Materials World Network: Processing-Structure-Property Relationships in Ultra-Fine Grained and Nanostructured Bulk Cu and Cu-Zn Alloys

材料世界网络：超细晶粒和纳米结构块状铜和铜锌合金的加工-结构-性能关系

• 批准号: 0806323
• 负责人: Carl Koch
• 金额: $ 48.2万
• 依托单位: North Carolina State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-08-15 至 2012-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0806323&HistoricalAwards=false
• 关键词: Materials; World; Network; Processing; Structure

This research is based on collaboration among North Carolina State University (NCSU), the University of Vienna, Austria (UV), and IFW-Dresden, Germany (IFW-D). The scientific objectives of the research are to exploit a range of processing and characterization techniques and expertise to investigate the mechanical behavior of metals and alloys as a function of their grain size and stacking fault energy. In particular, Cu and Cu-Zn alloys are prepared by processing techniques at the various institutions that, when combined, produce artifact-free bulk samples with a grain size range from ultra-fine ( 1000 nm) down to the finest achievable at the nanoscale (~ 10 nm). The combined effort and facilities at NCSU, UV, and IFW-D are needed to achieve the processing objectives. The critical mechanical properties are determined by tensile, shear and nanoindentation tests at NCSU, compression, tensile and torsion tests at IFW-D, and fatigue and fracture toughness at UV. The deformation mechanisms that are operative at the various grain sizes and stacking fault energies are probed by in situ x-ray diffraction line broadening studies under stress at UV and NCSU with collaborators. In situ transmission electron microscopy (TEM) straining studies are done by IFW-D and NCSU, and in situ scanning electron microscopy (SEM) is done at IFW-D. An extensive set of density functional theory (DFT) calculations and large-scale molecular dynamics (MD) simulations are also done at NCSU, while mechanism-based and related modeling is done at NCSU, UV, and IFW-D. The exchange of graduate students and the faculty interactions among NCSU, UV and IFW-D constitute a major part of the project.

这项研究基于北卡罗来纳州立大学（NCSU），维也纳大学（UV）和德国IFW-DRESDEN（IFW-D）的合作。 该研究的科学目标是利用一系列的处理和表征技术和专业知识，以研究金属和合金的机械行为，其晶粒尺寸和堆叠断层能量的函数。 特别是，通过在各个机构中处理技术来制备Cu和Cu-Zn合金，这些技术在合并后生产无粮食的散装样品，其晶粒尺寸范围从超细（1000 nm）范围从纳米级（〜10 nm）中达到的最佳范围。需要在NCSU，UV和IFW-D上进行的合并工作和设施来实现处理目标。临界机械性能通过在IFW-D处的NCSU，压缩，拉伸和扭转测试以及UV处的疲劳和断裂韧性在NCSU，压缩，拉伸和扭转测试中确定。 在各种晶粒尺寸和堆叠故障能量下可操作的变形机制是通过与合作者在UV和NCSU的压力下进行的原位X射线衍射线扩展研究的。 原位透射电子显微镜（TEM）的拉力研究是通过IFW-D和NCSU进行的，原位扫描电子显微镜（SEM）是在IFW-D上完成的。 在NCSU上也进行了一组广泛的密度功能理论（DFT）计算和大规模分子动力学（MD）模拟，而基于机制的基于机制和相关的建模是在NCSU，UV和IFW-D进行的。 NCSU，UV和IFW-D之间的研究生交换以及教师互动构成了该项目的重要组成部分。