Al8Mn5 Particle Settling and Interactions with Oxide Films in Liquid AZ91 Magnesium Alloys

Peng, L.; Zeng, Guang; Su, Te Cheng; Yasuda, Hideyuki; Nogita, Kazuhiro; Gourlay, C.M.

doi:10.1007/s11837-019-03471-2

Cited by 24 publications

(9 citation statements)

References 27 publications

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“…Most films were highly contorted (Fig. 4a, b), which was very similar to the ''snaky'' entrained oxides film found by previous researchers [30][31][32][33]. Upon investigation, it was found that the entrained films often wrapped at least one, although often several, collapsed bubbles as an integral part of the defects structure.…”

Section: Resultssupporting

confidence: 80%

Revealing the structure and evolution of entrained oxide film in Mg–Y alloy castings

Davies

Zhu

2021

J Mater Sci

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The structure and evolution of oxide film in Mg alloys have been a research objective for a long time but are still unclear up to now. In the present work, the structure of the entrained oxide film (which is also known as bifilm) in Mg–Y alloy castings protected by SF6/air cover gas was characterized. It was found that the entrained oxide film can be divided into two typical types: (1) single-layered F-rich films and (2) double-layered films with a F-rich inner layer and a F-poor outer layer. Based on the experimental phenomena and thermodynamic calculation, the evolution mechanism of the oxide film was also revealed. It was found that F element from the cover gas reacted with the melt firstly to form the initial F-rich single-layered film. Then, O and S were also involved in the reaction, transforming the initial film to be a (F, O, S)-rich single-layered film. Finally, when the F element was depleted, the newly formed layer on the existing oxide film is characteristically F-poor but (O, S)-enriched, leading to a double-layered oxide film. It was also found that the oxide film grew faster in SF6/air cover gas than in SF6/CO2 cover gas, resulting in a higher repeatability of mechanical properties of Mg–Y alloy castings.

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Section: Resultssupporting

confidence: 80%

Revealing the structure and evolution of entrained oxide film in Mg–Y alloy castings

Davies

Zhu

2021

J Mater Sci

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“…Furthermore, Fe-containing phases can be found, which are Al2Fe in AX22 and Al5Fe2 in AX32. The lower Fe-content in AX32 compared to AX22 can be due to settling of Mn-Fe particles in the melt before casting the material [33]. According to the calculation, the Fe-content in Al8Mn5 is negligible, while according to the literature, this phase plays an important role in binding Fe [34].…”

Section: Microstructurementioning

confidence: 88%

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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“…Synchrotron radiation X-rays with high brilliance and coherency have allowed us to observe solidification and related phenomena for various alloy systems over the last two decades. So far, observable alloy systems have been extended from low-melting-temperature alloys (Sn, Zn, Al, Mg alloys) [1][2][3][4][5][6][7][8] to high-melting-temperature alloys (copper, Ni-based superalloy, cast iron, carbon steel, stainless steel) [9][10][11][12]. Even a reactive Ti alloy has been achieved [13].…”

Section: Introductionmentioning

confidence: 99%

Reconstruction of dendritic growth by fast tomography and phase field filtering

Yasuda,

Nishiguchi,

Xue

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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Three dimensional models of dendritic structures during solidification are valuable for building physical models, validating simulated results, estimating some properties such as permeability in the mushy, simulating semisolid deformation and so on. Thus, it is of interest to observe microstructure evolution in situ. Time-resolved tomography combined with X-ray diffraction has allowed us to observe the evolution of dendritic structures and to measure crystallographic orientation in situ. Reconstruction still proves to be difficult for some alloy systems because of the tradeoff between time and spatial resolution. This paper demonstrates the reconstruction of dendritic structures for three different alloy systems (Al-10mass%Cu alloy with a diameter of 4 mm, CrMnFeCoNi alloy with 1 mm, and Zn-4mass%Al alloy with 0.7 mm). The observations were performed in a synchrotron radiation facility SPring-8. A filter using a phase field model was introduced to reconstruct the three-dimensional images. Parameters used in the filtering were consistently determined based on the raw reconstruction images. Evaluation of solid-liquid interface area and curvature was significantly improved by the filter. For the Al-Cu alloy, a three-dimensional model containing approximately 300 million voxels was obtained. For the CrMnFeCoNi alloys, the preferred growth direction <100> was confirmed by tomography and X-ray diffraction. For the Zn-Al alloy, the observed 14 growth directions were not simply defined by the crystallographic orientations, although the directions were consistent with the hexagonal symmetry. This study verifies that time resolved tomography, X-ray diffraction and the filter using a phase field model provide three dimensional models for light metal alloys with rather large diameters and 3d transition-metal alloys with rather large X-ray absorption coefficients. The models are expected to be used for further studies.

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Al8Mn5 Particle Settling and Interactions with Oxide Films in Liquid AZ91 Magnesium Alloys

Cited by 24 publications

References 27 publications

Revealing the structure and evolution of entrained oxide film in Mg–Y alloy castings

Revealing the structure and evolution of entrained oxide film in Mg–Y alloy castings

Investigations of Electrochemical Characteristics of Mg-Al-Ca Alloys

Reconstruction of dendritic growth by fast tomography and phase field filtering

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