Instantaneous Creep in Face-centered Cubic Metals at Ultra- low Strain Rates by a High-resolution Strain Measurement
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2013年第6期
论文作者：SHEN Junjie Ikeda Kenichi Hata Satoshi Nakashima Hideharu
文章页码：1096 - 1100
摘 要：Instantaneous creep in face-centered cubic metals, 5N Al（99.999%）, 2N Al（99%） and 4N Cu（99.99%） with different grain sizes, was firstly investigated by sudden stress-change experiments at ultra- low strain rates 10 10s 1and temperature T < 0.32 T m. The experimental results indicate that the observed instantaneous creep is strongly dependent on grain size, the concentration of impurity, and stacking fault energy. Creep in high-purity aluminum, 5N Al, with a very large grain size, d g > 1600 m, shows non-viscous behavior, and is controlled by the recovery of dislocations in the boundary of dislocation cells. On the other hand, for 5N Al with a small grain size, d g =30 m, and low-purity aluminum, 2N Al, with d g = 25 m, creep shows viscous behavior and may be related to ’low temperature grain boundary sliding’. For high-purity copper, 4N Cu, with d g = 40 m and lower stacking fault energy, creep shows a non-viscous behavior, and is controlled by the recovery process of dislocations. For all of the samples, creep shows anelastic behavior.
SHEN Junjie1，Ikeda Kenichi2，Hata Satoshi2，Nakashima Hideharu2
1. School of Mechanical Engineering,Tianjin University of Technology2. Department of Electrical and Materials Science,Faculty of Engineering Sciences,Kyushu University
摘 要：Instantaneous creep in face-centered cubic metals, 5N Al（99.999%）, 2N Al（99%） and 4N Cu（99.99%） with different grain sizes, was firstly investigated by sudden stress-change experiments at ultra- low strain rates 10 10s 1and temperature T < 0.32 T m. The experimental results indicate that the observed instantaneous creep is strongly dependent on grain size, the concentration of impurity, and stacking fault energy. Creep in high-purity aluminum, 5N Al, with a very large grain size, d g > 1600 m, shows non-viscous behavior, and is controlled by the recovery of dislocations in the boundary of dislocation cells. On the other hand, for 5N Al with a small grain size, d g =30 m, and low-purity aluminum, 2N Al, with d g = 25 m, creep shows viscous behavior and may be related to ’low temperature grain boundary sliding’. For high-purity copper, 4N Cu, with d g = 40 m and lower stacking fault energy, creep shows a non-viscous behavior, and is controlled by the recovery process of dislocations. For all of the samples, creep shows anelastic behavior.
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