Effects of Cu and Transition Metals on the Precipitation Behaviors of Metastable Phases at 523 K in Al-Mg-Si Alloys
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- Matsuda Kenji
- Faculty of Engineering, Toyama University
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- Taniguchi Shohei
- Faculty of Engineering, Toyama University
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- Kido Kosuke
- Faculty of Engineering, Toyama University
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- Uetani Yasuhiro
- Toyama Prefectural University, Kosugi
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- Ikeno Susumu
- Faculty of Engineering, Toyama University
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Abstract
Morphology and crystal lattice of precipitates formed in the 6000 series Al–Mg–Si alloys containing Cu and transition metals of Cr and Fe (TM) after aging at 523 K were investigated by high-resolution transmission microscopy (HRTEM). The precipitates in the Cu-bearing alloys are more finely and densely distributed than those in the Cu-free alloys, whereas those in the TM-bearing alloys were coarser and formed inhomogeneously at the interfaces between the dispersoids and the matrix. Three kinds of metastable phases were detected by HRTEM as follows: β′-phase in the balanced alloy, the TYPE-B precipitate in the excess-Si alloy, and Q′-phase in the Cu-bearing alloys. No significant difference in between the precipitates in the TM-free alloys and in the TM-bearing alloys was observed. However, the Type-B precipitate in the excess-Si alloy was replaced with the β′-phase by the addition of TM . This suggests that the chemical composition of the excess-Si alloy changes to the balanced composition, because the excess Si in the matrix has been consumed by the formation of the AlSi(Fe, Cr) and AlSiFe dispersoids.
Journal
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- MATERIALS TRANSACTIONS
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MATERIALS TRANSACTIONS 43 (11), 2789-2795, 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
- 1390282679222350720
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- NII Article ID
- 130004451726
- 10012328050
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- NII Book ID
- AA1151294X
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- COI
- 1:CAS:528:DC%2BD3sXjtFCk
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- ISSN
- 13475320
- 13459678
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- NDL BIB ID
- 6367291
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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