Effect of frequency on amplitude-dependent internal friction in niobium

被引：7
|
作者：
Ide, Naoki [1 ]
Atsumi, Tomohiro [1 ]
Nishino, Yoichi [1 ]
机构：
[1] Nagoya Inst Technol, Dept Mat Sci & Engn, Showa Ku, Nagoya, Aichi 4668555, Japan
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2006年 / 442卷 / 1-2期
关键词：
internal friction; damping; microplasticity; flow stress; strain rate; non-destructive testing;
D O I：
10.1016/j.msea.2006.03.117
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Amplitude-dependent internal friction (ADIF) was measured in a polycrystalline niobium using four modes of flexural vibration from the fundamental to the third-order resonance at room temperature. The ADIF was detected in each vibration mode. The internal-friction versus strain-amplitude curve of the ADIF shifted to a larger strain-amplitude range as frequency increased. The stress-strain curves were derived from the ADIF data, and the microplastic flow stress defined as the stress required to produce a plastic strain of 1 x 10(-9) was read from the stress-strain curves. It was found that the microplastic flow stress was proportional to the frequency. (c) 2006 Elsevier B.V. All rights reserved.
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页码：156 / 159
页数：4
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