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<p>This study investigates the effect of magnesium (1–4&#xa0;wt.%) on the microstructure, rolling processability, and mechanical properties of a hypoeutectic Al-5%Ca alloy. Phase constituents were characterized experimentally in samples solidified at cooling rates of 10&#xa0;K/s and 0.1&#xa0;K/s using optical microscopy (OM), scanning electron microscopy (SEM), and X-ray diffraction (XRD). Thermodynamic calculations were performed with the Thermo-Calc software package (TTAL5 database). Magnesium was found to modify the morphology and size of the eutectic Al<sub>4</sub>Ca phase, promoting coarsening from submicron to micron dimensions. In alloys with 2–4% Mg solidified at 0.1&#xa0;K/s, a ternary Al<sub>2</sub>(Mg,Ca) phase was identified. Iron was consistently present as the Al<sub>10</sub>CaFe<sub>2</sub> compound. The production of high-quality hot-rolled sheets was demonstrated. After annealing, the Ca-containing alloys exhibited superior mechanical properties compared to the reference Al-1%Mg and Al-3%Mg alloys. For instance, the Al-5%Ca alloy showed ultimate strength/yield strength values of 165/91&#xa0;MPa versus 117/45&#xa0;MPa for Al-1%Mg and 184/66&#xa0;MPa for Al-3%Mg, while maintaining a high ductility of approximately 10%. These findings highlight the potential for developing novel, highly workable aluminum alloys with a high volume fraction of eutectic.</p>

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Effect of Mg on the Structure and Properties of a Hypoeutectic Al-5%Ca Wrought Alloy

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • Vitalii V. Doroshenko,
  • Ivan S. Solovev,
  • Alexandr N. Koshmin,
  • Stefaniya N. Kutepova,
  • Maria A. Pravkina

摘要

This study investigates the effect of magnesium (1–4 wt.%) on the microstructure, rolling processability, and mechanical properties of a hypoeutectic Al-5%Ca alloy. Phase constituents were characterized experimentally in samples solidified at cooling rates of 10 K/s and 0.1 K/s using optical microscopy (OM), scanning electron microscopy (SEM), and X-ray diffraction (XRD). Thermodynamic calculations were performed with the Thermo-Calc software package (TTAL5 database). Magnesium was found to modify the morphology and size of the eutectic Al4Ca phase, promoting coarsening from submicron to micron dimensions. In alloys with 2–4% Mg solidified at 0.1 K/s, a ternary Al2(Mg,Ca) phase was identified. Iron was consistently present as the Al10CaFe2 compound. The production of high-quality hot-rolled sheets was demonstrated. After annealing, the Ca-containing alloys exhibited superior mechanical properties compared to the reference Al-1%Mg and Al-3%Mg alloys. For instance, the Al-5%Ca alloy showed ultimate strength/yield strength values of 165/91 MPa versus 117/45 MPa for Al-1%Mg and 184/66 MPa for Al-3%Mg, while maintaining a high ductility of approximately 10%. These findings highlight the potential for developing novel, highly workable aluminum alloys with a high volume fraction of eutectic.