Atomistic studies of jogged screw dislocations in {gamma}-TiAl alloys

Conference · Thu Jul 01 04:00:00 EDT 1999

OSTI ID:20001585

Chen, K Y; Li, M; Zhou, S J

The behavior of jogged screw dislocations in {gamma}-TiAl alloys have been investigated with large-scale molecular dynamics (MD) simulations. The authors find a new mechanism for formation of pinning points in jogged screw dislocations. They also find that the critical height for the logs in {+-}[{bar 1}10] directions on the (001) plane to move nonconservatively is between 3r{sub 0} and 4r{sub 0}, where r{sub 0} is the nearest neighbor distance of aluminum atoms. Interstitials and vacancies are created during the nonconservative motions of the jogs. In addition, the formations of dislocation dipole and loops around the jogs are also observed.

• Research Organization: Los Alamos National Lab., NM (US)
• OSTI ID: 20001585
• Report Number(s): CONF-981104--; ISBN 1-55899-458-0; ISSN 1067-9995
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
INTERMETALLIC COMPOUNDS
INTERSTITIALS
MICROSTRUCTURE
MOLECULAR DYNAMICS METHOD
SCREW DISLOCATIONS
SIMULATION
THEORETICAL DATA
TITANIUM ALLOYS
VACANCIES