Superplastic-Like Behavior in Medium Grained and Single Crystalline Al-Mg Solid Solution Alloys
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- Ito Tsutomu
- Department of Materials Science and Engineering, Faculty of Engineering, Shibaura Institute of Technology
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- Shibasaki Satoshi
- Department of Materials Science and Engineering, Faculty of Engineering, Shibaura Institute of Technology
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- Koma Masayuki
- Department of Materials Science and Engineering, Faculty of Engineering, Shibaura Institute of Technology
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- Otsuka Masahisa
- Department of Materials Science and Engineering, Faculty of Engineering, Shibaura Institute of Technology
Bibliographic Information
- Other Title
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- 中間粒度および単結晶Al-Mg合金における超塑性的挙動
- チュウカン リュウド オヨビ タンケッショウ Al Mg ゴウキン ニ オケル チョウソセイテキ キョドウ
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Abstract
High temperature ductility of medium grained and single crystalline Al-6 mol%Mg solid solution alloys has been investigated. It is found that enhanced ductility occurs not only in polycrystalline specimens having grain diameter of 70 μm and 165 μm but also in single crystalline ones in the temperature range above 523 K; maximum elongation for 70 μm grained, 165 μm grained and single crystalline specimens are, respectively, 349%(at 723 K), 322%(at 723 K) and 326%(at 673 K). Experimentally determined strain rate sensitivity index of about 0.3, together with the activation energy for deformation, suggests the solute drag motion of dislocations as a rate controlling process, which in turn is accommodated by the grain boundary sliding. In other words, the high ductility observed here should be referred to as superplastic-like elongation, that is, the phenomenon that has been reported in some solid solution alloys with a large misfit parameter. The fact that the strain rate for largest elongation tends to increase with decreasing grain size may be ascribed to the relative increase in the contribution of grain boundary sliding to the total strain.
Journal
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- Journal of the Japan Institute of Metals and Materials
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Journal of the Japan Institute of Metals and Materials 66 (4), 409-417, 2002
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
- 1390282681468772096
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- NII Article ID
- 130007342491
- 10008832856
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- NII Book ID
- AN00187860
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- ISSN
- 18806880
- 24337501
- 00214876
- http://id.crossref.org/issn/00214876
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- NDL BIB ID
- 6151740
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed