Gas Atomization of Amorphous Aluminum Powder: Part II. Experimental Investigation
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I.
INTRODUCTION
A two-part investigation is described in this article with the ultimate goal of establishing optimal processing parameters and providing insight into the relationship between thermal conditions and microstructural evolution during gas atomization (GA) of amorphous Al powder. In part I,[1] we described the numerical framework used to predict the thermal profile that is present during GA Al-based amorphous powder. More specifically, the numerical simulations were based on the assumption of Newtonian cooling with forced convection. The energy balance, gas dynamics, droplet dynamics, and heat transfer between gas and droplet were considered. To render the problem tractable, the phase transformation, crystal nucleation, and growth were ignored during Al droplet solidification. The modeling results were used to optimize process parameters for GA of Al-based amorphous powder, and these findings showed that the cooling rate of droplets increases with decreasing powder size and can reach in excess of 105 K/s for powder
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