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Transmission electron microscopy and differential scanning calorimetry studies on the precipitation sequence in an Al-Mg-Si alloy: AA6022

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Abstract

The precipitate sequence in a 6022 aluminum alloy was investigated by means of differential scanning calorimetry (DSC), transmission electron microscopy, and Vickers hardness measurements. The solution-treated samples were quenched and then immediately subjected to DSC and isothermal aging experiments. It was observed that in the early stages of aging there are some unknown small precipitates that form prior to the formation of ß? precipitates. Studies on isothermally aged and DSC heated samples suggest that some of the ß? needles transform during growth to lath-shaped precipitates. An alternative precipitation sequence for AA6022 is proposed.

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Authors and Affiliations

  1. School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington, 99164-2920, USA

    Reza S. Yassar & David P. Field

  2. Alcoa Technical Center, Alcoa Center, Pennsylvania, 15069, USA

    Hasso Weiland

Authors
  1. Reza S. Yassar
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  2. David P. Field
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  3. Hasso Weiland
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Correspondence to Reza S. Yassar.

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Yassar, R.S., Field, D.P. & Weiland, H. Transmission electron microscopy and differential scanning calorimetry studies on the precipitation sequence in an Al-Mg-Si alloy: AA6022. Journal of Materials Research 20, 2705–2711 (2005). https://doi.org/10.1557/JMR.2005.0330

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  • DOI: https://doi.org/10.1557/JMR.2005.0330

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