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A molecular dynamics modeling study on the mechanical behavior of nano-twinned Cu and relevant issues Open Access


Other title
Tensile test
Nano-twinned copper
Bauschinger effect
Type of item
Degree grantor
University of Alberta
Author or creator
Yue, Lei
Supervisor and department
Li, Dongyang (Chemical and Materials Engineering)
Zhang, Hao (Chemical and Materials Engineering)
Examining committee member and department
Raboud, Donald (Mechanical Engineering)
Department of Chemical and Materials Engineering

Date accepted
Graduation date
Master of Science
Degree level
As a candidate for dynamic electric contacts, Nano-twinned copper has intrinsic conductivity and enhanced fretting resistance. To better understand its general mechanical behavior, we conduct molecular dynamics simulation studies to investigate responses of nano-twinned copper to stress and to one-directional and two-directional sliding processes, in comparison with single crystal and nano-grained model systems. Obtained results suggest that the twin boundary blocks dislocation movement more effectively and the degree of emitting dislocations under stress is considerably lower than that of grain boundary. The inverse H-P relation only occurring in nano-grained materials does not necessarily result from grain boundary sliding. Under sliding conditions, dislocations are easier to be generated in the single crystal system. During the two-directional sliding process, Bauschinger effect is observed in the single crystal and nano-twinned systems, while the situation is opposite for the nano-grained system. The nano-twinned Cu shows the least dislocation accumulation during two-directional sliding.
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