Cellular morphologies in a de-alloying residue

J. Szot School of Chemical Engineering and Industrial Chemistry, University of New South Wales, P.O. Box 1, Kensington, New South Wales, 2033, Australia; Glasstech Solar, Inc., 12441 West 49th Avenue, Wheat Ridge, Colorado, 80033, U.S.A.

D. J. Young School of Chemical Engineering and Industrial Chemistry, University of New South Wales, P.O. Box 1, Kensington, New South Wales, 2033, Australia

A. Bourdillon School of Materials Science and Engineering, University of New South Wales, P.O. Box 1, Kensington, New South Wales, 2033, Australia

K. E. Easterling School of Materials Science and Engineering, University of New South Wales, P.O. Box 1, Kensington, New South Wales, 2033, Australia

Abstract

A porous copper residue has been produced by the selective dissolution of aluminium from CuAl₂ into aqueous alkali solution at 1°C and 93°C. The residue was examined by replica and thin-foil microscopy and found to consist of cylindrical single-crystal copper rods or fibres of very uniform diameter. The fibres were curved but aligned with their average direction approximately parallel to the direction of the de-alloying reaction. The fibres produced by leaching at 93°C were spaced at approximately 110nm intervals, whereas those produced at 1°C were spaced at about 40 nm. All observations are shown to be in accord with a cellular phase transformation model for the de-alloying reaction.

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Cellular morphologies in a de-alloying residue

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Cellular morphologies in a de-alloying residue

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