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Metastable phases in an Al-Mg-Si alloy containing copper

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Abstract

The Q′ phase in an Al-1.0 mass pct Mg2Si-0.5 mass pct Cu alloy at a peak-aged condition of 523 K was observed by a high-resolution transmission electron microscope (HRTEM), in order to identify its structure and chemical composition, and was compared with the type-C precipitate in an Al-1.0 mass pct Mg2Si-0.4 mass pct Si alloy (the excess-Si alloy). The Q′ phase has similar features to the type-C precipitate, according to results of electron diffraction patterns and images taken by the HRTEM, that is, they have similar hexagonal crystal lattices (a=1.04 nm and c=0.405 nm) to each other. The type-C precipitate in the excess-Si alloy was the ternary Al-Mg-Si phase, and the Q′ phase was the quaternary Al-Mg-Si-Cu phase in the Al-Mg-Si-Cu alloy, as determined by energy-dispersive X-ray spectroscopic (EDS) analysis.

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Authors and Affiliations

  1. the Faculty of Engineering, Toyama University, 930-8555, Toyama, Japan

    Kenji Matsuda (Associate Professor) & Susumu Ikeno (Professor)

  2. the Research Institute of Technology, Toyama Prefectural University, 939-0398, Toyama, Japan

    Yasuhiro Uetani (Associate Professor)

  3. the Faculty of Engineering, Tokyo Institute of Technology, 152-8552, Tokyo, Japan

    Tatsuo Sato (Professor)

Authors
  1. Kenji Matsuda
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  2. Susumu Ikeno
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  3. Yasuhiro Uetani
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  4. Tatsuo Sato
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Matsuda, K., Ikeno, S., Uetani, Y. et al. Metastable phases in an Al-Mg-Si alloy containing copper. Metall Mater Trans A 32, 1293–1299 (2001). https://doi.org/10.1007/s11661-001-0219-2

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  • DOI: https://doi.org/10.1007/s11661-001-0219-2

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