期刊
JOURNAL OF MATERIALS SCIENCE
卷 57, 期 34, 页码 16490-16506出版社
SPRINGER
DOI: 10.1007/s10853-022-07637-3
关键词
-
资金
- Projekt DEAL
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [441110175UR 32/28-1]
Nanostructured tantalum-based dental implants have superior biocompatibility and bioactivity compared to titanium-based implants. However, the plastic deformation mechanisms of these implants are not fully understood. In this study, molecular dynamics simulation is used to explore the microstructural evolution of pure polycrystalline tantalum samples under tensile loading, revealing different deformation mechanisms for samples with different grain sizes.
Nanostructured tantalum (Ta)-based dental implants have recently attracted significant attention thanks to their superior biocompatibility and bioactivity as compared to their titanium-based counterparts. While the biological and chemical aspects of Ta implants have been widely studied, their mechanical features have been investigated more rarely. Additionally, the mechanical behavior of these implants and, more importantly, their plastic deformation mechanisms are still not fully understood. Accordingly, in the current research, molecular dynamics simulation as a powerful tool for probing the atomic-scale phenomena is utilized to explore the microstructural evolution of pure polycrystalline Ta samples under tensile loading conditions. Various samples with an average grain size of 2-10 nm are systematically examined using various crystal structure analysis tools to determine the underlying deformation mechanisms. The results reveal that for the samples with an average grain size larger than 8 nm, twinning and dislocation slip are the main sources of any plasticity induced within the sample. For finer-grained samples, the activity of grain boundaries-including grain elongation, rotation, migration, and sliding-are the most important mechanisms governing the plastic deformation. Finally, the temperature-dependent Hall-Petch breakdown is thoroughly examined for the nanocrystalline samples via identification of the grain boundary dynamics.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据