期刊
JOURNAL OF NON-CRYSTALLINE SOLIDS
卷 577, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jnoncrysol.2021.121318
关键词
Diamond-like carbon; Uniaxial compression; Deformation mechanism; Microstructural evolution; Molecular dynamics
资金
- National Natural Science Foundation of China [51905548]
- open project of State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University [SV2019-KF-24]
- High Performance Computing Center of Central South University
The mechanical properties and deformation mechanisms of diamond-like carbon (DLC) films were studied through molecular dynamics simulation. It was found that sp(2)-sp(3) transition led to the compressive failure of the films. The strength and ductility of the films were influenced by temperature and compression strain rate.
The uniaxial compression tests of diamond-like carbon (DLC) films are conducted via molecular dynamics to investigate their mechanical properties and deformation mechanisms by considering different factors including strain rates, temperatures, void defects and compliance. It is found that during the compression, large sp(3)C clusters expand themselves by annexing neighboring sp(2)C atoms which experience sp(2)-sp(3) transition. Moreover, the sp(3)C-sp(3)C bonds along the direction perpendicular to the compressive direction are elongated and the rupture of such bonds leads to the compressive failure of DLC films. Furthermore, the stress relief of DLC films is the result of competition between internal relative slip and diffusion relaxation. The relative slip is dominant with low temperature and high compression strain rate, which makes the DLC films own high strength and exhibit brittleness. However, with high temperature and low strain rate, these films become ductile and their strength are degraded due to the activation of diffusion relaxation.
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