The Effect of \( \{ 10\bar{1}2\} \) Twin Boundary on the Evolution of Defect Substructure

  • F. WangEmail author
  • C. D. Barrett
  • K. Hazeli
  • K. D. Molodov
  • T. Al-Samman
  • A. Oppedal
  • D. A. Molodov
  • A. Kontsos
  • K. T. Ramesh
  • H. El Kadiri
  • S. R. Agnew
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)


Pure Mg single crystals were deformed at room temperature along two orientations in sequence, in order to activate a specific dislocation slip mode followed by \( \left\{ {10\bar{1}2} \right\} \) twinning. The defects in both the matrix and twin crystals were analyzed with a transmission electron microscope (TEM). This study reveals the collective evolution of the defect substructure when a dislocated crystal is “invaded” by a moving twin boundary. When primarily \( \left[ c \right] \)-containing defects in the matrix were incorporated by a moving twin boundary, including \( \langle c + a\rangle \), pure \( \left[ c \right] \) dislocations and \( I_{1} \) stacking faults, the twin contains homogeneously distributed \( I_{1} \) stacking faults, which in some instances appear to be connected on twin boundary to the faults in the matrix.


Magnesium Hexagonal Single crystal Twin boundary TEM 



This work is supported by the National Science Foundation (NSF) grant number CMMI 1235259 (Mary Toney). A.K. acknowledges the NSF for the financial support provided through the CMMI 1434506 award to Drexel University. T.A.S., K.D.M. and D.A.M. express their gratitude to the Deutsche Forschungsgemeinschaft (DFG) for financial support (Grants AL 1343/5-1 and MO 848/18-1). The work was also supported in part by the Materials in Extreme Dynamic Environments program at the Johns Hopkins University.


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Copyright information

© The Minerals, Metals & Materials Society 2017

Authors and Affiliations

  • F. Wang
    • 1
    Email author
  • C. D. Barrett
    • 2
  • K. Hazeli
    • 3
  • K. D. Molodov
    • 4
  • T. Al-Samman
    • 4
  • A. Oppedal
    • 5
  • D. A. Molodov
    • 4
  • A. Kontsos
    • 6
  • K. T. Ramesh
    • 3
  • H. El Kadiri
    • 5
  • S. R. Agnew
    • 1
  1. 1.Department of Materials Science and EngineeringUniversity of VirginiaCharlottesvilleUSA
  2. 2.Center for Advanced Vehicular SystemsMississippi State UniversityStarkvilleUSA
  3. 3.Hopkins Extreme Materials InstituteThe Johns Hopkins UniversityBaltimoreUSA
  4. 4.Institute of Physical Metallurgy and Metal PhysicsRWTH Aachen UniversityAachenGermany
  5. 5.Department of Mechanical EngineeringMississippi State UniversityStarkvilleUSA
  6. 6.Department of Mechanical Engineering and MechanicsDrexel UniversityPhiladelphiaUSA

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