The nature of solid state joint formation under superplasticity and some practical application of this phenomenon
- Inst. for Metals Superplasticity, Ufa (Russian Federation)
The effect of superplasticity (SP) on the solid state weldability in two-phase titanium alloys and TiAl intermetallic compound has been investigated. The obtained data of fundamental investigations show that the acceleration of solid state joint (SSJ) formation in SP state is attributed to the influence of grain boundary sliding (GBS). On the basis of the phenomenon revealed the successful experiments on solid state bonding under SP conditions at 850 C in submicrocrystalline TiAl intermetallic compound are performed. It is established that combining of superplastic forming with subsequent diffusion bonding (SPF/DB) results in the occurrence of roughness and especially waveness on bonded surfaces. Their nature is explained by GBS development and they are favorable for providing superplastic deformation which is necessary for formation of a solid state joint.
- OSTI ID:
- 194205
- Report Number(s):
- CONF-950201--; ISBN 0-87339-300-7
- Country of Publication:
- United States
- Language:
- English
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