原子集群转动机制的原子尺度显微研究

项目名称： 原子集群转动机制的原子尺度显微研究

项目编号： No.51301215

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 一般工业技术

项目作者： 姜山

作者单位： 重庆文理学院

项目金额： 25万元

中文摘要： 孪生是六方结构材料的重要塑形变形方式之一。然而尽管人们做了大量的实验研究工作，但对孪生机理的认识却存在着不少的分歧，这在很大程度上阻碍了对六方结构材料塑性变形机制研究的进展。我们提出的原子集群转动机制是一个以简洁、直观为特点的新型物理模型。该机制抛开了那种孤立研究个别原子的做法，而是将具有特定架构的原子集群作为研究的最小单元。利用该机制几乎对所有与孪生有关的现象都可以给予非常合理的解释。然而由于经费的限制，该机制的探索工作曾一度停留在理论研究阶段。事实上，经过几年的努力我们已经摸索出了一个获取证实该机制的直接证据的方法，其核心的思想是在具有孪生组织试样的特定区域进行原子尺度的显微观察，采集原子集群的原子相数据。虽然其思路比较简单，但项目的具体实施却可能遭遇很大的挑战，需要较高的实验技巧。本项目的实施将对整个六方结构材料塑形变形机制研究的进展具有非常重要的意义。

中文关键词： 六方结构；孪生；原子尺度；机理；镁合金

英文摘要： Twinning is one of the important ways of plastic deformation for hexagonal-close packed (HCP) materials. However the enormous amount of experimental research work was carried out, there exist many differences among the understandings of the mechanism of the twinning and which has impeded the progress of the researches on the mechanism of the plastic deformation of the HCP materials. The mechanism of atom group rotation that we have established is a absolutely new physical model with the features of brevity and intuition. The mechanism of atom group rotation is not the kind way focused on the individual atoms isolatedly, but regards the atomic group with specific structure as the smallest unit to study. The mechanism can almost be used to give a reasonable explanation to any twinning phenomenon. However, due to the limitations of funding, the exploration work of the mechanism is still stuck in the phase of theoretical researches. In fact, we have got an idea to get the direct evidence to verify the correctness of the mechanism through several years of effort， that is to get the pictures of the atom group on some special area of the sample with twins. Though the idea seems simple, it will meet somen challenges and need the advanced technique of the researchers. The implement of the project will play a very importa

英文关键词： hexagonal close-packed structure；twinning；atomic scale；mechanism；magnesium alloys