INVESTIGATION OF ATOMISTIC DEFORMATION MECHANISM OF GRADIENT NANOTWINNED COPPER USING MOLECULAR DYNAMICS SIMULATION METHOD
Received date: 2013-09-09
Revised date: 2013-09-09
Online published: 2014-02-20
Supported by
Supported by National Natural Science Foundation of China (Nos.11172264 and 11222218) and Science and Technology Innovative Research Team of Zhejiang Province (No.2009R50010)
Strengthening by twin boundaries at nanoscale and gradient surface nanocrystallization are two important strengthening approaches recently drawing considerable attention in the field of metallic material research. In the present work, a novel nanostructure, i.e., gradient nanoscale twin boundaries, is proposed. To reveal their unique deformation mechanism, uniaxial tension simulations of gradient nanotwinned copper are investigated by molecular dynamics simulations. The results show that partial dislocations govern the deformation of relatively thicker twins while full dislocations control the deformation of relatively thinner twin layers. Nanoindentation processes of gradient nanotwinned copper are also performed, providing insights on the strengthening and hardening effects of nanoscale twin boundaries.
Key words： molecular dynamics; nanoscale twin boundary; dislocation; strength
Haofei ZHOU , Shaoxing QU . INVESTIGATION OF ATOMISTIC DEFORMATION MECHANISM OF GRADIENT NANOTWINNED COPPER USING MOLECULAR DYNAMICS SIMULATION METHOD[J]. Acta Metall Sin, 2014 , 50(2) : 226 -230 . DOI: 10.3724/SP.J.1037.2013.00570
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