success of the SPF/DB process is therefore an understanding of the factors which affect the mechanical properties of diffusion bonds. In the current work fatigue and impact strengths were determined for butt joints containing various amounts of porosity at the bond interface following diffusion bonding. (KT)