THE RELATIONSHIP BETWEEN PLASTIC DEFORMATION AND FRACTURE IN ALPHA TITANIUM.
Abstract
Crack initiation and propagation behavior was studied in unalloyed titanium containing between 0.25 and 0.6% oxygen and in Ti-5Al-2.5Sn alloy containing between 0.07 and 0.37% oxygen. Large-grained tensile specimens were tested at -320 F and metallographically examined to identify the mechanism of microcrack formation. Precracked single edge notched specimens were tested at -320 F in order to relate crack propagation events to fracture energy and grain orientation. Second order twin induced microcracking, which is responsible for brittle behavior in unalloyed titanium at 0.25% oxygen, becomes restricted at 0.5 and 0.6% oxygen. In Ti-5Al-2.5Sn alloy containing 0.3% oxygen, slip induced microcracks form in addition to twin induced microcracks. A general correlation was found between fracture energy, grain orientation and crack propagation events in unalloyed titanium containing 0.25 to 0.6% oxygen. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1966
- Accession Number
- AD0488129
Entities
People
- E. A. Steigerwald
- M. F. Amateau