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.

引用

页数：8

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