Softening and Microstructural Coarsening without Twin Formation in FCC Metals with Low Stacking Fault Energy after Processing by High-Pressure Torsion
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- Matsunaga Hirotaka
- Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University
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- Horita Zenji
- Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University
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Abstract
Gold (Au), silver (Ag) and copper (Cu) were severely deformed through the process of high pressure torsion (HPT). The grain sizes were reduced to the submicrometer range and the hardness increased significantly by the HPT process. However, after holding at room temperature, Au and Ag exhibited grain growth and thus softening without heating. The softening and microstrcutural coarsening occurred rather quickly in Ag and moderately in Au but nothing changed in Cu even after keeping for prolonged time. No twins were formed along with the grain growth in the HPT-processed Au and Ag. High density lattice defects and enhanced diffusivity in the metals are responsible for such an unusual softening behavior.
Journal
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- MATERIALS TRANSACTIONS
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MATERIALS TRANSACTIONS 50 (7), 1633-1637, 2009
The Japan Institute of Metals and Materials
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Details 詳細情報について
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- CRID
- 1390001204249380992
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- NII Article ID
- 10025153652
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- NII Book ID
- AA1151294X
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- ISSN
- 13475320
- 13459678
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- NDL BIB ID
- 10265664
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed