SOLIDIFICATION AND PRECIPITATION BEHAVIOUR IN THE AlSi9Cu3 ALLOY WITH VARIOUS Ce ADDITIONS

作者：Voncina Maja^*; Kores Stanislav; Mrvar Primoz; Medved Jozef

来源：Materiali in Tehnologije, 2011, 45(6): 549-554.

• AlSi9Cu3 alloy
• Ce addition
• reaction kinetics
• solidification and precipitation
• mechanical properties

The effect of Ce additions on the AlSi9Cu3 alloy was investigated using an equilibrium thermodynamic calculation, thermal analysis, differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). The purpose was to study the variations that occur during solidification and precipitation with different Ce additions, as well as theireffect on the mechanical properties.
The results show that Ce additions shift the temperature of the eutectic solidification (alpha(Al) + Al(2)Cu) and the solidus temperature to higher values. It was found that the precipitation reaction is more intense when the specimen is previously cooled with a higher cooling rate. Moreover, when the fraction of the precipitates regarding the temperature at different cooling rates was taken into account, it was found that the precipitation is faster when Ce is added and also when the specimen was cooled faster. Ce also changed the morphology of the eutectic Al(2)Cu phase. Furthermore, the Ce phase was detected, indicating the Al-Ce-Cu-Si (Al(9)Ce(2)Cu(5)Si(3)) phase. The mechanical properties, such as hardness and tensile strength, increase with larger Ce additions.

• 出版日期2011-12