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Displacement reactions during mechanical alloying

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Abstract

The occurrence of simple solid-state displacement reactions during mechanical alloying has been investigated. The reduction of cupric oxide to pure copper metal by a variety of metallic reducing agents was studied, and the powders were examined by X-ray diffractometry and electron microscopy. When milled with a liquid process control agent, the reaction progressed gradually with time, whereas an unstable combustion reaction occurred when no such control agent was employed. A minimum adiabatic temperature of 1300 K is necessary for combustion to occur in these systems. The reaction enthalpy is an important factor in determining the precombustion period. The as-milled powders consisted of finely divided, nanometer-sized crystallites with an extremely high defect density. It is proposed that the increased reactivity of the system arises through the unique conditions prevailing during mechanical alloying.

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Authors and Affiliations

  1. Mechanical Engineering Department, University of Western Australia, 6009, Nedlands, Western Australia, Australia

    G. B. Schaffer (Lecturer) & P. G. McCormick (Associate Professor)

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  1. G. B. Schaffer
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  2. P. G. McCormick
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Formerly University Research Fellow

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Schaffer, G.B., McCormick, P.G. Displacement reactions during mechanical alloying. Metall Trans A 21, 2789–2794 (1990). https://doi.org/10.1007/BF02646073

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  • DOI: https://doi.org/10.1007/BF02646073

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