项目名称: 镁和镁合金的晶界内耗研究
项目编号: No.11274309
项目类型: 面上项目
立项/批准年度: 2013
项目学科: 数理科学和化学
项目作者: 蒋卫斌
作者单位: 中国科学院合肥物质科学研究院
项目金额: 82万元
中文摘要: 晶界内耗峰是我国科学家葛庭燧先生首先发现的。关于面心立方晶系的晶界内耗峰微观机制已有大量的研究,但对其它晶系材料的晶界内耗研究相对较少。纯镁属于密积六方晶体结构,镁合金在很多工业中有广泛的应用。本项目拟在前期面心立方晶系工作的基础上,用纯镁和镁合金的双晶试样,研究其不同晶界类型和不同取向差晶界的内耗,以揭示晶界弛豫参量与晶界类型的关系,以及与不同晶体结构的关系。本项目的研究结果不仅能够进一步阐明晶界内耗峰的微观机制和影响因素,而且可以对镁合金的研制提供有益的资料。
中文关键词: 晶界;内耗;純镁;双晶;
英文摘要: The grain boundary internal friction peak was discovered by Prof Ke. the mechanism of the peak has been extensively studied in fcc structured metals,but much less studied in those with other crystal structures. Pure magnesium has a close-packed hexagonal structure, and the Mg alloys are extensively used in many applications. On the basis of our works of fcc metals, this project attempts to study the grain boundary relaxation for different types of grain boundaries with different misorientations by using bicrystals of Mg and Mg alloys.So that we can reveal the dependenc of the relaxation parameters on boundary type and crystal structure.The results obtained not only can further clarify the microscopic mechanism of the grain boundary internal friction peak, but also provide useful infromation for the deveploment of Mg alloys.
英文关键词: grain boundary;internal friction;magnesium;bicrystals;