The Effect of {10-12} Twin Boundary on the Evolution of Defect Substructure

Wang, F., Barrett, C. D., Molodov, K. D., Al-Samman, T., Oppedal, A. L., Molodov, D. A., Kontsos, A., Ramesh, K. T., El Kadiri, H., & Agnew, S. R. (2017). The Effect of {10-12} Twin Boundary on the Evolution of Defect Substructure. In K. N. Solanki, D. Orlov, A. Singh, N. R. Neelameggham (Eds.), Magnesium Technology 2017. San Diego, CA: Springer International Publishing. 175-180. DOI:10.1007/978-3-319-52392-7_27.

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 {10-12} 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 [c]-containing defects in the matrix were incorporated by a moving twin boundary, including ⟨c+a⟩, pure [c] dislocations and I1 stacking faults, the twin contains homogeneously distributed I1 stacking faults, which in some instances appear to be connected on twin boundary to the faults in the matrix.