Effect of lanthanum content on microstructure and mechanical properties of Al–5Mg–2Si-0.6Mn alloy in squeeze casting

Zhang, Xingwen; Yang, Yi; Jin, Haini; Sui, Yudong; Jiang, Yehua; Wang, Qudong

doi:10.1016/j.jmrt.2021.11.051

Cited by 15 publications

(6 citation statements)

References 21 publications

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“…The solute elements are segregated in the region of the secondary dendrites arms and produced the formation of the AlFeSi phase. The large amount of the irregular phase AlFeSi with sharp edges continuously distributed at the grain boundary regions, which suffers the severe stress concentration and decreases the mechanical properties of the alloy [38]. Besides, a large amount of the rare earth element La are easily clustered in clumps in the alloy melt, resulting in a very low utilisation rate and forming harmful La-rich phase LaAlSi.…”

Section: Resultsmentioning

confidence: 99%

“…The addition of rare earth elements such as La, Ce, Y, Sm and Er in aluminium alloys has been considered as an effective method to improve the comprehensive properties, which can significantly refined α-Al grains, modified secondary phase from long-strip like β-AlFeSi phase into script-like α-AlFeSi phase, change the numbers of the precipitates, and reduce the impurities of Fe-rich phase at grain boundary simultaneously [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. However, a large amount of rare earth elements are easily clustered in clumps in the alloy melt, resulting in a very low utilisation rate and even lead to the harmful effect on the final properties.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

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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“…When La is added to a 6xxx Al alloy, the castability is improved, and the precipitation of α-AlFeSi phases can be promoted while suppressing that of harmful lath-like β phases [ 15 , 16 , 17 ]. In addition, when La is added to an Al–Cu alloy, the dislocation and grain boundary movement can be effectively suppressed.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of the Corrosion Properties of Al–10%Si–2%Cu Alloys with La Addition

Kim,

Heo,

Yang

et al. 2024

Materials

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Al–10%Si–2%Cu alloys have been widely used in high-value industries (e.g., aerospace and automobiles) because of their lower specific gravity; however, galvanic corrosion rendered these alloys to have poor corrosion resistance. Therefore, the microstructure and corrosion properties of Al–10%Si–2%Cu alloys were investigated with respect to the lanthanum (La) content. All Al alloy samples were synthesized using gravity casting, with added La contents of 0.00, 0.25, 0.50, 0.75, and 1.00 wt%, and were characterized using microstructural characteristics analysis and electrochemical tests. Adding 0.5 wt% La (xLa-0.5) indicated the finest structure, which had a 4% lower α-Al area fraction than the La-free alloy (xLa-0). However, the area fraction of a 1 wt% La-added (xLa-1) alloy was 2.4% higher than that of xLa-0. The corrosion current density (Icorr) of the xLa-0.5 was 1.09 μA/cm2, representing a 68% decrease as compared to that of xLa-0, and xLa-0.5 reached the highest polarization resistance value (7.32 × 103 Ω·cm2). The improvement in corrosion resistance of xLa-0.5 was due to the rapid and dense formation of a passivation layer induced by its fine structure, as well as the precipitated phase by enhancing the dispersibility of Cu.

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“…19 Zhang et al prepared La-doped α-Al + Mg 2 Si alloy and found that when the amount of La was 0.1 wt %, the tensile strength, yield strength, and elongation of the alloy reached their maximum values. 20 Du et al prepared TiAlN films and found that with the addition of La, hardness and elastic modulus increased. It can be seen that the doping of lanthanum can enhance the mechanical properties of materials.…”

Section: Introductionmentioning

confidence: 99%

“…Liu et al doped La into the lattice of LiCoO 2 as pillars to increase the C -axis distance and improve structural stability . Zhang et al prepared La-doped α-Al + Mg 2 Si alloy and found that when the amount of La was 0.1 wt %, the tensile strength, yield strength, and elongation of the alloy reached their maximum values . Du et al prepared TiAlN films and found that with the addition of La, hardness and elastic modulus increased.…”

Section: Introductionmentioning

confidence: 99%

Construction of Lanthanide Magnetic Bio-Based Porous Carbon Materials with Beam and Column Structure and Its Synergistic Adsorption Performance

Zhang,

Guo,

Jia

et al. 2023

ACS Appl. Mater. Interfaces

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Biochar porous carbon material (BPCM) has extraordinary adsorption properties and is being widely used in different fields around the world. The pore structure of BPCM is liable to collapse, and mechanical properties are inferior; hence, the focus is on developing a new ″powerful″ structure of functional BPCM. Rare earth elements with characteristic f orbitals are used as pore and wall strengthening units in this work. The new ″beam and column structure″ BPCM was synthesized by the aerothermal method, and then, the magnetic BPCM was prepared. The results showed that the designed synthesis route was reasonable, BPCM with a steady-state beam and column structure was attained, and the La element played a stabilizing role in maintaining the overall BPCM. The La hybridization exhibits the characteristic of ″the stronger column and weaker beam″, and the La group is the ″column″ to strengthen the BPCM as the ″beam″. The functionalized BPCM (lanthanum-loaded magnetic chitosan-based porous carbon materials, MCPCM@La2O2CO3) obtained exhibited a transcendent efficient adsorption capacity with an average adsorption rate of 6.640 mg·g–1·min–1 and over 85% removal of different types of dye pollutants, which exceeded the adsorption performance of the materials of most other BPCMs. Ultrastructural analysis revealed that MCPCM@La2O2CO3 has a huge specific surface area of 1458.513 m2·g–1 and a magnetization value of 16.560 emu·g–1 for MCPCM@La2O2CO3. A new theoretical model for the adsorption of MCPCM@La2O2CO3 (multiple adsorption coexistence equation) was established. The theoretical equations clarify that the mechanism of pollutant removal by MCPCM@La2O2CO3 is different from the traditional adsorption model, presenting a mechanism of coexistence of multiple adsorption types, displaying a monolayer–multilayer adsorption mechanism, influenced by the synergistic effects of H bonding, electrostatic attraction, π–π conjugation, and ligand interaction. The rapid coordination of the d orbitals of La is an obvious factor in enhancing the adsorption efficiency.

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Effect of lanthanum content on microstructure and mechanical properties of Al–5Mg–2Si-0.6Mn alloy in squeeze casting

Cited by 15 publications

References 21 publications

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

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

Enhancement of the Corrosion Properties of Al–10%Si–2%Cu Alloys with La Addition

Construction of Lanthanide Magnetic Bio-Based Porous Carbon Materials with Beam and Column Structure and Its Synergistic Adsorption Performance

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