FABRICATIONS AND MECHANICAL PROPERTIES OF SUPER STRONG FUNCTIONAL NANOSTRUCTURES

超强功能纳米结构的制备和力学性能

• 批准号: 355552-2012
• 负责人: Tsui, Ting
• 金额: $ 2.11万
• 依托单位: University of Waterloo
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2012
• 资助国家: 加拿大
• 起止时间: 2012-01-01 至 2013-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=509937
• 关键词: FABRICATIONS; MECHANICAL; PROPERTIES; SUPER; STRONG

The functionality, lifetime, and commercial success of nanoelectronics ultimately depend on our ability to successfully design and engineer the mechanical properties of the small scale structures that comprise them. To that end, it is imperative to gain a fundamental understanding of the physical properties and reliability of nanoelectronics as a function of size in the sub-micron to nanometer scales. However, strengthening techniques that work well in bulk are often difficult to implement at the nanoscale level. For example, bulk nanocrystalline Ni specimens exhibit superior mechanical strength, but because of the grain boundary sliding, they soften when the sample is reduced to smaller than 100 nm. Conversely, well annealed single crystalline structures, which are soft in bulk, exhibit superior mechanical strength as the sample dimension decreases. Some proposed mechanisms recently suggested to explain this strength size effect include the dislocation starvation effect, stochastic behaviors, and nano-twin formations. These mechanism theories are unique to nanostructures; however, they are still in their infancy and need further development. This study has three objectives: 1) explore the alloying and precipitation effects on the mechanical properties of metallic nanostructures; 2) investigate the carbon nanotube-metal matrix nanocomposite mechanical deformation behaviors; and 3) develop guidelines to fabricate super-strong nanostructures. The proposed project will be conducted in our research facility using a state-of-the-art in-situ nanoindenter installed within a field-emission scanning electron microscope. This is believed to be the first and only in-situ nanoscale mechanical testing instrument in Canada, and one of only a few in the world. We anticipate that the proposal project will lead to an in-depth understanding of the solute/precipitation effect and the CNT influences on the strength of nanostructures, making it possible to develop structures that are strong and able to fulfill the functional behaviors.

纳米电子的功能、寿命和商业成功最终取决于我们成功地设计和设计构成它们的小规模结构的机械性能的能力。为此，必须从根本上了解在亚微米到纳米范围内纳米电子器件的物理特性和可靠性随尺寸的变化情况。然而，大量有效的强化技术往往很难在纳米级实施。例如，块体纳米晶镍样品表现出良好的机械强度，但由于晶界滑动，当样品还原到小于100 nm时，它们会变软。相反，随着样品尺寸的减小，经过良好退火的单晶结构，其体积较软，表现出更高的机械强度。最近提出的解释这种强度尺寸效应的一些机制包括位错饥饿效应、随机行为和纳米孪晶的形成。这些机制理论是纳米结构所独有的，但它们仍处于起步阶段，需要进一步发展。本研究有三个目的：1)探索合金化和沉淀对金属纳米结构力学性能的影响；2)研究碳纳米管-金属基纳米复合材料的力学变形行为；3)开发制备超强纳米结构的指南。拟议的项目将在我们的研究设施中进行，使用安装在场发射扫描电子显微镜内的最先进的原位纳米压痕。这被认为是加拿大第一台也是唯一一台原位纳米级机械测试仪器，也是世界上为数不多的几台之一。我们预计，该项目将导致对溶质/沉淀效应和碳纳米管对纳米结构强度的影响的深入了解，从而有可能开发出坚固且能够实现功能行为的结构。