Origin of dramatic oxygen solute strengthening effect in titanium
Abstract
The motion of dislocations or defects in a metal influences its strength and toughness. If these defects can be “pinned” by adding alloying elements, it should be possible to create a stronger alloy. It was thought that there shouldn't be much of an interaction between screw dislocations and any alloying elements. However, Yu et al. show that for α-Ti, the profound hardening effect of oxygen is due to the strong interactions with the core of the dislocations. First-principles calculations reveal that distortion of the interstitial sites at the dislocation core creates a very strong but short-range repulsion for oxygen atoms.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Feb 06, 2015
- Source ID
- 10.1126/science.1260485
Entities
People
- Andrew M. Minor
- D. C. Chrzan
- David Rugg
- J. W. Morris Jr.
- Liang Qi
- Mark Asta
- Qian Yu
- Rachel Traylor
- Tomohito Tsuru
Organizations
- Office of Naval Research
- United States Department of Energy
- University of California