Dislocation Damping and Defect Friction Damping in Magnesium: Molecular Dynamics Study

被引：8

作者：

Zhai, Jingyu ^{[1
]}

Song, Xinyuan ^{[1
]}

Xu, Anyang ^{[1
]}

Chen, Yugang ^{[2
]}

Han, Qingkai ^{[1
]}

机构：

[1] Dalian Univ Technol, Sch Mech Engn, Dalian 116024, Peoples R China

[2] Korea Adv Inst Sci & Technol, Dept Mech Engn, Daejeon 34141, South Korea

来源：

METALS AND MATERIALS INTERNATIONAL | 2021年 / 27卷 / 06期

基金：

中国国家自然科学基金;

关键词：

Mg alloy; Damping; Dislocation; Fiction; Microscopic defect; INTERNAL-FRICTION; MECHANICAL-PROPERTIES; HEAT-TREATMENT; AS-CAST; CAPACITY; ALLOY;

D O I：

10.1007/s12540-019-00566-y

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this study, the molecular dynamics method was used to study the damping mechanism in Mg alloys at the atomic scale. The energy dissipated by the nucleation and motion of dislocations and by defects friction, and the effect of defects, such as vacancies, cracks, and grain boundaries, on them were studied. The study shows that different kinds of defect have different effects on the dislocation damping and defect friction damping. And then, the effect of strain amplitude and temperature on damping capacity of Mg was studied. The result shows that the amplitude independent damping is caused by defect friction and the amplitude dependent damping is mainly caused by the nucleation and motion of dislocation; the damping of Mg increased exponentially with the temperature, and the damping peck appeared at 440 K is attributed to the appearance of dislocations at the grain boundaries which may be caused by boundaries self-diffusion. Graphic

引用

页码：1458 / 1468

页数：11

共 46 条

[1] The evaluation of the damping characteristics of a hard coating on titanium
Blackwell, Christopher
Palazotto, Anthony
George, Tommy J.
Cross, Charles J.
[J]. SHOCK AND VIBRATION, 2007, 14 (01) : 37 - 51
[2] BOAN J, 2015, MAT SCI ENG A-STRUCT, V644, P121, DOI DOI 10.1016/j.msea.2015.07.055
[3] Synergistic corrosion protection for AZ31 Mg alloy by anodizing and stannate post-sealing treatments
Choi, Yun-Il
Salman, Salah
Kuroda, Kensuke
Okido, Masazumi
[J]. ELECTROCHIMICA ACTA, 2013, 97 : 313 - 319
[4] Enhanced damping capacity of magnesium alloys by tensile twin boundaries
Cui, Yujie
Li, Yunping
Sun, Shihai
Bian, Huakang
Huang, Hua
Wang, Zhongchang
Koizumi, Yuichiro
Chiba, Akihiko
[J]. SCRIPTA MATERIALIA, 2015, 101 : 8 - 11
[5] SEMIEMPIRICAL, QUANTUM-MECHANICAL CALCULATION OF HYDROGEN EMBRITTLEMENT IN METALS
DAW, MS
BASKES, MI
[J]. PHYSICAL REVIEW LETTERS, 1983, 50 (17) : 1285 - 1288
[6] Diqing W, 2013, MATER ENG, V42, P585
[7] Effect of heat treatment on internal friction in ECAP processed commercial pure Mg
Fan, G. D.
Zheng, M. Y.
Hu, X. S.
Xu, C.
Wu, K.
Golovin, I. S.
[J]. JOURNAL OF ALLOYS AND COMPOUNDS, 2013, 549 : 38 - 45
[8] Improved mechanical property and internal friction of pure Mg processed by ECAP
Fan, G. D.
Zheng, M. Y.
Hu, X. S.
Xu, C.
Wu, K.
Golovin, I. S.
[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2012, 556 : 588 - 594
[9] A SIMPLE EMPIRICAL N-BODY POTENTIAL FOR TRANSITION-METALS
FINNIS, MW
SINCLAIR, JE
[J]. PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES, 1984, 50 (01): : 45 - 55
[10] Measurement of crack induced damping of cast magnesium alloy AZ91
Göken, J
Letzig, D
Kainer, KU
[J]. JOURNAL OF ALLOYS AND COMPOUNDS, 2004, 378 (1-2) : 220 - 225

← 1 2 3 4 5 →