Processes of Obtaining Granular Materials from Al–Zn–Mg–Cu Aluminum Alloys Using Ultra-Fast Granular Crystallization

This paper presents the results of studies into the process of obtaining granular materials from high-strength aluminum alloys of the Al–Zn–Mg–Cu system by melt centrifugation with ultra-high granular cooling rates. The concept of a “vapor jacket” is introduced to describe a vapor layer appearing be...

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Bibliographic Details
Published in:Metallurgist (New York) 2022-07, Vol.66 (3-4), p.276-289
Main Author: Zharov, M. V.
Format: Article
Language:English
Subjects:
Aluminum
Aluminum alloys
Aluminum base alloys
Characterization and Evaluation of Materials
Chemistry and Materials Science
Cooling
Cooling rate
Copper
Crystallization
Electric properties
Granular materials
High strength alloys
Magnesium
Materials Science
Metallic Materials
Specialty metals industry
Thermal conductivity
Thermal properties
Vapors
Zinc
Zinc compounds
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Summary:This paper presents the results of studies into the process of obtaining granular materials from high-strength aluminum alloys of the Al–Zn–Mg–Cu system by melt centrifugation with ultra-high granular cooling rates. The concept of a “vapor jacket” is introduced to describe a vapor layer appearing between the granular body and the cooling fluid, which impedes heat removal and represents an obstacle for an increase in the crystallization rate due to a smaller thermal conductivity of water vapors. A technology for increasing the granular crystallization rate by constant removal of a vapor layer is proposed. It was established that an increase in the rate of heat removal from crystallized granules and, consequently, in the crystallization rate leads to an increase in the strength characteristics of granular Al–Zn–Mg–Cu aluminum alloys. The described method, which is based on the removal of a vapor layer formed around a granule, seems to be the only feasible solution to increasing further the cooling rate and, consequently, the crystallization rate.
ISSN:0026-0894
1573-8892
DOI:10.1007/s11015-022-01327-w