Testing Mechanical Behavior At The Nanoscale Using Isolated Nanostructures

用隔离纳米结构测试纳米尺度下的力学行为[j]。中国理工大学机械、航天与核工程学系王和t.m.。物理系，应用物理与天文。我们提出了一种纳米尺度的元素（Cu和W）试样力学性能的实验研究。我们将使用斜角度沉积技术生长的新纳米结构家族，这些纳米结构已被专门设计为测试样本。纳米结构以隔离的纳米棒、纳米梁和纳米弹簧的形式存在，它们的一端固定在刚性衬底上。他们将用原子力显微镜（AFM）的尖端或纳米压头进行测试。这些样品的设计是为了重现标准的宏观测试，在这种测试中，一个定义良好的材料体积被加载在已知的应力状态下。我们将研究：材料性能（模量，屈服应力）和行为（例如硬化）随试样尺寸的缩放，是否可以使用固溶硬化来定制纳米结构的机械性能，以及疲劳行为。该提案具有结构良好的教育成分，将在MEMS和NEMS领域产生更广泛的影响。

Testing Mechanical Behavior at the Nanoscale Using Isolated NanostructuresR.C. Picu, Department of Mechanical, Aerospace and Nuclear Engineering,G.-C. Wang and T.-M. Lu, Department of Physics, Applied Physics and Astronomy.We propose an experimental study of the mechanical properties of elemental (Cu and W) specimens with nanoscale dimensions. We will use a new family of nanostructures grown by the oblique angle deposition technique that have been specially designed as test specimens. The nanostructures are in the form of isolated nanorods, nanobeams and nanosprings that are fixed at one end to a rigid substrate. They will be tested with the tip of an atomic force microscope (AFM) or a nanoindenter. The samples are designed to reproduce standard macroscopic tests in which a well-defined volume of material is loaded with a known stress state. We will investigate: the scaling of material properties (moduli, yield stress) and behavior (e.g. hardening) with the specimen size, whether solid solution hardening may be used to tailor mechanical properties in nanostructures, and the fatigue behavior. The proposal has a well-structured educational component and will have a broader impact in the field of MEMS and NEMS.