Mechanical Spectroscopy of Ultrafine Grained Copper

被引：14

作者：

Golovin, I. S. ^{[1
]}

Estrin, Y. ^{[2
,3
]}

机构：

[1] Natl Res Technol Univ, Moscow Inst Steel & Alloys, Moscow 119049, Russia

[2] Monash Univ, ARC Ctr Design Light Metals, Dept Mat Engn, Clayton, Vic 3800, Australia

[3] CSIRO Div Process Sci & Engn, Clayton, Vic, Australia

来源：

NANOMATERIALS BY SEVERE PLASTIC DEFORMATION: NANOSPD5, PTS 1 AND 2 | 2011年 / 667-669卷

关键词：

internal friction; equal channel angular pressing; grain boundary; INTERNAL-FRICTION; RECRYSTALLIZATION; CU;

D O I：

10.4028/www.scientific.net/MSF.667-669.857

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Temperature and amplitude dependent internal friction (TDIF and ADIF) in ultrafine-grained copper (99.95% Cu) processed by 1, 4, or 8 passes of equal channel angular pressing (route B-C and then subjected to annealing was investigated by means of mechanical spectroscopy. A dynamical mechanical analyzer DMA Q800 was used. The tests covered the temperature range from -100 to 550 degrees C, the strain amplitude range from 10(-6) to 10(-3), and the frequency range from 0.05 to 100 Hz. Two internal friction peaks were observed. They were explained by structural relaxation due to the recrystallisation process and by thermally activated grain boundary relaxation with a broad distribution of relaxation times. Increased amplitude dependent damping in ultrafine-grained copper is believed to be associated with a dislocation mechanism, rather than a grain boundary mechanism.

引用

页码：857 / +

页数：2

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