Soviet Powder Metallurgy and Metal Ceramics

, Volume 12, Issue 6, pp 454–459 | Cite as

Reactive diffusion in a mixture of copper and aluminum powders

  • Yu. I. Kozlov
  • V. I. Itin
Theory and Technology of Sintering, Thermal, and Chemicothermal Treatment Processes


  1. 1.

    Reactive diffusion in a mixture of copper and aluminum powders and in a Cu-Al bimetal results in the formation of an intermediate layer composed of new phases arranged between the aluminum and the copper in the following order;θ (CuAl2), η2 (CuAl), and γ2 (Cu2Al).

  2. 2.

    The kinetics of growth of the individual phases and the layer as a whole in a mixture of copper and aluminum powders and a Cu-Albimetal obeys the parabolic law X2=K(t-t0). The latent period of a powder mixture is a very short, and the energy of activation for phase growth in it is approximately 1.5 times that in a bimetal. During the annealing of a powder mixture for long period of time, deviations from a parabolic law are observed, which are due to dissolution processes at the phase interfaces and the presence of only a limited amount of aluminum participating in diffusion.

  3. 3.

    The high reactivity of a powder mixture ensures that the rate ofθ phase growth at all temperatures is higher in such a mixture than in a bimetal. The rates of growth of the whole layer and the η22 phase layer in a powder mixture and a bimetal are approximately equal. The initial porosity of specimens and the presence of oxides on the surfaces of powder particles, which determine the area and degree of contact between dissimilar particles, exert a strong influence upon the rate of phase growth during reactive diffusion.



Copper Phase Growth Latent Period Powder Particle Powder Mixture 
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Copyright information

© Consultants Bureau 1973

Authors and Affiliations

  • Yu. I. Kozlov
    • 1
  • V. I. Itin
    • 1
  1. 1.V. D. Kuznetsov Siberian Physicotechnical InstituteUSSR

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