Densification and Shape Distortion of the Al-Cu-Mg Pre-alloyed Powder Compact in Supersolidus Liquid Phase Sintering Process

In this research, densification and shape distortion of the Al-Cu-Mg (Al۲۰۲۴) pre-alloyed powder compact in the supersolidus liquid phase sintering process (SLPS) were investigated. The effect of Sn on the sintering process was also studied. The powders were compacted at pressures ranging from ۱۰۰ to ۵۰۰ MPa in a cylindrical die. The sintering process was performed in a dry N۲ atmosphere at various temperatures (۵۸۰-۶۲۰ ºC) for ۳۰ min at a heating rate of ۱۰ ºCmin-۱. Results showed that the onset of densification process was observed at ۶۰۰ºC and onset of distortion was occurred at ۶۱۰ºC. Addition of ۰.۱ wt. %Sn to the alloy has increased the distortion of the samples produced from Al-Cu-Mg pre-alloyed powder, but their densification has been improved. The compact pressure of ۲۰۰MPa caused the complete densification at the optimum sintering temperature and at the compact pressures greater than ۲۰۰MPa; the sintered density was independent of green density.

Keywords:

Al-Cu-Mg powder , ۲۰۲۴ Al alloy , SLPS , liquid phase sintering , distortion , densification.