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The dendrite arm spacings of aluminum-copper alloys solidified under steady-state conditions

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Abstract

Aluminum-copper alloys of different composition have been solidified under steady-state conditions with known growth velocities and temperature gradients. Specimens were quenched during solidification to reveal the dendrite growth morphology and to allow the solute content at dendrite tips to be analyzed. Primary and secondary arm spacings have been measured as a function of the distanced behind the growing dendrite tips, the tip velocityR the temperature gradient in the liquid Gl and the solute content. The primary arm spacing λ1 is described for each alloy by the empirical relation: λ1 = kGL -aR-b wherek is a constant, and both a and b are close to 1/2; λ1 is also found to increase with solute content. The secondary arm spacing λ2 for each alloy increases with timeθ spent in the liquid/solid region, being directly proportional to θn where n is close to 1/3; increasing solute content however causes a reduction in λ2. It is suggested that the observed “coarsening” of the secondary arms is primarily a coalescence phenomenon.

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Authors and Affiliations

  1. Department of Metallurgy, Massachusetts Institute of Technology, England

    K. P. Young (Research Associate)

  2. Department of Metallurgy, Sheffield University, England

    D. H. Kerkwood (Lecturer)

Authors
  1. K. P. Young
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  2. D. H. Kerkwood
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Formerly at Sheffield University

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Young, K.P., Kerkwood, D.H. The dendrite arm spacings of aluminum-copper alloys solidified under steady-state conditions. Metall Trans A 6, 197–205 (1975). https://doi.org/10.1007/BF02673688

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