Application of dynamic dislocation-defect analysis to materials engineering practice

动态位错缺陷分析在材料工程实践中的应用

• 批准号: 3523-2008
• 负责人: Saimoto, Shigeo
• 金额: $ 1.75万
• 依托单位: Queen's University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2008
• 资助国家: 加拿大
• 起止时间: 2008-01-01 至 2009-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=388783
• 关键词: Application; dynamic; dislocation; defect; analysis

Dynamic dislocation-defect analysis (DDDA) is a newly developed method [1], the basic notion of which is to use the mobile dislocations, which permits plastic deformation in crystalline matter, to sort out the types of obstacles it encounters in its passage through the crystalline matrix. By testing various well- defined microstructures, the specific thermodynamic signatures have been delineated. To transform this methodology into a predictive R&D technology, the DDDA must be correlated to microstructural kinetics: (a) by quantitative modelling as a function of time and temperature during alloy heat treatment and/or metal processing and (b) by correlation to the size and distribution of the evolving particles to the strength and ductility of that metallurgical state. This work primarily entails modelling of known mechanisms with respect to the DDDA signatures using a simple spreadsheet format to interpret the atomic mechanisms responsible for the development of specific microstructures. The boundary conditions for this modelling of the growth and dissolution of precipitates are provided by previous and on-going work in this laboratory and supplementary studies from the literature. This modelling was performed by two summer undergraduate assistants and in discussion with my plasticity theory colleagues at Waterloo University concluded it would be a good project for their coop-intern program. Negotiations are in progress.The long-term objective of this proposal is to complete this compilation in sufficient cases of industrial interest such that the application of this new technology will spread to every R&D centre in the world. We believe that, with the our current up-dating of the servo-hydraulic system and software, the microstructure of any metal sheet product can be assessed to examine if its material processing history can be optimized to result in enhanced properties of structure-strength-ductility. To globally communicate this knowledge, workshops and materials-testing training courses will be offered on a cost recovery basis.

动态错位缺陷分析（DDDA）是一种新开发的方法[1]，其基本概念是使用移动位错（允许结晶物质中的塑性变形）来整理其通过其通过其通过的障碍的类型结晶矩阵。 通过测试各种定义的微观结构，已经描绘了特定的热力学特征。要将这种方法转化为预测性研发技术，必须将DDDA与微结构动力学相关：（a）通过定量建模作为合金热处理和/或金属加工过程中的时间和温度的函数，以及（b）与大小相关和不断发展的颗粒分布到冶金状态的强度和延展性。这项工作主要需要使用简单的电子表格格式来对DDDA特征进行建模，以解释负责特定微观结构发展的原子机制。该实验室和文献补充研究中的持续工作提供了这种沉淀生长和溶解的边界条件。 这种建模是由两个夏季的本科助理进行的，并在与我在滑铁卢大学的可塑性理论同事讨论时得出结论，这将是他们的Coop-Intern计划的好项目。 谈判正在进行中。该提案的长期目标是在足够的工业利益案例中完成此汇编，以便将这项新技术的应用传播到世界上每个研发中心。我们认为，借助我们当前的伺服液压系统和软件的更新，可以评估任何金属板产品的微观结构，以检查是否可以优化其材料处理历史记录，从而提高结构 - 强度的性能延性。为了在全球范围内传达这些知识，将以成本恢复的基础提供研讨会和材料测试培训课程。