Formation of Ultra-Fine Grains in 5182 Aluminum Alloy Heavily Rolled at Warm Temperatures
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- Tsuji Nobuhiro
- Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University
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- Murakami Takeshi
- Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University
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- Saito Yoshihiro
- Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University
Bibliographic Information
- Other Title
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- 温間強圧延された5182アルミニウム合金における超微細結晶粒の形成
- オン カン キョウアツ ノバサレタ 5182 アルミニウム ゴウキン ニ オケル チョウビサイ ケッショウリュウ ノ ケイセイ
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Abstract
In order to obtain the ultra-fine grained bulk materials whose grain size is less than 1 μm, 5182 aluminum alloy was heavily rolled up to 98.3% at elevated temperatures (R.T.-573 K). The strength of the rolled specimens increased with increasing strain and decreasing rolling temperature, and the tensile strength of the specimen 98.3% rolled at R.T. reached to 540 MPa. The elongation of the 98.3% rolled specimens was 6 to 8% independent of the rolling temperature. No ultra-fine grains were observed in the as-rolled specimens. The specimens 98.3% rolled below 473 K showed complicated deformation microstructures and large local misorientations, while the 573 K rolled specimen showed an ordinary cell structure with small misorientation. Although ultra-fine grains did not form in the as-rolled specimens, 473 K annealing produced the ultra-fine grained structure in the specimens 98.3% rolled below 473 K. The mean grain size of the ultra-fine grains was about 600 nm, independent of the rolling temperature. Ultra-fine grains were not formed in the specimen rolled at 573 K. Even after annealing at 473 K for 18 ks, the ultra-fine grains were not coarsened and the sub-micrometer grain size remained. The formation of the ultra-fine grains can be explained by growth-inhibited recrystallization-nucleation, owing to both the homogeneous introduction of a number of potential nuclei with large local misorientations by high straining and the limited diffusion during low temperature annealing. Ultra-fine grained materials annealed at 473 K showed a tensile strength of 380 MPa and an elongation of 20%. The large strength of the ultra-fine grained material is due to grain refinement, because the Hall-Petch relation between the Vickers hardness and the grain size of the materials was observed.
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 63 (2), 243-251, 1999
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
- 1390001206490685184
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- NII Article ID
- 130007341305
- 10002548949
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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
- 4659692
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed