Structural transformations of a gas-atomized Al62.5Cu25Fe12.5 alloy during detonation spraying, spark plasma sintering and hot pressing
In this work, we traced structural transformations of an Al62.5Cu25Fe12.5 alloy, in which a quasicrystalline icosahedral phase (i-phase) can be formed, upon spraying onto a substrate and consolidation from the powder into the bulk state. The Al62.5Cu25Fe12.5 powder was obtained by gas atomization an...
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Veröffentlicht in: | Science of sintering 2021, Vol.53 (3), p.379-386 |
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Sprache: | eng |
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Zusammenfassung: | In this work, we traced structural transformations of an Al62.5Cu25Fe12.5
alloy, in which a quasicrystalline icosahedral phase (i-phase) can be
formed, upon spraying onto a substrate and consolidation from the powder
into the bulk state. The Al62.5Cu25Fe12.5 powder was obtained by gas
atomization and consisted of i-phase and ?-phase AlCu(Fe). The powder was
detonation sprayed (DS) and consolidated by spark plasma sintering (SPS)/hot
pressing (HP). During DS, the particles experienced partial or complete
melting and rapid solidification, which resulted in the formation of
coatings of a complex structure. The composite regions containing i-phase
were inherited from the powder alloy. The fraction of the material that
experienced melting solidified as ?-phase AlFe(Cu) in the coating. It was
suggested that the difficulty of obtaining i-phase upon post-spray annealing
is related to aluminum depletion of the alloy during DS. During SPS and HP,
the elemental composition of the alloy was preserved, while the exposure to
an elevated temperature led to phase homogenization. SPS and HP conducted at
700?C resulted in full densification and the formation of a single-phase
quasicrystalline alloy. The sintered single-phase alloy showed a higher
microhardness in comparison with the DS coatings. |
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ISSN: | 0350-820X 1820-7413 |
DOI: | 10.2298/SOS2103379B |