Epitaxy, Structure, Stress and Plastic Behavior in High Strength Metal Multilayers

高强度金属多层膜中的外延、结构、应力和塑性行为

• 批准号: 9408552
• 负责人: Bruce Clemens
• 金额: $ 61.44万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-09-01 至 2001-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9408552&HistoricalAwards=false
• 关键词: Epitaxy; Structure; Stress; Plastic; Behavior

9408552 Clemens The purpose of this research is to investigate and optimize the strengthening mechanisms in epitaxial metal multilayers. A previous grant developed the capability for growing and structurally characterizing epitaxial (001) oriented FCC/BCC superlattices by sputter deposition. Hardnesses of these materials were investigated and enhancements nearly 300% found over the rule of mixtures. This remarkable phenomenon is the subject of this continued program. Using singly-oriented, epitaxial films, both the mismatch and relative thickness of layers are varied to deduce plastic flow mechanisms. Structural characterization involves high resolution cross-section transmission electron microscopy of as-deposited and deformed materials so that the atomic scale defects responsible for deformation can be identified. This information is incorporated into the modeling component of the program, which utilizes both continuum and atomistic approaches. %%% One result of this program will be metal films of unusually high hardness. These films could find applications in semiconductor, information storage, and coatings technologies. In addition, this program should develop fundamental understanding about plastic deformation in layered materials and ultra-thin films. ***

小行星9408552 本研究的目的是探讨和优化外延金属多层膜的强化机制。 先前 格兰特开发了 增长 以及通过溅射沉积对外延（001）取向的FCC/BCC超晶格进行结构表征。 硬度 的 对这些材料进行了研究，发现其比混合物规则提高了近300%。 这个引人注目的现象是 这个持续的计划。 使用单一取向的外延膜，层的失配和相对厚度都是变化的，以推断塑性流动机制。 结构表征 涉及 高 决议 横截面透射电子显微镜的沉积和变形的材料，使原子尺度的缺陷，负责变形可以识别。 这些信息被纳入到程序的建模组件中，该组件利用连续统和原子方法。 该程序的一个结果是金属薄膜具有异常高的硬度。 这些薄膜可以在半导体、信息存储和涂层技术中找到应用。 此外，该计划应发展有关层状材料和超薄薄膜的塑性变形的基本理解。 ***