Mechanical behavior of Cu-W interface systems upon tensile loading from molecular dynamics simulations
GC Ma and JL Fan and HR Gong, COMPUTATIONAL MATERIALS SCIENCE, 152, 165-168 (2018).
Molecular dynamics simulations reveal that compared with Cu, the Cu/W interface with the Kurdjumov-Sachs relationship possesses higher critical strength in the 1 1 (2) over bar(Cu) or (1) over bar 1 0(Cu) direction and much lower strength in the 1 1 1(Cu) direction, while its ductility is smaller, mainly due to constraints of the interface and W lattice. The evolution of Shockley partial dislocations of Cu/W interface has a strong correlation with the direction of tensile loading, and three edge dislocations appear in the 1 1 1(Cu) direction, while two and one mixed dislocations in the 1 1 (2) over bar(Cu) and (1) over bar 1 0(Cu) directions, respectively. The obtained results are discussed and compared to provide a deep understanding of the stress-strain behavior and dislocation evolution of the Cu/W interface.
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