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Aging characteristics of electron beam and gas tungsten arc fusion zones of Al-Cu-Li alloy 2090

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Abstract

A transmission electron microscopy (TEM) investigation of the electron beam (EB) and gas tungsten arc (GTA) fusion zones of 2090 indicates that in both the as-welded and aged conditions, the EB and GTA fusion zones lack the volume fraction and the homogeneity of strengthening precipitates found in the base metal. In the underaged and peak-aged conditions, the δ′ phase is the primary strengthener, the volume fraction ofT 1 present being too low to be effective. TheT 1, precipitates are found either in the vicinity of other inclusions or at the dendrite boundaries. As the strength increases with postweld aging, the elongation decreases to 1 pct. The presence of the boundary phases and Cu- and Cl-containing inclusions at the boundaries leads to poor elongation. The joint efficiencies of the peak-aged EB and GTA weldments (EBWs and GTAWs, respectively) are 75 and 55 pct at 293 K and 75 and 50 pct at 77 K, respectively. Both EBWs and GTAWs have relatively low elongations.

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Authors and Affiliations

  1. Center for Advanced Materials, Lawrence Berkeley Laboratory, USA

    A. J. Sunwoo (Staff Scientist)

  2. Department of Materials Science and Engineering, University of California, 94552, Berkeley, CA

    J. W. Morris (Professor)

Authors
  1. A. J. Sunwoo
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  2. J. W. Morris
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Sunwoo, A.J., Morris, J.W. Aging characteristics of electron beam and gas tungsten arc fusion zones of Al-Cu-Li alloy 2090. Metall Trans A 22, 903–913 (1991). https://doi.org/10.1007/BF02659000

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  • DOI: https://doi.org/10.1007/BF02659000

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