Effects of different external fields on the microstructure and mechanical properties of novel Al Cu Li alloy during twin-roll casting

Li, Shiju; Jiang, Tao; Wang, Jin‐Yuan; Chen, Lizheng; Wei, Bowen; Li, Yang; Xu, Guangming; Wang, Zhaodong

doi:10.1016/j.msea.2019.04.079

Cited by 46 publications

(6 citation statements)

References 27 publications

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“…Within the limited heat treatment time, more solute elements will be redissolved from the grain boundary into the grain, improving the solid solubility and increasing the number of precipitates. Similar results are found in the study of Al-Cu-Li alloy prepared by TRC with electromagnetic oscillation field [29]. The solute element uniformity at grain boundary is improved by electromagnetic composite field, and the redissolution is more sufficient, thus increasing the density of precipitated phase.…”

Section: Precipitation and Mechanical Propertiessupporting

confidence: 86%

Improving element uniformity and mechanical properties of Al–Mg–Si alloy fabricated by twin roll casting with superheat melt treatment

Wei

Jiang

et al. 2022

Mater. Res. Express

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The effect of superheat melt treatment(SMT) on microstructure and properties of Al-Mg-Si alloy fabricated by twin roll casting(TRC) was analyzed using optical microscope, scanning electron microscopy, emission electron probe micro analyzer and transmission electron microscopy. SMT increased the subcooling degree of melt during TRC. The solidification microstructure with high dendrite density and small dendrite spacing was obtained. The second phase was evenly distributed between dendrites and the solute concentration gradient was decreased. Intergranular solute aggregation caused by Reynolds’ dilatancy in TRC slab was effectively suppressed. The homogeneous solute distribution of TRC slab with SMT can be realized by short-time homogenization heat treatment. The size of insoluble particles was greatly reduced. The complete decomposition of non-equilibrium eutectic phase increased the solute concentration in α-Al, which promoted the precipitation of precipitates during aging heat treatment. The tensile strength and yield strength of T6 slab were improved, while the uniform elongation are almost not decreased. The strength and uniform of slab in T4P state were both improved. The obtained results can help further shorten the production cycle of TRC slabs and improve mechanical properties.

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Section: Precipitation and Mechanical Propertiessupporting

confidence: 86%

Improving element uniformity and mechanical properties of Al–Mg–Si alloy fabricated by twin roll casting with superheat melt treatment

Wei

Jiang

et al. 2022

Mater. Res. Express

Self Cite

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“…During the conventional solidification process of Al–Mg–Si–La alloy, the solute elements can not sufficiently diffused, which leads to the concentration gradient and forms the dendritic segregation [27,30,31]. Finally, a large number of secondary phase formed at the α-Al grains boundaries in the Al–Mg–Si–La alloy.…”

Section: Resultsmentioning

confidence: 99%

Microstructure of Al–Mg–Si–La alloy under pulsed magnetic field treatment during solidification

Gong

Liu

et al. 2023

Materials Science and Technology

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The grains refinement and secondary phase modification mechanism of Al–Mg–Si–La alloy under pulsed magnetic field during solidification were studied in detail. With application of pulsed magnetic field, the microstructure of Al–Mg–Si–La alloy consists of fine and equiaxed grains. Meanwhile, the smaller size of Mg2Si homogeneously dispersed in α-Al grains, and the number of AlFeSi and LaAlSi phase obviously decreased compared with the ones without pulsed magnetic field treatment. The cluster nucleation at the liquid region during early solidification stage is dominant reason for grains refinement in Al–Mg–Si–La alloy under pulsed magnetic field. Theoretical calculation indicated that pulsed magnetic field provides maximum energy in the alloy melt at about 760°C, which decreased the critical radius and energy barrier for nucleation.

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“…The molten material is poured through a narrow gap onto water-cooled rolls during TRC, solidifying and undergoing a short hot forming. While TRC has been chiefly used in low-alloyed systems with a narrow solidification range, several TRC castings of Al-Li-based materials are promising [26,27]. Due to high solidification rates related to this method, much finer primary constituent particles are formed, and the segregation scales are much lower.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Phase Transformations in Al-Li-Cu-Mg-Zr-Sc Alloy Studied via In Situ Electron Microscopy

Králík,

Bajtošová,

Kihoulou

et al. 2024

Crystals

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A homogenization of billets from Al-Cu-Li-Mg-Sc-Zr alloys should be accomplished at high annealing temperatures exceeding 500 °C. This type of aluminum alloy is susceptible to the depletion of surface layers from Li. Therefore, choosing a suitable homogenization temperature and duration is a crucial step in assuring a homogeneous distribution of alloying elements and optimal exploitation of the potential of the alloy. In situ heating in an electron microscope was performed on a twin-roll-cast Al-Cu-Li-Mg-Sc-Zr alloy to understand the peculiarities of the homogenization process. Four types of primary phase particles rich in Cu, Li, Mg, and Fe were identified in the as-cast material. They appear as coarse particles at the boundaries of eutectic cells. Their partial dissolution occurs at temperatures above 450 °C. They are almost fully dissolved at 550 °C, except for complex phases containing Fe and Cu. Small dimensions of eutectic cells in the range of 10 µm assure a homogeneous distribution of the main alloying elements within the matrix after 20 min of annealing at 530 °C. Direct comparison with the same material prepared by mold casting indicates that such short annealing times result in the dissolution of the main primary phase particles but do not assure a homogeneous distribution of the alloying elements in the whole volume of the specimen.

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Effects of different external fields on the microstructure and mechanical properties of novel Al Cu Li alloy during twin-roll casting

Cited by 46 publications

References 27 publications

Improving element uniformity and mechanical properties of Al–Mg–Si alloy fabricated by twin roll casting with superheat melt treatment

Improving element uniformity and mechanical properties of Al–Mg–Si alloy fabricated by twin roll casting with superheat melt treatment

Microstructure of Al–Mg–Si–La alloy under pulsed magnetic field treatment during solidification

High-Temperature Phase Transformations in Al-Li-Cu-Mg-Zr-Sc Alloy Studied via In Situ Electron Microscopy

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