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.

动态位错缺陷分析（DDDA）是一种新发展起来的方法[1]，其基本思想是利用允许晶体物质塑性变形的移动的位错来区分它在通过晶体基质时遇到的障碍物类型。 通过测试各种定义明确的微观结构，特定的热力学特征已经被描绘出来。为了将这种方法转化为预测性研发技术，DDDA必须与微观结构动力学相关：（a）通过定量建模作为合金热处理和/或金属加工期间的时间和温度的函数，以及（B）通过与演变颗粒的尺寸和分布以及冶金状态的强度和延展性的相关性。这项工作主要需要建模的已知机制方面的DDDA签名使用一个简单的电子表格格式来解释原子机制负责特定的微观结构的发展。沉淀物的生长和溶解的这种建模的边界条件提供了以前和正在进行的工作，在这个实验室和补充研究文献。 这个模型是由两个暑期本科生助理完成的，在与我在滑铁卢大学的塑性理论同事讨论后，他们得出结论，这将是一个很好的合作实习项目。 这项建议的长远目标，是在足够的工业界关注个案中，完成这方面的汇编工作，使这项新技术的应用能推广至世界上每一个研究及发展中心。我们相信，随着我们目前对伺服液压系统和软件的更新，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，从而提高结构强度和延展性。为了在全球传播这方面的知识，将在成本回收的基础上举办讲习班和材料测试培训班。