Instantaneous creep in face-centered cubic metals at ultralow strain rates by a high-resolution strain measurement

Junjie Shen, Ikeda Kenichi, Satoshi Hata, Hideharu Nakashima

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Abstract

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 ultralow strain rates dot \varepsilon ≤ 10-10 s-1 and 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 μm, 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 μm, and low-purity aluminum, 2N Al, with d g= 25 μm, creep shows viscous behavior and may be related to 'low temperature grain boundary sliding'. For high-purity copper, 4N Cu, with d g= 40 μm 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.

Original languageEnglish
Pages (from-to)1096-1100
Number of pages5
JournalJournal Wuhan University of Technology, Materials Science Edition
Volume28
Issue number6
DOIs
Publication statusPublished - Dec 1 2013

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Strain measurement
Strain rate
Creep
Metals
Recovery
Grain boundary sliding
Stacking faults
Aluminum
Copper
Temperature
Experiments

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

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title = "Instantaneous creep in face-centered cubic metals at ultralow strain rates by a high-resolution strain measurement",
abstract = "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 ultralow strain rates dot \varepsilon ≤ 10-10 s-1 and 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 μm, 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 μm, and low-purity aluminum, 2N Al, with d g= 25 μm, creep shows viscous behavior and may be related to 'low temperature grain boundary sliding'. For high-purity copper, 4N Cu, with d g= 40 μm 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.",
author = "Junjie Shen and Ikeda Kenichi and Satoshi Hata and Hideharu Nakashima",
year = "2013",
month = "12",
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doi = "10.1007/s11595-013-0826-y",
language = "English",
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journal = "Journal Wuhan University of Technology, Materials Science Edition",
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T1 - Instantaneous creep in face-centered cubic metals at ultralow strain rates by a high-resolution strain measurement

AU - Shen, Junjie

AU - Kenichi, Ikeda

AU - Hata, Satoshi

AU - Nakashima, Hideharu

PY - 2013/12/1

Y1 - 2013/12/1

N2 - 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 ultralow strain rates dot \varepsilon ≤ 10-10 s-1 and 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 μm, 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 μm, and low-purity aluminum, 2N Al, with d g= 25 μm, creep shows viscous behavior and may be related to 'low temperature grain boundary sliding'. For high-purity copper, 4N Cu, with d g= 40 μm 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.

AB - 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 ultralow strain rates dot \varepsilon ≤ 10-10 s-1 and 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 μm, 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 μm, and low-purity aluminum, 2N Al, with d g= 25 μm, creep shows viscous behavior and may be related to 'low temperature grain boundary sliding'. For high-purity copper, 4N Cu, with d g= 40 μm 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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