Abstract
Powders of three AlCrFe alloys containing 3.7–8.4wt.% chromium and 0.9–1.3wt.% iron were examined in the as-atomized condition. A transition in the solidification microstructure of the powders from a microcellular structure to a structure where Al 13Cr 2 intermetallics were present, occurred at a certain powder size which decreased for the more concentrated alloys. The minimum undercooling (MU) required to avoid intermetallic phase formation has been calculated for the aluminium-rich corner of the AlCrFe system. The MU maps can be used to aid selection of alloy compositions which produce powders with a cellular microstructure free from intermetallics.
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