Effect of microstructure and temperature on the intrinsic and extrinsic length scale dependence of plastic deformation in metals

微观结构和温度对金属塑性变形的内在和外在长度尺度依赖性的影响

• 批准号: 227350-2010
• 负责人: Klassen, Robert
• 金额: $ 1.46万
• 依托单位: University of Western Ontario
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=594058
• 关键词: Effect; microstructure; temperature; intrinsic; extrinsic

Metal components of increasingly smaller size are now being used in MEMS devices and microelectronic circuitry. These components are often subjected to high stress or local heating during service. The stress necessary to cause these components to plastically deform depends upon both intrinsic factors, inherent to the specific metal, and extrinsic effects imposed by geometrical constraint. The effect of microstructural features and temperature on the intrinsic and extrinsic length scale dependence of the plastic deformation is not well understood. The proposed research will perform a variety of nano-mechanical tests and electron microscopy investigations on sub-micrometer size specimens of pure gold, aluminum, and copper at temperatures up to 300 C to measure the effect of specific microstructural features, such as crystallographic orientation, impurity content, grain size and angular grain boundary misorientation, on the activation energies of the dislocation nucleation and glide processes that govern the plasticity of sub-micrometer size metal components.

尺寸越来越小的金属元件现在被用于 MEMS 器件和微电子电路。这些部件在使用过程中经常承受高应力或局部加热。导致这些部件塑性变形所需的应力取决于特定金属固有的内在因素和几何约束施加的外在效应。微观结构特征和温度对塑性变形的内在和外在长度尺度依赖性的影响尚不清楚。拟议的研究将在高达 300°C 的温度下对亚微米尺寸的纯金、铝和铜样品进行各种纳米机械测试和电子显微镜研究，以测量特定微观结构特征的影响，例如晶体取向、杂质含量、晶粒尺寸和角晶界取向差，以及控制亚微米尺寸金属部件塑性的位错成核和滑移过程的活化能。