Conclusions
Formation of intermetallics with heating of compacts is accompanied by an exothermic effect as a result of which the temeprature for eutectic melting of a specimen (548°C) is achieved sooner than in the surrounding volume. The magnitude of the corresponding temperature drop depends on copper content and it is 5°C for Al-4.4% Cu, and for Al-50% Cu it is 23°C. Introduction of 0.5% magnesium into Al-4.4% Cu alloy reduced the temperature for melt formation as a result of appearance of a more readily melting ternary eutectic.
Growth of Al-Cu and Al-Cu-Mg compacts during sintering in the solid solution region of the composition diagram is caused by diffusion impregnation. With sintering in the liquid-solid region of the diagram apart from diffusion impregnation compact growth is affected by spreading of melt over the surface and grain boundaries of aluminum particles whose relative contribution to the overall compact growth is about 30%. Compacts of Al-4.4% Cu-0.5% Mg increase to a greater extent than for Al-4.4% Cu, which is caused by an increase in their liquid phase content.
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Translated from Poroshkovaya Metallurgiya, No. 2(350), pp. 13–17, February, 1992.
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Brodov, V.A., Zhil'tsov, A.V., Levinskii, Y.V. et al. Volumetric deformation of Al-4.4% Cu and Al-4.4% Cu-0.5% Mg compacts during sintering. Powder Metall Met Ceram 31, 108–111 (1992). https://doi.org/10.1007/BF00794042
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DOI: https://doi.org/10.1007/BF00794042