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  • http://hdl.handle.net/10402/era.27593
  • A molecular dynamics modeling study on the mechanical behavior of nano-twinned Cu and relevant issues
  • Yue, Lei
  • English
  • Nano-twinned copper
    Hall-Petch
    Tensile test
    MD
    Bauschinger effect
  • Jun 8, 2010 5:32 PM
  • Thesis
  • English
  • Adobe PDF
  • 5195654 bytes
  • 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.
  • Master's
  • Master of Science
  • Department of Chemical and Materials Engineering
  • Fall 2010
  • Li, Dongyang (Chemical and Materials Engineering)
    Zhang, Hao (Chemical and Materials Engineering)
  • Raboud, Donald (Mechanical Engineering)