EFFECT OF SUPERSOLIDUS LIQUID PHASE SINTERING ON THE MICROSTRUCTURE AND DENSIFICATION OF THE Al-Cu-Mg PREALLOYED POWDER

Abstract: The supersolidus liquid phase sintering characteristics of commercial ۲۰۲۴ pre-alloyed powder was studied at different sintering conditions. Pre-alloyed ۲۰۲۴ aluminum alloy powder was produced via air atomizing process with particle size of less than ۱۰۰ µm. The solidus and liquidus temperatures of the produced alloy were determined using differential thermal analysis (DTA). The sintering process was performed at various temperatures ranging from the solidus to liquidus temperatures in dry N۲ gas atmosphere for ۳۰ min in a tube furnace. The maximum density of the ۲۰۲۴ aluminum alloy was obtained at ۶۱۰ºC which yields parts with a relative density of ۹۸.۸% of the theoretical density. The density of the sintered samples increased to the maximum ۹۹.۳% of the theoretical density with the addition of ۰.۱ wt. %Sn powder to the ۲۰۲۴ pre-alloyed powder. The maximum density was obtained at ۱۵% liquid volume fraction for both powder mixtures.

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Keyword: Al-Cu-Mg Aluminum Alloy ، Supersolidus Liquid Phase sintering ، Fractional grain boundary coverage ، Densification