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Title: Strengthening and microstructure modification associated with moving twin boundaries in hcp metals

Abstract

The interaction of a moving {1012} twin boundary (TB) with clusters of self-interstitial atoms and vacancies, containing up to 35 point defects, has been studied by atomic computer simulation in a model crystal of hcp Zr. Conservative movement of the boundary has been achieved by glide of twinning dislocations under applied shear stress. Several reactions were observed, the result depending on cluster orientation and location relative to the glide plane of the twinning dislocation, i.e. tension or compression region. They included 1) restriction of TB mobility; 2) change of cluster orientation and shape; 3) glissile cluster drag by the TB without contact; and 4) total or partial absorption of a cluster by the TB and cluster drag, together with simultaneous glide along the TB. It is concluded that the applied shear stress for motion of TBs is raised by interaction with point defect clusters. Furthermore, moving TBs act as defect sinks or recombination centres and provide a means for removing defects from regions of radiation damage.

Authors:
 [1];  [2];  [3]
  1. Universitat Politecnica de Catalunya
  2. University of Liverpool
  3. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
958785
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Philosophical Magazine Letters; Journal Volume: 87; Journal Issue: 7
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION; ATOMS; COMPRESSION; COMPUTERIZED SIMULATION; DEFECTS; DISLOCATIONS; MICROSTRUCTURE; MODIFICATIONS; ORIENTATION; POINT DEFECTS; RADIATIONS; RECOMBINATION; SHAPE; SHEAR; TWINNING; VACANCIES; twin bondaries; moving interfaces; radiation defects

Citation Formats

Serra, Anna, Bacon, David J, and Osetskiy, Yury N. Strengthening and microstructure modification associated with moving twin boundaries in hcp metals. United States: N. p., 2007. Web. doi:10.1080/09500830701244812.
Serra, Anna, Bacon, David J, & Osetskiy, Yury N. Strengthening and microstructure modification associated with moving twin boundaries in hcp metals. United States. doi:10.1080/09500830701244812.
Serra, Anna, Bacon, David J, and Osetskiy, Yury N. Mon . "Strengthening and microstructure modification associated with moving twin boundaries in hcp metals". United States. doi:10.1080/09500830701244812.
@article{osti_958785,
title = {Strengthening and microstructure modification associated with moving twin boundaries in hcp metals},
author = {Serra, Anna and Bacon, David J and Osetskiy, Yury N},
abstractNote = {The interaction of a moving {1012} twin boundary (TB) with clusters of self-interstitial atoms and vacancies, containing up to 35 point defects, has been studied by atomic computer simulation in a model crystal of hcp Zr. Conservative movement of the boundary has been achieved by glide of twinning dislocations under applied shear stress. Several reactions were observed, the result depending on cluster orientation and location relative to the glide plane of the twinning dislocation, i.e. tension or compression region. They included 1) restriction of TB mobility; 2) change of cluster orientation and shape; 3) glissile cluster drag by the TB without contact; and 4) total or partial absorption of a cluster by the TB and cluster drag, together with simultaneous glide along the TB. It is concluded that the applied shear stress for motion of TBs is raised by interaction with point defect clusters. Furthermore, moving TBs act as defect sinks or recombination centres and provide a means for removing defects from regions of radiation damage.},
doi = {10.1080/09500830701244812},
journal = {Philosophical Magazine Letters},
number = 7,
volume = 87,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}