Frequency-dependent mechanical damping in alloys

被引：7
|
作者：
Ranganathan, Raghavan [1 ]
Shi, Yunfeng [1 ]
Keblinski, Pawel [1 ]
机构：
[1] Rensselaer Polytech Inst, Dept Mat Sci & Engn, Troy, NY 12180 USA
来源：
PHYSICAL REVIEW B | 2017年 / 95卷 / 21期
基金：
美国国家科学基金会;
关键词：
MOLECULAR-DYNAMICS; THERMAL-CONDUCTIVITY; METALLIC GLASSES; POWER-LAW; PROPAGATION; RELAXATION; EXCITATIONS; ATTENUATION; SCATTERING; BEHAVIOR;
D O I：
10.1103/PhysRevB.95.214112
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We perform oscillatory shear simulations to determine the loss modulus for three solids with identical interaction yet distinct structures: ordered, random, and glassy alloys. Random and glassy alloys show more pronounced high-frequency loss in the THz regime than the ordered alloy. Ordered and random alloys exhibit a power-law decay in damping strength as frequency decreases over nearly five decades. Glassy alloy, with a limited frequency range of power-law decay, retains significant damping at low frequencies extending down to similar to 100MHz due to slow irreversible deformation of local clusters.
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收藏
页数：8
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