التفاصيل البيبلوغرافية
| العنوان: |
On the role of weak interface in crack blunting process in nanoscale layered composites. |
| المؤلفون: |
Li, Yi1,2, Zhou, Qing3, Zhang, Shuang3, Huang, Ping3 huangping@mail.xjtu.edu.cn, Xu, Kewei3, Wang, Fei1,2 wangfei@mail.xjtu.edu.cn, Lu, Tianjian1,2 |
| المصدر: |
Applied Surface Science. Mar2018, Vol. 433, p957-962. 6p. |
| مصطلحات موضوعية: |
*CRACK propagation (Fracture mechanics), *COMPOSITE materials, *METALLIC surfaces, *DISLOCATION nucleation, *MOLECULAR dynamics |
| مستخلص: |
Heterointerface in a nanoscale metallic layered composite could improve its crack resistance. However, the influence of metallic interface structures on crack propagation has not been well understood at atomic scale. By using the method of molecular dynamics (MD) simulation, the crack propagation behavior in Cu-Nb bilayer is compared with that in Cu-Ni bilayer. We find that the weak Cu-Nb interface plays an important role in hindering crack propagation in two ways: (i) dislocation nucleation at the interface releases stress concentration for the crack to propagate; (ii) the easily sheared weak incoherent interface blunts the crack tip. The results are helpful for understanding the interface structure dependent crack resistance of nanoscale bicrystal interfaces. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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