Investigations of High-Strength Mg–Al–Ca–Mn Alloys with a Broad Range of Ca+Al Contents

Gneiger, Stefan; Papenberg, Nikolaus; Arnoldt, Aurel; Schlögl, Carina M.; Fehlbier, Martin

doi:10.3390/ma14185439

Cited by 12 publications

(3 citation statements)

References 36 publications

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“…Firstly, over 1000 raw datapoints of the composition‐process‐property of Mg alloys were collected from experimental data of published literatures and conducted by our research group. Then, 370 datapoints of rare‐earth‐free extruded Mg alloys [12–50] were selected for training the ML model. The different ML regression algorithms were used with the features of alloying composition and extrusion processes parameter and the targets of mechanical properties.…”

Section: Accelerated Design Scheme Based On Machine Learningmentioning

confidence: 99%

Optimal design of high‐performance rare‐earth‐free wrought magnesium alloys using machine learning

Li,

Dong,

Jin

et al. 2024

Materials Genome Engineering Advances

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In this study, a small dataset of 370 datapoints of Mg alloys are selected for machine learning (ML), in which each datapoint includes five rare‐earth‐free alloying elements (Ca, Zn, Al, Mn and Sn), three extrusion parameters (extrusion speed, temperature and ratio), and three mechanical properties (yield strength [YS], ultimate tensile strength [UTS] and elongation [EL]). The ML algorithms, including support vector machine regression (SVR), artificial neural network, and other three methods, are employed, and the SVR has the best performance in predicting mechanical properties based on the components, and process parameters, with the mean absolute percentage error of YS, UTS, and EL being 6.34%, 4.19%, and 13.64% in the test set, respectively. The SVR model combined with multi‐objective genetic algorithm are successfully used to optimize mechanical properties of four extruded alloys from Mg‐Ca, Mg‐Ca‐Zn, Mg‐Ca‐Mn‐Sn, and Mg‐Ca‐Al‐Zn‐Mn series alloys, respectively, and the corresponding experimental results are in good agreement with the designed ones. Furthermore, new composition schemes are proposed from a wider range of elements and processing features to match the objectives of high‐strength, strength–ductility balanced, and high‐ductility Mg alloys, and the four‐, five‐ and six‐element alloying schemes are provided for the candidates of new‐generation wrought Mg alloys.

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Section: Accelerated Design Scheme Based On Machine Learningmentioning

confidence: 99%

Optimal design of high‐performance rare‐earth‐free wrought magnesium alloys using machine learning

Li,

Dong,

Jin

et al. 2024

Materials Genome Engineering Advances

View full text Add to dashboard Cite

show abstract

“…Moreover, Al-Mn dispersoids inhibit grain growth during processing and solution heat treatment by Zener drag [5,27]. Overall, the Mg-Al-Ca-Mn alloy has been shown to exhibit high strength due to the broad range of Ca and Al in the system [28].…”

Section: Introductionmentioning

confidence: 99%

Influence of Processing Temperature and Strain Rate on the Microstructure and Mechanical Properties of Magnesium Alloys Processed by Single-Pass Differential Speed Rolling

Hale,

Xu,

Fialkova

et al. 2024

Crystals

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Magnesium-based alloys show significant promise for widespread applications owing to their lightweight nature and improved mechanical properties achieved through grain refinement via hot rolling. This investigation focuses on Mg-xAl-yCa-zMn (AXM alloys), pre-heated to temperatures of 350, 400, and 450 °C and processed via both single-pass differential speed rolling (DSR) and conventional rolling (CR). The key findings reveal the interplay between processing temperature, strain rate during single-pass rolling, and an innovative approach for incorporating varying amounts of Ca, influencing grain size, quantity of dynamic recrystallization (DRX) grains, and overall mechanical properties, including strength and ductility. A noteworthy observation is the positive correlation between an increase in the total reduction during hot rolling and a higher fraction of DRXed grains. This leads to a significant reduction in average grain size, diminishing from 60.3 ± 54.3 μm to 19.5 ± 14.2 μm at 40%, nearly a third the size of T4 grains (the initial homogenized microstructure of the AXM alloys). The resultant material strength experiences a doubling from an average of 125 ± 10.2 MPa (T4) to 260 ± 25.8 MPa (DSR rolled at 40%) for the AXM alloys with potential improvement in the ductility depending on rolling speed conditions. This study also aims to analyze the combination of rolling temperature, rolling speed, thickness reduction, speed difference and Ca content implemented across a wide range of temperatures and strain rates to provide a holistic approach to the processing parameters affecting the microstructure and mechanical properties of AXM alloys. Furthermore, this study provides a deeper understanding of DRX mechanisms, including continuous DRX (CDRX), discontinuous DRX (DDRX), and twinning induced DRX (TDRX), while each of these mechanisms plays a distinct role in the overall enhancement of formability and performance of magnesium alloys.

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“…Recently, extruded Mg-Al-Ca alloys were extensively researched, as they offer a unique combination of properties, e.g., high mechanical strength [2][3][4]. Calcium (Ca) as an alloying element in Mg-Al reduces the texture intensity, enables age hardening, and increases oxidation as well as flammability resistance [5,6]. While the influence of elements such as manganese (Mn) and impurities like nickel (Ni) and iron (Fe) on corrosion behavior is well investigated in general [7], interactions between composition, microstructure, and corrosion resistance in Mg-Al-Ca alloys are not yet fully understood.…”

Section: Introductionmentioning

confidence: 99%

Investigations of Electrochemical Characteristics of Mg-Al-Ca Alloys

Sovík,

Hadzima,

Papenberg

et al. 2023

Crystals

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Magnesium alloys possess a high strength-to-density ratio, thereby increasingly being utilized as lightweight structural materials in a range of industrial applications. Nevertheless, to compete with established materials like aluminum alloys, it is essential to understand the corrosion behavior of Mg and its alloys, as their high reactivity hampers industrial application. The addition of Ca to wrought Mg-Al alloys has gained attention for its ability to improve mechanical properties while also enhancing processing behavior. However, the wide range of alloy compositions within the class of Mg-Al-Ca alloys results in a variety of different corrosion properties. Consequently, this study contributes by investigating the corrosion behavior of two Mg-Al-Ca alloys, highlighting the influence of chemical composition and microstructure.

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Investigations of High-Strength Mg–Al–Ca–Mn Alloys with a Broad Range of Ca+Al Contents

Cited by 12 publications

References 36 publications

Optimal design of high‐performance rare‐earth‐free wrought magnesium alloys using machine learning

Optimal design of high‐performance rare‐earth‐free wrought magnesium alloys using machine learning

Influence of Processing Temperature and Strain Rate on the Microstructure and Mechanical Properties of Magnesium Alloys Processed by Single-Pass Differential Speed Rolling

Investigations of Electrochemical Characteristics of Mg-Al-Ca Alloys

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