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Microstructural Transition from Eutectic to Dendritic Structures and Its Effect on Mechanical Properties During Directional Solidification of Al–Si–Co Alloy.

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Title: Microstructural Transition from Eutectic to Dendritic Structures and Its Effect on Mechanical Properties During Directional Solidification of Al–Si–Co Alloy.
Authors: Üstün, Erkan1 (AUTHOR) erkanustun_07@hotmail.com, Çadırlı, Emin2 (AUTHOR)
Source: International Journal of Metalcasting. May2026, Vol. 20 Issue 3, p1851-1865. 15p.
Subjects: Directional solidification, Mechanical behavior of materials, Ternary alloys, Eutectic structure, Dendritic crystals, Aluminum-silicon alloys, Phase transitions, Solidification
Abstract: In this study, the Al–12Si–1Co (at%) ternary alloy was directionally solidified using a Bridgman-type growth apparatus under a constant temperature gradient (G=7.42 K/mm) over a wide range of growth rates (V=8.3–498.0 μm/s). At a growth rate of 166.0 μm/s, transitions from eutectic to dendritic structures were observed in the microstructure. In both transverse and longitudinal specimens of the directionally solidified alloy, flake spacing at low growth rates (8.3–166.0 μm/s) and dendritic arm spacing (λ) at high growth rates (498.0 μm/s), along with microhardness (HV), tensile yield strength, ultimate tensile strength, and compressive yield strength (σTYS, σUTS, σCYS), were measured. The dependence of flake and dendritic arm spacing, microhardness, and tensile and compressive strengths on the growth rate (V) was also determined through statistical analysis. According to the results, it was found that as the V value increased, HV, σTYS, σUTS, and σCYS values also increased. The findings of this study were compared with previous similar experimental results obtained for binary and ternary alloys. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:In this study, the Al–12Si–1Co (at%) ternary alloy was directionally solidified using a Bridgman-type growth apparatus under a constant temperature gradient (G=7.42 K/mm) over a wide range of growth rates (V=8.3–498.0 μm/s). At a growth rate of 166.0 μm/s, transitions from eutectic to dendritic structures were observed in the microstructure. In both transverse and longitudinal specimens of the directionally solidified alloy, flake spacing at low growth rates (8.3–166.0 μm/s) and dendritic arm spacing (λ) at high growth rates (498.0 μm/s), along with microhardness (HV), tensile yield strength, ultimate tensile strength, and compressive yield strength (σTYS, σUTS, σCYS), were measured. The dependence of flake and dendritic arm spacing, microhardness, and tensile and compressive strengths on the growth rate (V) was also determined through statistical analysis. According to the results, it was found that as the V value increased, HV, σTYS, σUTS, and σCYS values also increased. The findings of this study were compared with previous similar experimental results obtained for binary and ternary alloys. [ABSTRACT FROM AUTHOR]
ISSN:19395981
DOI:10.1007/s40962-025-01701-9