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<p>The study examined the changes in microstructure, phase composition, processability during rolling, and mechanical properties of a new alloy from the Al–Mg-Ca-Mn system: Al3Mg2Ca0.8Mn. The findings regarding the as-cast structure revealed that, alongside the aluminum matrix, two eutectic intermetallic phases—Al<sub>4</sub>Ca and Al<sub>6</sub>(Mn,Fe)—were present. The aluminum matrix was notably enriched with magnesium and manganese, while calcium solubility remained below 0.1&#xa0;wt%. Thermal analysis results aligned well with theoretical predictions. Following heat treatment at 440&#xa0;°C\6&#xa0;h\water + 550&#xa0;°C\3&#xa0;h\air (SSHT), Al<sub>4</sub>Ca intermetallics were spheroidized, significantly improving the microstructure. Also after SSHT needle-like micron-sized Al<sub>10</sub>CaMn<sub>2</sub> particles formed instead of Al<sub>6</sub>(Mn,Fe). The rolling performance of the novel alloy was examined along two paths. Samples rolled without prior homogenization (path 1) exhibited better mechanical properties compared to those processed under SSHT (path 2). The resistance to recrystallization was also better for path 1. This enhancement was attributed to nanosized Al<sub>6</sub>(Mn,Fe) precipitates, absent in the samples after SSHT. Overall, both methods of rolling highlighted the benefits of calcium alloying, with a notable increase in grain size by 60%, leading to decreased strength by 30% in calcium-free alloys (YS was 135/143&#xa0;MPa <i>vs.</i> 110&#xa0;MPa).</p> Graphical abstract <p></p>

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Impact of Calcium Addition on Microstructural and Mechanical Properties of Al-3% Mg-0.8% Mn Alloy Under Different Treatment Paths

  • 期刊论文

  • 发表日期：

    2025年1月20日

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  • Vitali Doroshenko,
  • Andrey Aksenov,
  • Anastasiya Fortuna,
  • Leonid Gorlov,
  • Alexey S. Prosviryakov,
  • Stanislav Cherkasov,
  • Daria Strekalina

摘要

The study examined the changes in microstructure, phase composition, processability during rolling, and mechanical properties of a new alloy from the Al–Mg-Ca-Mn system: Al3Mg2Ca0.8Mn. The findings regarding the as-cast structure revealed that, alongside the aluminum matrix, two eutectic intermetallic phases—Al4Ca and Al6(Mn,Fe)—were present. The aluminum matrix was notably enriched with magnesium and manganese, while calcium solubility remained below 0.1 wt%. Thermal analysis results aligned well with theoretical predictions. Following heat treatment at 440 °C\6 h\water + 550 °C\3 h\air (SSHT), Al4Ca intermetallics were spheroidized, significantly improving the microstructure. Also after SSHT needle-like micron-sized Al10CaMn2 particles formed instead of Al6(Mn,Fe). The rolling performance of the novel alloy was examined along two paths. Samples rolled without prior homogenization (path 1) exhibited better mechanical properties compared to those processed under SSHT (path 2). The resistance to recrystallization was also better for path 1. This enhancement was attributed to nanosized Al6(Mn,Fe) precipitates, absent in the samples after SSHT. Overall, both methods of rolling highlighted the benefits of calcium alloying, with a notable increase in grain size by 60%, leading to decreased strength by 30% in calcium-free alloys (YS was 135/143 MPa vs. 110 MPa).

Graphical abstract