Simulation of solidification behavior in spray deposited preform: II. Calculation Results for Al-Cu Alloy

According to the solidification model in the spray formed preform proposed in the first part of this study, the solidification behavior of typical Al-Cu alloy is calculated and discussed. The result shows that processing parameters such as deposition rate and spray temperature at deposition, and material thermal physical properties such as surface heat transfer coefficient have apparent effects on solidification process in preform. Under the same deposition thermodynamic conditions such as the thermodynamic state of the spray cone just before depositing on the surface of the preform, temperature of deposition surface will vary significantly as the processing parameters and material thermal physical properties change. Therefore the temperature of deposition surface should be taken as the major factor for spray processing control, and the formerly proposed principle for spray forming processing control should be reconsidered.