The effects of amorphous lamella on the crack propagation behavior in crystalline/amorphous（C/A） Mg/Mg–Al nanocomposites under tensile loading are investigated using the molecular dynamics simulation method. The sa...The effects of amorphous lamella on the crack propagation behavior in crystalline/amorphous（C/A） Mg/Mg–Al nanocomposites under tensile loading are investigated using the molecular dynamics simulation method. The sample with an initial crack of orientation（1210） [0001] is considered here. For the nano-monocrystal Mg, the crack growth exhibits brittle cleavage. However, for the C/A Mg/Mg–Al nanocomposites, the ‘double hump＇ behavior can be observed in all the stress–strain curves regardless of the amorphous lamella thickness. The results indicate that the amorphous lamella plays a critical role in the crack deformation, and it can effectively resist the crack propagation. The above mentioned crack deformation behaviors are also disclosed and analyzed in the present work. The results here provide a strategy for designing the high-performance hexagonal-close-packed metal and alloy materials.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11372256 and 11572259)the 111 Project(Grant No.B07050)+1 种基金the Program for New Century Excellent Talents in University of Ministry of Education of China(Grant No.NCET-12-1046)the Program for New Scientific and Technological Star of Shaanxi Province,China(Grant No.2012KJXX-39)
文摘The effects of amorphous lamella on the crack propagation behavior in crystalline/amorphous（C/A） Mg/Mg–Al nanocomposites under tensile loading are investigated using the molecular dynamics simulation method. The sample with an initial crack of orientation（1210） [0001] is considered here. For the nano-monocrystal Mg, the crack growth exhibits brittle cleavage. However, for the C/A Mg/Mg–Al nanocomposites, the ‘double hump＇ behavior can be observed in all the stress–strain curves regardless of the amorphous lamella thickness. The results indicate that the amorphous lamella plays a critical role in the crack deformation, and it can effectively resist the crack propagation. The above mentioned crack deformation behaviors are also disclosed and analyzed in the present work. The results here provide a strategy for designing the high-performance hexagonal-close-packed metal and alloy materials.
