NIRT: Deformation Mechanisms and Manufacturing of Nanostructured Materials Processed by Severe Plastic Deformation (SPD)

NIRT：严重塑性变形（SPD）加工的纳米结构材料的变形机制和制造

• 批准号: 0210173
• 负责人: Robert Asaro
• 金额: --
• 依托单位: University of California-San Diego
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-07-01 至 2008-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0210173&HistoricalAwards=false
• 关键词: NIRT; Deformation; Mechanisms; Manufacturing; Nanostructured

This proposal aims to gain fundamental understanding of thedeformation mechanisms that operate in nanostructured metals andalloys, in particular in those produced by severe plastic deformation(SPD) methods. Based on this knowledge it further aims to develop fullcapability to manufacture these materials in high quality bulk forms.The extremely attractive (and rare) combination of mechanicalproperties (high strength, ductility, fatigue resistance) andmanufacturability of these materials leads to a new class of highperformance alloys for structural uses. It is understood that thiscombination of properties is due to the formation of nano-scale grainsizes in these materials, but the mechanisms responsible for the highstrength combined with high ductility are not well understood. Thispresents a fundamental obstacle to the optimization of thesematerials, or to predictions of the performance of these materials inapplications.An integrated approach with strong emphasis on manufacturing isproposed. On the theoretical side, deformation mechanisms will besimulated with crystal-plasticity aggregate models and with detailedmodels of the grains and grain boundaries. The experimental programcovers a wide a range of strain rates and temperatures, texturedevelopment, and in situ transmission electron microscopy and atomicforce microscopy to directly verify deformation mechanisms. Theexperimental results will provide validation to the theoreticalmodeling and manufacturing process simulations.Finally, simulations of the manufacturing processes will enableprocess parameter optimization. A complete, miniature, yet fullyscalable, manufacturing facility will be designed and implemented.The significant impacts of the proposed research are made possible bythe acquired fundamental understanding of the deformation mechanisms,and include advances in manufacturing techniques to produce thesehighly desirable materials in bulk. The miniature manufacturingfacility will become a source of significant quantities ofnano-structured alloys. Finally, the proposal will provide students atthe UCSD and at local K-12 schools with interdisciplinary education ina cutting-edge area of research.

该提案旨在从根本上了解纳米结构金属和合金的变形机制，特别是通过严重塑性变形（SPD）方法产生的变形机制。基于这些知识，它进一步致力于开发以高质量散装形式制造这些材料的全部能力。这些材料的机械性能（高强度、延展性、抗疲劳性）和可制造性的极其有吸引力（且罕见）的组合导致了用于结构用途的新型高性能合金。 据了解，这种特性的组合是由于这些材料中纳米级晶粒的形成，但导致高强度与高延展性相结合的机制尚不清楚。这对这些材料的优化或这些材料在应用中的性能预测构成了根本障碍。提出了一种重点关注制造的综合方法。在理论方面，将使用晶体塑性聚集体模型以及晶粒和晶界的详细模型来模拟变形机制。 该实验程序涵盖了广泛的应变率和温度、织构开发以及原位透射电子显微镜和原子力显微镜，以直接验证变形机制。实验结果将为理论建模和制造过程模拟提供验证。最后，制造过程的模拟将实现过程参数优化。 将设计和实施一个完整的、微型的、但完全可扩展的制造设施。所提出的研究的重大影响是通过对变形机制的基本了解而实现的，并且包括批量生产这些非常理想的材料的制造技术的进步。微型制造设施将成为大量纳米结构合金的来源。 最后，该提案将为加州大学圣地亚哥分校和当地 K-12 学校的学生提供前沿研究领域的跨学科教育。