Grain boundary diffusion and viscous flow governed mechanical relaxation in polycrystalline materials | |
其他题名 | 多晶体晶界扩散与晶界粘滞变形主导的力学弛豫 |
Duan CC(段闯闯); Wei YJ(魏宇杰) | |
发表期刊 | SCIENCE CHINA-MATERIALS |
2022-05 | |
卷号 | 65期号:5页码:1403-1412 |
ISSN | 2095-8226 |
摘要 | Grain boundary (GB) diffusion and viscous flow play dominant roles in mechanical relaxation of polycrystalline materials. The pioneering work of Zener and Ke, by accounting for relaxation in GBs by viscous shearing, predicts a single peak in the internal friction spectrum. Later investigations show the existence of two to three peaks in the internal friction spectrum when taking into account both GB diffusion and viscous flow for dissipation. In this paper, we further identify the characteristic relaxation modes in polycrystalline materials. We illustrate that competitive viscous flow and diffusion for normal stress relaxation give rise to distinct dependence of relaxation time on grain size. We construct an internal friction spectrum mapping based on the competitive deformation mechanisms including viscous flow in both normal and tangential directions and GB diffusion. The essential features of internal friction spectrum of polycrystalline materials from our analysis are consistent with available experimental observations. These findings may also be applicable to study relaxation dynamics of other material systems such as metallic glasses and porous materials. |
其他摘要 | 晶界扩散和晶界粘滞变形是多晶材料发生力学弛豫的重要原因, Zener和葛庭燧的开创性工作,分别解释和从实验上验证了晶界粘滞滑动引起的内耗峰.后续研究表明,当同时考虑晶界粘滞与扩散时,多晶体内耗谱上可能出现两个,甚至是三个内耗峰.本研究通过阐明晶界扩散与粘滞变形在晶界法向应力弛豫中的竞争关系,理论上给出了多内耗峰的物理机制、明确晶界变形的主导模式与内耗峰之间的关系,并揭示了多晶体弛豫时间的不同晶粒尺寸依赖性.本工作有助于金属玻璃、多孔介质等非均质材料力学弛豫行为的研究. |
关键词 | grain boundary diffusion viscous flow internal friction spectrum polycrystalline materials Zener-Ke dissipation |
学科领域 | Materials Science, Multidisciplinary |
DOI | 10.1007/s40843-021-1837-9 |
收录类别 | SCI ; EI ; CSCD |
语种 | 英语 |
WOS记录号 | WOS:000726264700001 |
项目资助者 | National Natural Science Foundation of China [11988102, 11790291] |
CSCD记录号 | CSCD:7279672 |
论文分区 | 二类/Q1 |
力学所作者排名 | 1 |
RpAuthor | Wei, YJ (corresponding author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China. |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://dspace.imech.ac.cn/handle/311007/90219 |
专题 | 非线性力学国家重点实验室 |
通讯作者 | Wei YJ(魏宇杰) |
作者单位 | 1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China |
推荐引用方式 GB/T 7714 | Duan CC,Wei YJ. Grain boundary diffusion and viscous flow governed mechanical relaxation in polycrystalline materials[J]. SCIENCE CHINA-MATERIALS,2022,65,5,:1403-1412. |
APA | Duan CC,&Wei YJ.(2022).Grain boundary diffusion and viscous flow governed mechanical relaxation in polycrystalline materials.SCIENCE CHINA-MATERIALS,65(5),1403-1412. |
MLA | Duan CC,et al."Grain boundary diffusion and viscous flow governed mechanical relaxation in polycrystalline materials".SCIENCE CHINA-MATERIALS 65.5(2022):1403-1412. |
条目包含的文件 | 下载所有文件 | |||||
文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 | ||
Jp2022FA407_2022_Gra(2497KB) | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | 浏览 下载 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论