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An electron microscopy study of carbide precipitation in vanadium

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Abstract

The precipitation of carbon from supersaturated solid solution in vanadium has been investigated using transmission electron microscopy techniques on thin foils. High purity vanadium strip was doped to a carbon content of about 0.2 at. pct and rapidly quenched in high vacuum, followed by aging treatments for various times in the temperature range from 300° to 600°C. The strip was then thinned for transmission electron microscopy. The carbon is observed to precipitate initially as very finely dispersed carbides visible through structure factor contrast. With increasing aging the precipitate distribution coarsens, and the carbides appear as very thin coherent platelets on {310} planes, showing a pronounced displacement fringe contrast. The coherent precipitate appears to have a bcc structure closely related to that of the matrix. With further aging these platelets are observed to thicken and partially lose coherency, punching out prismatic dislocation loops and helices having axes in 〈111〉 directions. This semicoherent precipitate is found to be the hexagonal V2C phase described by other researchers, and its orientation relationship with the matrix may be expressed: (110)v‖(00.1)v2c, [•111]v‖[•110] v2C. The dislocation loops are a result of the specific volume difference between the V2C precipitation and the matrix, and have Burgers vector b = a/2〈111〉.

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Authors and Affiliations

  1. Argonne National Laboratory, Argonne, Ill.

    D. R. Diercks (Assistant Metallurgist)

  2. University of Illinois, Urbana-Champaign, Ill.

    C. A. Wert (Professor of Metallurgy and Member of the Materials Research Laboratory)

Authors
  1. D. R. Diercks
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  2. C. A. Wert
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Additional information

Formerly Research Assistant, Department of Metallurgy and Mining Engineering, University of Illinois at Urbana-Champaign, Urbana Ill.

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Diercks, D.R., Wert, C.A. An electron microscopy study of carbide precipitation in vanadium. Metall Trans 3, 1699–1708 (1972). https://doi.org/10.1007/BF02642549

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