Diffusion phenomena in nano-crystalline Cu produced by severe plastic deformation

严重塑性变形产生的纳米晶铜中的扩散现象

• 批准号: 28669489
• 负责人: Professor Dr. Guido Schmitz
• 金额: --
• 依托单位: Institut für Materialphysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/28669489?language=en
• 关键词: Diffusion; phenomena; nano; crystalline; Cu

Since their invention in early eighties, nano-crystalline materials attract growing interest in view of their beneficial properties that rely on an increased amount of grain boundaries. Among different production routes, the Equal-Channel Angular Pressing (ECAP) is an attractive method to prepare bulk ultra-fine-grained materials. It is argued that non-equilibrium grain boundaries are created by the ECAP procedure. However, the kinetic properties of such materials are almost not investigated. How fast is the diffusion along grain boundaries in comparison to their conventional coarse-grained counterparts indeed? What is the relation between the structure and the kinetic properties? These and similar problems will be solved in the proposed project. The key point of the project will be a careful and extensive radio tracer investigation of grain boundary diffusion of Cu, Ag, and Ni tracers in nano-crystalline Cu and Cu-Zr alloys produced by the ECAP. The experiments will be complemented by analytical high-resolution transmission electron microscopy. As the goal, reliable experimental data should be derived on the kinetic and thermodynamic properties of internal interfaces in ECAP materials.

自八十年代初发明以来，纳米晶体材料由于其依赖于增加的晶界量的有益特性而吸引了越来越多的兴趣。在各种制备方法中，双通道转角挤压（ECAP）是制备块体超细晶材料的一种有吸引力的方法。有人认为，非平衡晶界的ECAP过程中创建。然而，此类材料的动力学性质几乎没有研究。与传统的粗晶粒对应物相比，沿沿着晶界的扩散到底有多快？结构和动力学性质之间的关系是什么？这些和类似的问题将在拟议的项目中得到解决。该项目的重点将是对ECAP生产的纳米晶Cu和Cu-Zr合金中Cu，Ag和Ni示踪剂的晶界扩散进行仔细和广泛的放射性示踪研究。这些实验将辅之以高分辨率透射电子显微镜分析。为此，必须获得有关ECAP材料内部界面动力学和热力学性质的可靠实验数据。

项目成果

Nano- and micro-scale free volume in ultrafine grained Cu-1 wt.%Pb alloy deformed by equal channel angular pressing

• DOI: 10.1016/j.actamat.2009.07.066
• 发表时间: 2009-11-01
• 期刊: ACTA MATERIALIA
• 影响因子: 9.4
• 作者: Divinski, Sergiy V.;Ribbe, Jens;Wilde, Gerhard
• 通讯作者: Wilde, Gerhard

Ultrafast diffusion and internal porosity in ultrafine-grained copper―lead alloy prepared by equal channel angular pressing

• DOI: 10.1016/j.scriptamat.2009.03.029
• 发表时间: 2009-07
• 期刊: Scripta Materialia
• 影响因子: 6
• 作者: Jens Ribbe;D. Baither;G. Schmitz;S. Divinski

Percolating network of ultrafast transport channels in severely deformed nanocrystalline metals

• DOI: 10.1063/1.3211966
• 发表时间: 2009-09-15
• 期刊: JOURNAL OF APPLIED PHYSICS
• 影响因子: 3.2
• 作者: Divinski, Sergiy V.;Ribbe, Jens;Wilde, Gerhard
• 通讯作者: Wilde, Gerhard