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Type: Artigo
Title: Morphology of intermetallics tailoring tensile properties and quality index of a eutectic Al-Si-Ni alloy
Author: Kakitani, Rafael
Garcia, Amauri
Cheung, Noé
Abstract: Herein, the eutectic Al–11 wt% Si–5 wt% Ni alloy, directionally solidified under transient heat‐flow conditions, is comparatively evaluated in relation to the binary Al–11 wt% Si and Al–5 wt% Ni alloys. Correlations are developed relating the solidification cooling rate, primary dendritic spacing, and tensile properties. The Al3Ni intermetallic compounds (IMCs) are shown to have a morphological transition from plate‐like to fishbone for Ṫ < 6 °C s−1. Experimental Hall–Petch‐type equations are proposed relating yield and ultimate tensile strengths to λ1. Moreover, both the quality index (QI), which depends on the determined tensile properties, and the fishbone/plate‐like ratio (FPR) of the Al3Ni IMCs are plotted simultaneously as a function of Ṫ. This procedure permits three different regions to be determined relating solidification operational parameters to microstructural features and a quality parameter, according to the morphologies of the Al3Ni IMCs, namely (I) plate‐like, (II) fishbone rising, and (III) fishbone prevalence
Subject: Solidificação
Ligas (Metalurgia)
Country: Alemanha
Editor: John Wiley & Sons
Rights: Fechado
Identifier DOI: 10.1002/adem.202000503
Date Issue: 2020
Appears in Collections:FEM - Artigos e Outros Documentos

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