Strength at the nanoscale: fundamental mechanisms of plasticity in nano-structured materials

纳米尺度的强度：纳米结构材料可塑性的基本机制

• 批准号: 203024-2007
• 负责人: Miller, RonaldEarle
• 金额: $ 2.14万
• 依托单位: Carleton University
• 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=496803
• 关键词: Strength; nanoscale; fundamental; mechanisms; plasticity

Metallic alloys are useful for engineering applications largely due to their high strength. Recently, materials scientists have discovered that this strength is further enhanced by so-called "nano-structured materials". These are often the same alloys as conventional metals, but with special microstructural features refined to the nanometer-scale. One finds, however, that the primary mechanisms governing strength and ductility are different in nano-structured materials than in conventional ones. This new physics is not well understood, but occurs on length scales accessible to both modern atomistic simulation and nano-experiments. It is a unique regime where a direct link between simulation and experimentation is possible.

金属合金在工程上的应用很大程度上是由于它们的高强度。最近，材料科学家发现，所谓的“纳米结构材料”进一步增强了这种强度。这些合金通常与传统金属相同，但具有细化到纳米级的特殊微观结构特征。然而，人们发现纳米结构材料控制强度和延展性的主要机制与传统结构材料不同。这种新的物理学还没有被很好地理解，但它发生在现代原子模拟和纳米实验都能达到的长度尺度上。这是一种独特的机制，使模拟和实验之间的直接联系成为可能。