Solidification behavior and structure of Al-Cu alloy welds

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The microsegregation behavior of electron beam (EB) and gas tungsten arc (GTA) welds of Al-Cu alloys covering a range from 0.19 to 7.74 wt% Cu were characterized for dendrite core concentrations and fraction eutectic solidification. Although a single weld speed of 12.7 mm/sec was used, some differences were observed in the segregation behavior of the two weld types. The microsegregation behavior was also modeled using a finite differences technique considering dendrite tip and eutectic undercooling and solid state diffusion. Fairly good agreement was observed between measured and calculated segregation behavior although differences between the two weld types could not be ... continued below

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22 p.

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Brooks, J.A.; Li, M. & Yang, N.C.Y. September 1, 1997.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Livermore, CA (United States)
    Place of Publication: Livermore, California

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Description

The microsegregation behavior of electron beam (EB) and gas tungsten arc (GTA) welds of Al-Cu alloys covering a range from 0.19 to 7.74 wt% Cu were characterized for dendrite core concentrations and fraction eutectic solidification. Although a single weld speed of 12.7 mm/sec was used, some differences were observed in the segregation behavior of the two weld types. The microsegregation behavior was also modeled using a finite differences technique considering dendrite tip and eutectic undercooling and solid state diffusion. Fairly good agreement was observed between measured and calculated segregation behavior although differences between the two weld types could not be completely accounted for. The concept of dendrite tip undercooling was used to explain the formation of a single through thickness centerline grain in the higher alloy content GTA welds.

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22 p.

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OSTI as DE98052545

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  • 1997 conference on numerical analysis of weldability, Graz (Austria), 29 Sep - 1 Oct 1997

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  • Other: DE98052545
  • Report No.: SAND--98-8470C
  • Report No.: CONF-9709120--
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/654139 | External Link
  • Office of Scientific & Technical Information Report Number: 654139
  • Archival Resource Key: ark:/67531/metadc712075

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  • September 1, 1997

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  • Sept. 12, 2015, 6:31 a.m.

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  • April 12, 2016, 8:29 p.m.

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Brooks, J.A.; Li, M. & Yang, N.C.Y. Solidification behavior and structure of Al-Cu alloy welds, report, September 1, 1997; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc712075/: accessed November 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.