Department of Mechanical Engineering, Technion-Israel Institute of Technology, 32000, Haifa, Israel.
Adv Mater. 2018 Oct;30(41):e1706710. doi: 10.1002/adma.201706710. Epub 2018 Jul 1.
Nanowires and nanoparticles are envisioned as important elements of future technology and devices, owing to their unique mechanical properties. Metallic nanowires and nanoparticles demonstrate outstanding size-dependent strength since their deformation is dislocation nucleation-controlled. In this context, the recent experimental and computational studies of nucleation-controlled plasticity are reviewed. The underlying microstructural mechanisms that govern the strength of nanowires and the origin of their stochastic nature are also discussed. Nanoparticles, in which the stress state under compression is nonuniform, exhibit a shape-dependent strength. Perspectives on improved methods to study nucleation-controlled plasticity are discussed, as well the insights gained for microstructural-based design of mechanical properties at the nanoscale.
纳米线和纳米粒子由于其独特的机械性能，被视为未来技术和设备的重要组成部分。金属纳米线和纳米粒子表现出出色的尺寸相关强度，因为它们的变形是位错形核控制的。在这方面，综述了最近关于形核控制塑性的实验和计算研究。还讨论了控制纳米线强度的微观结构机制以及它们随机性的起源。在压缩下，纳米粒子的应力状态不均匀，表现出与形状相关的强度。讨论了改进研究形核控制塑性的方法的观点，以及在纳米尺度上基于微观结构设计机械性能方面所获得的见解。
