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Segregation substructures in dilute Al–Cu alloys directionally solidified

✍ Scribed by Osvaldo Fornaro; Hugo A.Palacio; Heraldo Biloni

Book ID
104061195
Publisher
Elsevier Science
Year
2006
Tongue
English
Weight
746 KB
Volume
417
Category
Article
ISSN
0921-5093

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✦ Synopsis

Directional growth of dilute Al-0.2 wt.% Cu alloy was performed under conditions of controlled solidification. Proper metallographic analysis of the segregation patterns behind the solid-liquid (S-L) interface gives information about the effect of the local solidification conditions that determines the microsegregation. In order to explain the apparition of different solidification substructure as a function of the parameter (G L /VC 0 ) (G L , thermal gradient in the liquid in front of the S-L interface; V, solidification rate and C 0 , nominal composition of the alloy), as well as the small segregated instabilities detected at the cellular walls, a mechanism based on the morphological stability theory is proposed.

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