Mechanical Spectroscopy of Ultrafine Grained Copper
Temperature and amplitude dependent internal friction (TDEF and ADIF) in ultrafinegrained copper (99.95% Cu) processed by 1,4, or 8 passes of equal channel angular pressing (route Be) 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 ℃, 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.
I.S.Golovin Y.Estrin
National Research Technological University Moscow Institute of Steel and AlloysLeninskij ave.4,119 ARC Centre for Design in Light Metals,Department of Materials Engineering,Monash University CSIRO Di
国际会议
5th International Conference on Nanomaterials by Severe Plastic Deformation(第五届剧烈塑性变形纳米材料国际会议)
南京
英文
857-862
2011-03-01（万方平台首次上网日期，不代表论文的发表时间）