Collaborative Proposal: Manufacturing of Nanocrystalline Bulk Materials by Field Activated Sintering

将为纳米颗粒材料的现场加工建立一个科学框架。 特别是，将追求一个详细的理论-实验方案，其具体目标是：（a）评估和阐明纳米尺寸粉末的材料性质、微结构的几何形状和加工参数的相互依赖性，（B）量化通过烧结纳米粉末压块的电流传导并将它们与制造和性质相关联，及（c）为这项技术发展一套适用于制造大型及净形零件的纳米晶材料的工艺设计/表征方法。（a）产生现场处理中尺寸比例的作用的基本知识，（B）阐明负责现场烧结的增强性能的特定机制，（c）为工艺设计和该工艺的优化提供合理的基础，（d）为复杂形状加工设计的新模型的开发提供指导，以优化当前的应用以及模具设计。 此外，我们还将制作大量纳米晶材料样品，对样品的结构、缺陷和机械性能进行广泛表征。晶粒尺寸小于100 nm的结构材料具有非常高的强度、硬度和耐磨性，以及良好的抗疲劳性。 该项目的重点是通过场辅助烧结生产的块状纳米晶材料的制造和表征，该材料可以从纳米尺寸粉末开始生产近净形块状部件，并在加工过程中保持微观结构的尺度。开发用于制造散装纳米级材料的科学加工基础将是朝着这种令人兴奋的新材料的商业化迈出的重要一步，这种材料保持纳米晶粒尺寸并结合联合收割机不寻常的性能。这两所大学之间的合作建议将提供一个协同效应，以提高在德雷克塞尔大学进行的建模和纳米过程的理解，通过实验在加州戴维斯大学。教育和培训的整合在研究计划内将通过开发研讨会课程德雷克塞尔和UCD学生“散装纳米材料的制造”实现。我们将继续通过REU补充研究本科生参与。

A scientific framework will be established for field processing of nanosize particulate materials. In particular, a detailed theoretical-experimental program will be pursued with specific goals to: (a) evaluate and clarify the interdependence of material properties, geometry of microstructure and processing parameters of nanosize powders, (b) quantify the conduction of electric current through sintering nanopowder compacts and relate them to manufacturing and properties, and (c) develop a process design/characterization methodology for this technology that is applicable to nanocrystalline materials for large and net shape parts.This project will: (a) generate fundamental knowledge of the role of size scale in field processing, (b) elucidate specific mechanisms responsible for the enhanced performance of field sintering, (c) provide a rational basis for process design and optimization of this process, (d) provide guidance for the development of new models for design of complex shape processing in terms of optimization of current application, as well as die design. In addition, we will generate sizable specimens of nanocrystalline materials that will be extensively characterized for structure, defects and mechanical properties.Structural materials with grain size less than 100 nm are characterized by unusually high strength, hardness and wear resistance, as well as good fatigue resistance. This project focuses on the manufacturing and characterization of bulk nanocrystalline materials produced by field assisted sintering that can produce near net-shape bulk components starting from nanosize powders, and retains the scale of the microstructure during processing. The development of a scientific processing base for manufacturing of bulk nanoscale materials will be a major step towards commercialization of this exciting new class of materials which preserve nanometric grain size and combine unusual properties. This collaborative proposal between two Universities will provide a synergistic effect to enhance both modeling performed at Drexel University and nano-process understanding by experiments at University of California Davis.The integration of education and training within the research program will be achieved by developing a seminar course for Drexel and UCD students on "Manufacturing of bulk nanomaterials". We will continue involving undergraduate students in research by REU supplements.