Structurally complex alloy phases: Structure, defects and mechanical properties

结构复杂的合金相：结构、缺陷和机械性能

• 批准号: 5397319
• 负责人: Professor Dr. Knut W. Urban
• 金额: --
• 依托单位: PGI-5: Mikrostrukturforschung
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2002
• 资助国家: 德国
• 起止时间: 2001-12-31 至 2006-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5397319?language=en
• 关键词: Structurally; complex; alloy; phases; Structure

This project focuses on the experimental investigation of the structure, defects and plastic deformation properties of a number of selected structurally complex alloy phases (SCAP) with giant unit cells. Materials of choice are e.g. _ -Al3Mg2, C2-Al-Pd-Fe and the orthorhom-bic_ '- and _ -phases in the Al-Pd-Mn system. Other phases will be introduced during the project. These materials will be grown in single phase and, if possible, single crystalline form. The structure will be characterized crystallographically employing X-ray diffraction, electron diffraction and high-resolution electron microscopy. Grown-in lattice defects will be characterized by transmission electron microscopy (TEM) both in Bragg contrast and in high-resolution. Single-phase and single-crystalline samples will be deformed plastically at ele-vated temperatures in an uniaxial testing machine. In order to clarify the nature of the deformation process quantitatively, the macroscopic plastic deformation behavior will be characterized and the thermodynamic activation parameters of the plastic deformation process will be determined. The deformation-induced defect structure, e.g. dislocations, planar faults and shear lines, will be investigated by high-resolution TEM. Bragg-contrast and convergent-beam techniques will be applied for the determination of dislocation arrangements, strain fields and Burgers vectors. This will allow to gain insight into the currently unknown plastic deformation mechanisms of these materials.

该项目的重点是一些选定的结构复杂的合金相（SCAP）与巨晶胞的结构，缺陷和塑性变形性能的实验研究。所选择的材料例如是Al-Pd-Mn系中的_ -Al_3 Mg_2、C_2-Al-Pd-Fe和正交_′-和_ -相。其他阶段将在项目期间进行。这些材料将以单相生长，如果可能的话，以单晶形式生长。将采用X射线衍射、电子衍射和高分辨率电子显微镜对结构进行晶体学表征。生长在晶格缺陷的特点是透射电子显微镜（TEM）在布拉格对比度和高分辨率。单相单晶试样在高温下在单轴试验机上进行塑性变形。为了定量地阐明变形过程的本质，将表征宏观塑性变形行为并确定塑性变形过程的热力学激活参数。变形引起的缺陷结构，如位错，平面断层和剪切线，将通过高分辨率TEM研究。布拉格对比度和会聚束技术将被应用于位错排列，应变场和伯格斯矢量的测定。这将有助于深入了解这些材料目前未知的塑性变形机制。