Effect of Superplastic Deformation on the Surface Roughness of Sheet
Abstract
SPF/DB 1 involves in situ diffusion bonding after the sheet has undergone large superplastic strain. Bond quality depends primarily on precise process control which is based upon the forming and bonding parameters. Surface roughness is one of the most important parameters affecting solid state bonds since in practice increased surface roughness requires an increase in the bonding time. Plastic deformation is known to increase the surface roughness of CP titanium sheet, but although an increase in surface roughness has been reported during superplastic deformation of Titanium-alloy sheet, no roughness measurements were made. Ra values have therefore been determined for titanium and aluminum alloy sheets before and after SPF and are reported in this paper. Their significance for forming and bonding of sheet is discussed.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1988
- Accession Number
- ADA203614
Entities
People
- D. V. Dunford
- P. G. Partridge
Organizations
- Royal Aircraft Establishment