Materials World Network: Mechanisms leading to nanometer-sized materials

材料世界网络：纳米材料的形成机制

• 批准号: 73725602
• 负责人: Professor Dr.-Ing. Jürgen Eckert
• 金额: --
• 依托单位: Lehrstuhl für Materialphysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2008
• 资助国家: 德国
• 起止时间: 2007-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/73725602?language=en
• 关键词: Materials; World; Network; Mechanisms; leading

Deformation induced grain refinement has been revealed in pure Cu by rolling at ambient and cryogenic temperature and low temperature annealing. In addition, Zn decreases the stacking fault energy (SFE) from 78 (for pure Cu) to 14 mJ/m2 (Cu-30 wt.% Zn) and enhances the grain refinement. In this project, nano-/ultrafine grained Cu-/Cu-Zn alloys will be synthesized by rolling and low temperature annealing, in order to overcome dimension limitations of specialized critical mechanical tests for strength and ductility, which are poorly understood for such NC/UFG materials. Characterization of the microstructure will be performed down to the atomic level by thorough and systematic analysis; and mechanical properties of these materials will be studied under tension, compression and torsion. In-situ deformation studies under scanning and transmission electron microscopic observation will be performed to reveal the deformation mechanisms at different length-scales. The nano-/ultrafine structures obtained by various processing routes (rolled/annealed samples prepared at IFW and specimens produced by ball milling (NCSU) and equal channel angular pressing/ high pressure torsion (UV)) will be compared in order to reveal the influence of processing induced structural defects on the ease of grain refinement in Cu-/Cu-Zn alloys with different SFE and deformation mechanisms as a function of grain size and SFE. The influence of alloy composition and processing conditions, i.e., rolling temperature, severity of deformation, on nanostructure development, and final grain size will be compared in these Cu/Cu-Zn alloys with different SFE.

变形诱导的晶粒细化已在纯CU中通过在环境和低温温度和低温退火下滚动来揭示。另外，Zn将堆叠断层能量（SFE）从78（对于纯CU）降低到14 MJ/M2（Cu-30 wt。％Zn），并增强了谷物的细化。在该项目中，将通过滚动和低温退火来合成纳米/超细粒子Cu-/cu-Zn合金，以克服针对强度和延展性的专业临界机械测试的尺寸限制，对于此类NC/UFG材料而言，这些测试的强度和延展性很差。微观结构的表征将通过彻底和系统的分析来直至原子水平；这些材料的机械性能将在张力，压缩和扭转下进行研究。将在扫描和透射电子显微镜观察下进行原位变形研究，以揭示不同长度尺度上的变形机制。通过各种处理途径（在IFW上制备的滚动/退火样品以及由球铣削产生的样本（NCSU）（NCSU）和相等的通道角度按压/高压扭转（UV）所产生的标本（UV）所产生的标本（以揭示加工诱导诱导的结构诱导的影响的影响）的影响，将与CU-Z的影响相比作为晶粒尺寸和SFE的函数。合金组成和加工条件的影响，即滚动温度，变形的严重程度，对纳米结构的发育和最终晶粒尺寸，将在具有不同SFE的CU/CU-ZN合金中进行比较。