Time-dependent deformation and fracture at interfaces of nanostructures

蠕变断裂在纳米级上的界面处的主导力学进行评估的基础上，在室温下进行的蠕变实验上的Ti斜纳米柱生长在Si衬底上，使用掠射角沉积。在恒定的外力作用下，试样发生了随时间变化的变形，然后钛纳米柱在界面处断裂。在考虑Ti纳米柱蠕变的同时，分析了蠕变实验中Ti/Si界面沿着的局部应力分布。两种断裂寿命相近的试样在界面边缘附近的应力在约5 nm的区域非常接近，尽管它们在边缘处具有不同的奇异性。这表明，蠕变界面断裂是由局部应力场在纳米级区域。

The dominant mechanics of creep fracture at interfaces on the nanoscale was evaluated on the basis of creep experiments conducted at room temperature on Ti oblique nanocolumns grown on a Si substrate using glancing angle deposition. The specimens deformed in a time-dependent manner under a constant applied force, and then the Ti nanocolumns fractured at the interface. The local stress distribution along the Ti/Si interface during the creep experiments was analyzed while giving due consideration to the creep of the Ti nanocolumn. The stresses near the interface edge in the region of about 5 nm were very close in the two types of specimens with similar fracture lives although they had different singularities at the edge. This suggested that the creep interfacial fracture was dominated by the local stress field in the nanoscale region.