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Type: Artigo
Title: Microstructure, phase morphology, eutectic coupled zone and hardness of Alsingle bondCo alloys
Author: Silva, Cássio A.P.
Kakitani, Rafael
Canté, Manuel V.
Brito, Crystopher
Garcia, Amauri
Spinelli, José E.
Cheung, Noé
Abstract: This study examines the roles played by crystal growth rates (V) and cooling rates () on the microstructural evolutions of hypoeutectic (0.7 wt% Co), eutectic (1.0 wt% Co) and hypereutectic (1.5 wt% Co) Alsingle bondCo alloys. For this, these alloys have been directionally solidified by using a transient heat flow setup. It is shown that the microstructures of the 0.7 and 1.0 Co alloys are formed by α-Al matrices. In these alloys, a morphological reverse transition from α-Al matrix dendrites to cells is observed while a α-Al/ Al9Co2 eutectic mixture is also contained. In the Al- 1.5 wt% Co alloy, the prevalence of eutectic features occurs. Experimental growth laws relating cellular, dendritic and eutectic spacings to V and are determined. Plots relating V and to the alloys Co contents are proposed. The latter allow the range of coupled growth during transient solidification of Alsingle bondCo alloys to be examined. The hypereutectic alloy (1.5 wt% Co) demonstrates increase of about 41% in hardness as compared to the other examined alloys
Subject: Solidificação
Country: Estados Unidos
Editor: Elsevier
Rights: Fechado
Identifier DOI: 10.1016/j.matchar.2020.110617
Date Issue: 2020
Appears in Collections:FEM - Artigos e Outros Documentos

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