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: 2009
• 资助国家: 加拿大
• 起止时间: 2009-01-01 至 2010-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=419737
• 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.

动态位错缺陷分析（DDDA）是一种新发展的方法[1]，其基本概念是利用允许晶体物质塑性变形的移动位错来分类其在穿过晶体基质时遇到的障碍类型。 通过测试各种明确的微观结构，已经描绘出特定的热力学特征。为了将该方法转变为预测性研发技术，DDDA 必须与微观结构动力学相关联：(a) 通过定量建模作为合金热处理和/或金属加工过程中时间和温度的函数，以及 (b) 通过将演化颗粒的尺寸和分布与该冶金状态的强度和延展性相关联。这项工作主要需要使用简单的电子表格格式对 DDDA 签名的已知机制进行建模，以解释负责特定微观结构发展的原子机制。沉淀物生长和溶解模型的边界条件由本实验室之前和正在进行的工作以及文献的补充研究提供。 这个建模是由两名暑期本科生助理完成的，在与我在滑铁卢大学的可塑性理论同事的讨论中得出的结论是，这对于他们的合作实习生项目来说是一个很好的项目。 谈判正在进行中。该提案的长期目标是在足够多的工业利益案例中完成这份汇编，使这项新技术的应用能够扩展到全球每个研发中心。我们相信，随着我们当前更新的伺服液压系统和软件，可以评估任何金属板材产品的微观结构，以检查其材料加工历史是否可以优化，从而增强结构强度延展性。为了在全球范围内传播这些知识，我们将在成本回收的基础上举办研讨会和材料测试培训课程。