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<p>This paper briefly overviews factors influencing hot tearing in hypoeutectic Al–Si–Cu cast alloys. Four base alloys, AlSi6Cu1, AlSi6Cu2, AlSi6Cu3, and AlSi6Cu4, were studied to analyze the impact of varying Cu content on hot tearing formation. The effect of Sr as a modifier on the hot tear formation was also examined. Cooling curve analysis (CCA) was employed to collect essential data, including dendrite coherency and rigidity temperatures and the corresponding solid fraction at each characteristic solidification temperature. A novel analytical model for predicting the crack susceptibility coefficient (CSC) is proposed. This model builds upon the previously established CSC model by Clyne and Davies, incorporating critical time/temperature periods between dendrite coherency and rigidity temperatures. The CSC calculated applying a novel analytical method based on temperature criteria has been additionally compared to an experiment-based hot cracking indexing (HCI) method using experiment data for the following three alloys: AlSi7Mg0.1Cu0.05, AlSi7Mg0.3Cu0.05, and AlSi7Mg0.6Cu0.05, taken from literature. The results indicate a good correlation between theoretical models and the experimental HCI method. The new model is particularly valuable for industrial applications as it provides flexibility by allowing both time-based and temperature-based calculations. It precisely captures the critical period during solidification where hot tearing is most likely to occur while accounting for varying cooling rates and their effect on time intervals between critical points. The model considers temperature-dependent behavior during the vulnerable period and incorporates the alloy composition’s influence on coherency and rigidity temperatures.</p>

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Comprehensive Modeling of Major (Cu) and Minor (Sr) Alloying Elements Impact on the Crack Susceptibility Coefficient of Cast Hypoeutectic AlSi6Cu(1–4 wt.%) Alloys

  • 期刊论文

  • 发表日期：

    2025年8月19日

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  • Mile B. Djurdjevic,
  • Srecko Manasijevic,
  • Aleksandra Patarić,
  • Srecko Stopic,
  • Marija Mihailović

摘要

This paper briefly overviews factors influencing hot tearing in hypoeutectic Al–Si–Cu cast alloys. Four base alloys, AlSi6Cu1, AlSi6Cu2, AlSi6Cu3, and AlSi6Cu4, were studied to analyze the impact of varying Cu content on hot tearing formation. The effect of Sr as a modifier on the hot tear formation was also examined. Cooling curve analysis (CCA) was employed to collect essential data, including dendrite coherency and rigidity temperatures and the corresponding solid fraction at each characteristic solidification temperature. A novel analytical model for predicting the crack susceptibility coefficient (CSC) is proposed. This model builds upon the previously established CSC model by Clyne and Davies, incorporating critical time/temperature periods between dendrite coherency and rigidity temperatures. The CSC calculated applying a novel analytical method based on temperature criteria has been additionally compared to an experiment-based hot cracking indexing (HCI) method using experiment data for the following three alloys: AlSi7Mg0.1Cu0.05, AlSi7Mg0.3Cu0.05, and AlSi7Mg0.6Cu0.05, taken from literature. The results indicate a good correlation between theoretical models and the experimental HCI method. The new model is particularly valuable for industrial applications as it provides flexibility by allowing both time-based and temperature-based calculations. It precisely captures the critical period during solidification where hot tearing is most likely to occur while accounting for varying cooling rates and their effect on time intervals between critical points. The model considers temperature-dependent behavior during the vulnerable period and incorporates the alloy composition’s influence on coherency and rigidity temperatures.