Microstructure formation in binary Al-TM alloys under non-equilibrium solidification

The structure formation in hypereutectic Al-Sc and hyperperitectic Al-Zr, Al-Hf alloys with concentration of alloying element up to 1.3 at.% have been studied under conditions far from thermodynamical equilibrium depending on cooling rate and quenching temperature. The co-operative growth structures...

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Bibliographic Details
Published in:Journal of physics. Conference series 2009-01, Vol.144 (1), p.012096
Main Authors: Beresina, A L, Segida, E A, Kurdyumov, G V
Format: Article
Language:English
Subjects:
Alloying elements
Binary alloys
Cooling
Cooling rate
Heat treating
Overheating
Physics
Quenching
Solid solutions
Solidification
Thermodynamic equilibrium
Zirconium
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Summary:The structure formation in hypereutectic Al-Sc and hyperperitectic Al-Zr, Al-Hf alloys with concentration of alloying element up to 1.3 at.% have been studied under conditions far from thermodynamical equilibrium depending on cooling rate and quenching temperature. The co-operative growth structures are solidified with cooling rate of 102-103 K/s regardless of overheating and under cooling rate of 105-106 K/s at small overheating. The phase compound of these structures is α-solid solutions and phase with L12-ordered structure or two solid solutions with different concentrations of alloying element. The large overheating leads to formation of α-solid solution anomalously supersaturated under cooling rate of 105-106 K/s.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/144/1/012096