Mechanics of Nanoscale Heterointerfaces

纳米级异质界面的力学

• 批准号: 0553300
• 负责人: Satya Atluri
• 金额: $ 22.5万
• 依托单位: University of California-Irvine
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-01 至 2010-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0553300&HistoricalAwards=false
• 关键词: Mechanics; Nanoscale; Heterointerfaces

Mechanics of Nanoscale HeterointerfacesSatya Atluri, University of California at IrvineHanchen Huang, Rensselaer Polytechnic InstituteThis project aims to reveal atomistic mechanisms of dislocation nucleation and agglomeration that triggers delamination of thin films. In almost all thin films, there is strain. The origins of strain may be film-substrate mismatch, defect in the film, and thermal expansion, among others. As a result of the strain, dislocations form, and film substrate delamination occurs when dislocations agglomerate at the film-substrate interface. Mechanisms of the dislocation nucleation and the delamination remain unclear, despite numerous studies at the continuum level. Using a combination of atomistic simulations and meshless Local Petrov-Galerkin (MLPG) equivalent-continuum calculations, the investigators will examine the mechanisms of dislocation nucleation and agglomeration and corresponding delamination processes in strained thin films. The scientific contribution of this project is in the discovery of atomic mechanisms of dislocation nucleation and agglomeration that triggers delamination. The results may shed lights on feasible means of minimizing or preventing the delamination for technological benefits. A broader impact of this project is the education of graduate students, including students of Hispanic origin in Southern California.

纳米尺度异质界面的力学SatyaKomuri，Irvine的加州大学黄汉臣，伦斯勒理工学院该项目旨在揭示引发薄膜分层的位错成核和聚集的原子机制。 在几乎所有的薄膜中，都存在应变。应变的来源可以是膜-衬底失配、膜中的缺陷和热膨胀等。作为应变的结果，位错形成，并且当位错在膜-基底界面处聚集时发生膜-基底分层。位错成核和分层的机制仍然不清楚，尽管在连续水平上的许多研究。使用原子模拟和无网格局部Petrov-Galerkin（MLPG）等效连续计算的组合，研究人员将研究应变薄膜中位错成核和团聚以及相应分层过程的机制。该项目的科学贡献在于发现了引发分层的位错成核和聚集的原子机制。结果可能会揭示最大限度地减少或防止分层以获得技术利益的可行方法。该项目的一个更广泛的影响是研究生的教育，包括南加州的西班牙裔学生。