Abstract
Morphological and microstructural characterization of Al95Fe2 Cr2 Ti1 powders produced by two different gas atomizers
Highlights
Processes as gas atomization, spray deposition, splat quenching, melt spinning and planar flow casting impose high cooling rates during solidification and depending on the attained undercooling level their products can consist of different microstructures [1]
These curves are important to evaluate the distribution within a collection of particles and as commonly observed in gas atomized powders [10,15], the powders produced in this work showed a wide particle size range
The diameter ratio d84,3/d50,3 is 1.69 for PH and 1.79 for PS. These results corroborates with the literature [5,6,7] and prove that PH powder, produced under higher gas pressure and gas-to-metal mass flow ratio (GMR) has a much smaller mean particle size than PS powder
Summary
Spray deposition, splat quenching, melt spinning and planar flow casting impose high cooling rates during solidification and depending on the attained undercooling level their products can consist of different microstructures [1]. In the gas atomization method, a liquid stream of a molten alloy is disintegrated by high velocity gas, giving rise to spherical particles less than 200 μm in diameter that solidify in a containerless way [2] This process applies cooling rates around 105K/s [3], which are three orders magnitude higher than the cooling rate of water-cooled copper moulds [4]. Different cooling rates can be achieved according to processing parameters as the gas-to-metal mass flow ratio (GMR), type and pressure of the atomization gas, atmosphere in the atomization chamber and superheat These parameters affect the particle size, morphology, satellite formation and surface texture of the powder particles [5]. Even though particles more or less identical in size and shape from the same powder can show quite different microstructures because of different local conditions [1] the high solidification rate provides a refined structure and a more homogeneous chemical composition in the material [4]
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