Application of dynamic dislocation-defect analysis to materials engineering practice

动态位错缺陷分析(DDDA)是一种新发展起来的方法[1]，它的基本思想是利用晶体中允许塑性变形的移动位错来分类它在穿过晶体基质时遇到的障碍类型。通过测试各种定义良好的微结构，已经描绘出特定的热力学特征。为了将这一方法转变为预测性研发技术，DDDA必须与微观组织动力学相关联：(A)通过在合金热处理和/或金属加工过程中作为时间和温度函数的定量建模，以及(B)通过将演变颗粒的大小和分布与该冶金状态的强度和延展性相关联。这项工作主要是利用一种简单的电子表格格式对与DDDA签名有关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。本实验室以前的工作和正在进行的工作以及文献中的补充研究提供了这种沉淀物生长和溶解模型的边界条件。这个模型是由两名暑期本科生助理完成的，在与滑铁卢大学的塑性理论同事讨论后得出结论，这将是他们合作实习生计划的一个很好的项目。谈判仍在进行中，这项建议的长远目标是在足够有工业价值的情况下完成这项汇编，使这项新技术的应用可推广至世界各地的研发中心。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，以检查是否可以优化其材料加工历史，以提高结构-强度-塑性的性能。为了在全球传播这一知识，将在成本回收的基础上提供讲习班和材料测试培训课程。

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.