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<p>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 (σ<sub>TYS</sub>, σ<sub>UTS</sub>, σ<sub>CYS</sub>), 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, σ<sub>TYS</sub>, σ<sub>UTS</sub>, and σ<sub>CYS</sub> values also increased. The findings of this study were compared with previous similar experimental results obtained for binary and ternary alloys. </p>

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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

  • 期刊论文

  • 发表日期：

    2025年7月17日

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  • Erkan Üstün,
  • Emin Çadırlı

摘要

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.