Activation of densification in the sintering of some powder metallurgy alloys View Full Text


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Article Info

DATE

1969-08

AUTHORS

V. I. Itin, K. V. Savitskii, Yu. I. Kozlov, A. D. Bratchikov

ABSTRACT

ConclusionsThe addition to a mixture of copper and aluminum powders of an element (such as silver) capable of forming binary eutectics with the mixture components activated densification and reduces specimen growth in the temperature range 480–800°C. The added element produces this effect by lowering the temperature of liquid-phase formation, widening the temperature range in which the liquid phase is present, and increasing the amount of the latter in compacts.The activated densification of a Cu-Al alloy at high temperatures (800–1000°C) is linked principally with the effect exerted by the silver addition on solid-phase sintering. The partial diffusion coefficients of silver and copper are unequal, and the preferential direction of the diffusion flux is from the addition to the matrix metal. This results in the formation of diffusion porosity in the surface layers of the silver particles, which activates shrinkage by facilitating the propagation of diffusional creep.With rise in silver concentration in a Cu-Al alloy, the extent of shrinkage increases and volume growth diminishes. Alloying with silver substantially accelerates the homogenization process of the alloy. More... »

PAGES

635-641

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00775423

DOI

http://dx.doi.org/10.1007/bf00775423

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1039443636


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