Document Detail

Removal of stacking-fault tetrahedra by twin boundaries in nanotwinned metals.
MedLine Citation:
PMID:  23340417     Owner:  NLM     Status:  In-Data-Review    
Stacking-fault tetrahedra are detrimental defects in neutron- or proton-irradiated structural metals with face-centered cubic structures. Their removal is very challenging and typically requires annealing at very high temperatures, incorporation of interstitials or interaction with mobile dislocations. Here we present an alternative solution to remove stacking-fault tetrahedra discovered during room temperature, in situ Kr ion irradiation of epitaxial nanotwinned Ag with an average twin spacing of ~8 nm. A large number of stacking-fault tetrahedra were removed during their interactions with abundant coherent twin boundaries. Consequently the density of stacking-fault tetrahedra in irradiated nanotwinned Ag was much lower than that in its bulk counterpart. Two fundamental interaction mechanisms were identified, and compared with predictions by molecular dynamics simulations. In situ studies also revealed a new phenomenon: radiation-induced frequent migration of coherent and incoherent twin boundaries. Potential migration mechanisms are discussed.
K Y Yu; D Bufford; C Sun; Y Liu; H Wang; M A Kirk; M Li; X Zhang
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Nature communications     Volume:  4     ISSN:  2041-1723     ISO Abbreviation:  Nat Commun     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-01-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101528555     Medline TA:  Nat Commun     Country:  England    
Other Details:
Languages:  eng     Pagination:  1377     Citation Subset:  IM    
Department of Mechanical Engineering, Materials Science and Engineering Program, Texas A&M University, College Station, Texas 77843-3123, USA.
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