Abstract
Microstructural fatigue crack growth in Ti–6Al–4V lamellar colonies was examined using small compact-tension specimens, with post-fatigue-test transmission electron microscopy for a mechanistic understanding of the anisotropy. In colonies oriented favourably for prismatic slip in the α phase, the crack grew by alternating shearing on two symmetrically arranged prismatic slip planes (unzipping process). Interlamellar decohesion along the α/β interface significantly increased the crack growth rate, which depended on the lamellar orientation. When the colony was loaded along [0001], deflected crack growth was accompanied by basal slip and < c + a > pyramidal slip gliding, and the crack growth rates slightly exceeded those during unzipping.
Original language | English |
---|---|
Pages (from-to) | 107-111 |
Number of pages | 5 |
Journal | Scripta Materialia |
Volume | 165 |
Early online date | 23 Feb 2019 |
DOIs | |
Publication status | Published - 1 May 2019 |
Keywords
- Deformation structure
- Fatigue
- Micro-mechanical test
- Slip
- Titanium alloys
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys