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

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The behavior of jogged screw dislocations in {gamma}-TiAl alloys has 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 jogs in the {+-}[{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 formation of dislocation dipole and loops around the jogs is also observed.

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6 p.

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Chen, K.Y.; Li, M. & Zhou, S.J. March 1, 1999.

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Description

The behavior of jogged screw dislocations in {gamma}-TiAl alloys has 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 jogs in the {+-}[{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 formation of dislocation dipole and loops around the jogs is also observed.

Physical Description

6 p.

Notes

OSTI as DE99001995

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  • Fall meeting of the Materials Research Society, Boston, MA (United States), 30 Nov - 4 Dec 1998

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  • Other: DE99001995
  • Report No.: LA-UR--99-215
  • Report No.: CONF-981104--
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/329543 | External Link
  • Office of Scientific & Technical Information Report Number: 329543
  • Archival Resource Key: ark:/67531/metadc681567

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • March 1, 1999

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • May 20, 2016, 1:02 p.m.

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Chen, K.Y.; Li, M. & Zhou, S.J. Atomistic studies of jogged screw dislocations in {gamma}-TiAl alloys, report, March 1, 1999; New Mexico. (digital.library.unt.edu/ark:/67531/metadc681567/: accessed April 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.