镁合金中LPS相的微结构与力学性能研究

项目名称： 镁合金中LPS相的微结构与力学性能研究

项目编号： No.50861002

项目类型： 地区科学基金项目

立项/批准年度： 2009

项目学科： 无线电电子学、电信技术

项目作者： 唐壁玉

作者单位： 广西大学

项目金额： 28万元

中文摘要： 本项目研究系统地揭示了镁合金中LPS相中原子尺度微结构特征特别各合金元素偏析行为和空间分布，以及各种LPS相形成机制及其相对稳定性，发现了Y和Zn富集在LPS相中的层错层或层错邻层，并且LPS相点阵奇变的原因是锌元素在堆垛序和化学序上的非对称性；研究还揭示了镁合金中LPS相缺陷层结构模型、特征及其堆垛缺陷的物理本质，发现了每一种LPS相中只能存在一种类型层错结构和另一种 ABCA构造模块，以及各种LPS相的相互联系以及相互转化的趋势、规律和机制；研究和揭示了LPS相力学性能参数与结构特征特别是电子性能的微观本质联系，发现LPS相的力学性能并不很突出，与纳米镁基体颗粒和纳米Mg24Y5颗粒的有效结合才能体现合金的优异力学性能。

中文关键词： LPS相；微结构；稳定性；缺陷层结构；力学性能

英文摘要： The research of this project revealed the microstructure feature of LPS phase on atomistic scale, especially the segregation and distribution of alloying elements in LPS phase, as well as the formation mechanism and the relative stability of various LPS phase. It was found that Y and Zn atoms in LPS phases were enriched at the fault layers or the near fault layer, and the lattice distortion of the LPS phases originated from the non-symmetry of the stacking order and chemical order. The present investigations still reaveled that the structural model, feature and physical mechanism of stacking faults in LPS phases.It was further found that in each LPS phase, only one type of stacking fault was presented.Another building block for LPS phases was also modeled. The studies also found the feature of PLS fault structure, and the tendency, condition and mechanism for inter-transformation of various LPS phase. Moreover,the mechanical property and its dependence on the microstructure feature of LPS phaseespecially the electronic mechanism have been further revealed, It was found that the mechanical properties of pure LPS phases was not very excellent, the novel mechanical properties of alloys depented on the good combination of LPS phases with nanoscale Mg matrix particles and nanoscale Mg24Y5 particles.

英文关键词： Long period phase; Microstructure; stability; Fault structure; Mechanical property