About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Advances in Titanium Technology
|
Presentation Title |
Cottrell Atmospheres around Screw Dislocations in alpha-Ti Alloys |
Author(s) |
Eric Wilson Rothchild, Siying Li, Daryl C. Chrzan, David Jany |
On-Site Speaker (Planned) |
Eric Wilson Rothchild |
Abstract Scope |
Generally, solute atoms interact with screw dislocations in HCP materials via contact interaction or by changing the relative stacking fault energies of possible slip planes. In simulations of HCP Ti, however, oxygen interstitials are shown to have a long-ranged interaction with the 〈a〉-type screw dislocation. While no interaction between a perfect screw dislocation and a point source of dilation is predicted by linear elasticity theory, the〈a〉-type screw dislocations in Ti may spread on multiple possible slip planes. Here we present a simple analysis that shows how dislocation core spreading can lead to a substantial linear elastic interaction between the dislocation and interstitial. As core structure controls dislocation dynamics, these interactions have profound consequences for the mechanical behavior of the alloy. |
Proceedings Inclusion? |
Planned: |
Keywords |
Computational Materials Science & Engineering, Titanium, Mechanical Properties |