Size dependence and associated formation mechanism of multiple-fold annealing twins in nanocrystalline Cu

The formation mechanisms and grain size dependence of annealing coherent multiple-fold twins, such as twofold and fivefold twins, were investigated in nanocrystalline Cu with zero applied stress by a combination of transmission electron microscopy and molecular dynamics (MD) simulation. It was found...

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Bibliographic Details
Published in:Acta materialia 2015-08, Vol.95, p.312-323
Main Authors: Cao, Z.H., Xu, L.J., Sun, W., Shi, J., Wei, M.Z., Pan, G.J., Yang, X.B., Zhao, J.W., Meng, X.K.
Format: Article
Language:English
Subjects:
Annealing
ANNEALING PROCESSES
Coherence
COMPUTER SIMULATION
Copper
CRYSTAL STRUCTURE
DISLOCATIONS
Formation mechanism
Formations
Grain size
GRAIN SIZE AND SHAPE
Grains
Multiple-fold twins
Nanocrystalline
Nanocrystals
Simulation
Size effect
TWINNING MECHANISMS
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Summary:The formation mechanisms and grain size dependence of annealing coherent multiple-fold twins, such as twofold and fivefold twins, were investigated in nanocrystalline Cu with zero applied stress by a combination of transmission electron microscopy and molecular dynamics (MD) simulation. It was found that the formation frequency of twofold and fivefold twins with coherent twin boundaries (CTB) increases with decreasing grain size (d), reaching a maximum frequency at the critical size of 35nm, followed by a reduction at d
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2015.05.036