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

IF 4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Metals and Materials International Pub Date : 2025-01-20 DOI:10.1007/s12540-024-01885-5

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

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Abstract

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

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不同处理方式下钙添加量对Al-3% Mg-0.8% Mn合金组织和力学性能的影响

研究了Al-Mg-Ca-Mn系新合金Al3Mg2Ca0.8Mn的显微组织、相组成、轧制加工性能和力学性能的变化。铸态组织的研究结果表明，除了铝基体外，还存在两种共晶金属间相al4ca和Al6（Mn,Fe）。铝基体中镁和锰含量显著增加，而钙溶解度保持在0.1 wt%以下。热分析结果与理论预测一致。在440°C\6 h\水+ 550°C\3 h\空气（SSHT）热处理后，Al4Ca金属间化合物球化，显微组织明显改善。SSHT后也形成针状微米级的Al10CaMn2颗粒，而不是Al6（Mn,Fe）。通过两条路径对合金的轧制性能进行了测试。与经过SSHT（路径2）处理的样品相比，未经事先均匀化（路径1）轧制的样品表现出更好的力学性能。路径1的抗再结晶性能也较好。这种增强是由于纳米级的Al6（Mn,Fe）析出，而SSHT后样品中不存在这种析出。总的来说，两种轧制方法都突出了钙合金的优点，晶粒尺寸显著增加60%，导致无钙合金的强度下降30% （YS为135/143 MPa，而110 MPa）。图形抽象

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.