Morphological transition in the cellular structure of single crystals of nickel-tungsten alloys near the congruent melting point

Morphological transition in the cellular structure of single crystals of nickel-tungsten alloys near the congruent melting point

The structure and microhardness of single crystals of nickel-tungsten alloys containing 25-36 wt % W are investigated. The temperature gradient at the crystallization front and the velocity of the crystallization front are the variable parameters of directional crystallization. It is found that, whe...

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Bibliographic Details
Published in:Crystallography reports Vol. 50; no. S1; pp. S130 - S135
Main Authors: Azhazha, V. M., Ladygin, A. N., Sverdlov, V. Ja, Zhemanyuk, P. D., Klochikhin, V. V.
Format: Journal Article
Language:English
Published: United States 01-01-2005
Subjects:
BINARY ALLOY SYSTEMS
CRYSTAL GROWTH
CRYSTAL STRUCTURE
CRYSTALLIZATION
IMPURITIES
MATERIALS SCIENCE
MELTING POINTS
MICROHARDNESS
MICROSTRUCTURE
MONOCRYSTALS
MORPHOLOGY
NICKEL ALLOYS
TEMPERATURE GRADIENTS
TUNGSTEN ALLOYS
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Summary:The structure and microhardness of single crystals of nickel-tungsten alloys containing 25-36 wt % W are investigated. The temperature gradient at the crystallization front and the velocity of the crystallization front are the variable parameters of directional crystallization. It is found that, when the velocity of the crystallization front is 4 mm/min, the morphology of the cellular structure of the single crystals grown from nickel-tungsten alloys changes from square cells to hexagonal cells at a tungsten content of greater than or equal to 31 wt %. As the velocity of the crystallization front increases to 10 mm/min, no morphological transition occurs. It is shown that impurities play an important role in the formation of a cellular structure with cells of different types.
ISSN:1063-7745
1562-689X
DOI:10.1134/1.2133988