Single crystal seed alloy

An alloy composition suitable for use as a single crystal seed comprises nickel and, in the proportion of 5 to 50 weight %, a further metal selected from the Transition Series of elements in Period VI of the Periodic Table of Elements. The further metal may be tungsten or tantalum. The alloy composi...

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Bibliographische Detailangaben
Hauptverfasser:	ANTHONY DAVID HILL, DAVID ALAN FORD
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUSPOLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE APPARATUS THEREFOR CHEMISTRY CRYSTAL GROWTH METALLURGY PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE REFINING BY ZONE-MELTING OF MATERIAL SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE SINGLE-CRYSTAL-GROWTH UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL ORUNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL
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Beschreibung
Zusammenfassung:	An alloy composition suitable for use as a single crystal seed comprises nickel and, in the proportion of 5 to 50 weight %, a further metal selected from the Transition Series of elements in Period VI of the Periodic Table of Elements. The further metal may be tungsten or tantalum. The alloy composition contains no component which forms an oxide layer at elevated temperatures, and in particular contains no aluminium or titanium. The alloy composition is suitable for use as a seed alloy for the casting of single crystal components such as aerofoils for gas turbine engines.