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Natural Aging in Friction Stir Welded 7136-T76 Aluminum Alloy

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Friction Stir Welding and Processing VIII

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Abstract

The long term natural aging behavior of friction stir welded aluminum 7136-T76 extrusions was investigated. The microstructure and mechanical properties in the as-welded, three years naturally aged, and six years naturally aged conditions were studied. Hardness profiles of the as-welded condition displayed the characteristic W-shape, but the advancing side hardness was lower than that on the retreating side. With natural aging, hardness recovery occurred, but the position of the hardness minima, particularly on the advancing side, shifted away from the weld centerline. Numerical simulations demonstrated that the processing temperatures were greater on the advancing side such that equilibrium phase dissolution was greater in this location and occurred to a greater distance from the centerline than on the retreating side. The hardness behavior upon natural aging, therefore, correlated to the temperature profile developed during welding and the degree to which phase dissolution occurs in the regions adjacent to the stir zone.

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Author information

Authors and Affiliations

  1. Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, Kraków, Poland

    I. Kalemba & S. Dymek

  2. Department of Mechanical and Manufacturing Engineering, Miami University, Oxford, OH, USA

    C. Hamilton

Authors
  1. I. Kalemba
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  2. C. Hamilton
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  3. S. Dymek
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Editor information

Editors and Affiliations

  1. Department of Materials Science and Engineering, University of North Texas, USA

    Rajiv S. Mishra (Professor of Materials Science and Engineering) (Professor of Materials Science and Engineering)

  2. Structural Metals Department, Rockwell Scientific, USA

    Murray W. Mahoney (Prior, Manager/Senior Scientist, B.S., physical metallurgy, M.S., physical metallurgy) (Prior, Manager/Senior Scientist, B.S., physical metallurgy, M.S., physical metallurgy)

  3. University of California Berkeley, USA

    Murray W. Mahoney (Prior, Manager/Senior Scientist, B.S., physical metallurgy, M.S., physical metallurgy) (Prior, Manager/Senior Scientist, B.S., physical metallurgy, M.S., physical metallurgy)

  4. University of California Los Angeles, USA

    Murray W. Mahoney (Prior, Manager/Senior Scientist, B.S., physical metallurgy, M.S., physical metallurgy) (Prior, Manager/Senior Scientist, B.S., physical metallurgy, M.S., physical metallurgy)

  5. Department of Materials Processing, Tohoku University, Japan

    Yutaka Sato (Associate Professor) (Associate Professor)

  6. Pacific Northwest National Laboratory, USA

    Yuri Hovanski (Senior Research Engineer) (Senior Research Engineer)

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© 2015 TMS (The Minerals, Metals & Materials Society)

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Kalemba, I., Hamilton, C., Dymek, S. (2015). Natural Aging in Friction Stir Welded 7136-T76 Aluminum Alloy. In: Mishra, R.S., Mahoney, M.W., Sato, Y., Hovanski, Y. (eds) Friction Stir Welding and Processing VIII. Springer, Cham. https://doi.org/10.1007/978-3-319-48173-9_12

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