Effect of La Addition on Solidification Behavior and Phase Composition of Cast Al-Mg-Si Alloy

Деев, В. Б.; Прусов, Е. С.; Шуркин, П. К.; Ri, E. H.; Smetanyuk, S. V.; Chen, Xizhang; Konovalov, S. V.

doi:10.3390/met10121673

Cited by 10 publications

(3 citation statements)

References 35 publications

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“…Eutectic alloys based on Al-Ni [1][2][3][4][5][6][7][8][9], Al-Ce(La) [9][10][11][12][13][14][15][16][17][18], and Al-Ca [17][18][19][20][21][22][23][24] systems have been considered an alternative to Al-Si alloys because they can also ensure high fluidity and resistance to hot cracking during solidification. In addition to eutectic-forming elements, high-soluble elements such as Mg, Cu, and Zn are used to increase the strength by the formation of shearable precipitates after quenching and aging treatment.…”

Section: Introductionmentioning

confidence: 99%

Phase Composition and Microstructure of Cast Al-6%Mg-2%Ca-2%Zn Alloy with Fe and Si Additions

Doroshenko,

Shurkin,

Sviridova

et al. 2023

Metals

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Investigating the effect of Fe and Si is essential for any new Al-based composition, as these impurities can be easily found both after primary production and recycling. This study is dedicated to filling the gap in revealing the phase composition of an Al-6%Mg-2%Ca-2%Zn alloy after the combined and separate addition of Fe and Si. This was addressed by permanent mold casting and solid solution heat treatment. The investigation of slowly solidified samples also contributed to understanding potential phase transitions. It was found that the alloy containing 0.5%Fe can have nearly spherical intermetallics after heat treatment, whereas a higher Fe content brought the formation of a needle-shaped Al3Fe intermetallic. We explain this by the formation of a ternary α-Al + Al10CaFe2 + Al4Ca eutectic, which is more compact in as-cast condition compared to divorced binary α-Al + Al4Ca and α-Al + Al3Fe eutectics. Similarly, 0.5%Si readily incurred the formation of a needle-shaped Al2CaSi2 intermetallic, probably also by a binary reaction L → α-Al + Al2CaSi2. In the solidified samples, no Mg2Si phase was found, even in slowly solidified samples. This is contrary to the thermodynamic calculation, which suggests a peritectic reaction L + Al2CaSi2 Mg2Si. Interestingly, the addition of 0.5%Si caused an even coarser microstructure compared to the addition of 1%Fe, which caused the appearance of a primary Al3Fe phase. We conclude that the new alloy is more tolerable to Fe rather than Si. Specifically, the addition of 0.5%Fe can be added while maintaining a fine morphology of the eutectic network. It was suggested that the morphology of eutectic and solid solution hardening governed the mechanical properties. The strength of the alloys containing separate 0.5%Fe (UTS = 215 ± 8 MPa and YS 146 ± 4 = MPa) and the combined 0.5%Fe and 0.5%Si additions (UTS = 195 ± 14 MPa and YS ± 1 = 139 MPa) was not compromised compared to the alloy containing 0.5%Si (UTS 201 ± 24 = MPa and YS = 131 ± 1 MPa).

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Section: Introductionmentioning

confidence: 99%

Phase Composition and Microstructure of Cast Al-6%Mg-2%Ca-2%Zn Alloy with Fe and Si Additions

Doroshenko,

Shurkin,

Sviridova

et al. 2023

Metals

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“…T o date, aluminum alloys modified with rare earth metals are increasingly used in the aircraft industry, automotive industry, civil engineering, and other economy-forming industries, due to their superior mechanical, physical and corrosion resistance properties [1][2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the ytterbium reduction process in the synthesis of Al – Yb master alloys for the modification of aluminum alloys

Bazhin¹,

Savchenkov²,

Gordevnin³

2022

nfm

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This work investigates the synthesis process and characterization of a novel type of aluminum-ytterbium master alloy in molten salts. The significance of the obtained results for the research conducted in the field so far is due to the previously proven effectiveness of the influence of ytterbium on the structure and properties of aluminum alloys. During experimental work, the thermodynamic analysis of the aluminothermic process of ytterbium fluoride reduction from molten salts was performed and revealed that the process might occur and develop in the presence of sodium fluoride and potassium chloride if the NaYbF 4 precursor is formed. Subsequently, the temperature intervals of thermal effects during the process of reduction of ytterbium from its fluoride in molten salts (NaF -KCl) by aluminum were determined as a result of thermal analysis. During Al -Yb master alloys synthesis experiments, the maximal value of ytterbium extraction to master alloy of 82.5% was achieved by changing the process parameters, such as temperature, reaction time, and molten salts/aluminium ratios. Besides, master alloys containing ytterbium from 1.1 to 5.1 wt.% were synthesized using the optimized technological process conditions and examined with metallographic analysis. The analysis revealed that the microstructure of the synthesized master alloys is presented by eutectic colonies of Al + Al 3 Yb composition located along the boundaries of α-Al dendritic cells. It was found that about 85.5% of the area of the studied samples with ytterbium content of 5.1 wt.% consist of aluminum dendrites with an average cell size of 25 μm. The presented in this research results are of significant importance for the development of cheap and high-quality aluminum alloys.

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“…However, the literature contains very limited information on the use of melt overheating technique on alloys of the Al-Mg and Al-Mg-Si systems. At the same time, casting alloys based on the Al-Mg-Si system, belonging to the AA 5xx.x series (Aluminum Association, Arlington, VA, USA), have significant potential for application in the automotive, shipbuilding and aerospace industries, therefore, the search for effective ways to obtain a modified structure in them is an industrially significant task [34]. At present, alloys of this system are mainly modified with expensive additives of transition metals such as Zr, Hf, Nb, Sc, etc.…”

Section: Introductionmentioning

confidence: 99%

Effect of Melt Overheating on Structure and Mechanical Properties of Al-Mg-Si Cast Alloy

Деев

Прусов

et al. 2021

Metals

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The paper discusses the complex effect of melt overheating with subsequent fast cooling down to the pouring temperature on the crystallization process, microstructure and mechanical properties of Al-Mg-Si aluminum alloy. The results obtained facilitated the establishment of rational modes of melt overheating, leading to a significant change in the dispersion and morphology of structural components. In particular, with an increase in the melt overheating temperature to 900 °C with holding and subsequent rapid cooling to the casting temperature, a decrease in the average size of dendritic cells of the aluminum solid solution from 39 μm to 13 μm was observed. We also noticed the refinement of eutectic inclusions of the Mg2Si phase with compact morphology. An increased level of mechanical properties was noted; the maximum values of tensile strength and elongation reached 228 MPa and 5.24%, respectively, which exceeded the initial values by 22.5% and 52.3%, correspondingly. The microhardness of the aluminum solid solution sequentially increased from 38.21 to 56.5 HV with an increase in the temperature during melt overheating. According to the EDS linear scanning, an increase in the superheat temperature of the melt is accompanied by an increase in the degree of saturation of the solid solution with magnesium.

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Effect of La Addition on Solidification Behavior and Phase Composition of Cast Al-Mg-Si Alloy

Cited by 10 publications

References 35 publications

Phase Composition and Microstructure of Cast Al-6%Mg-2%Ca-2%Zn Alloy with Fe and Si Additions

Phase Composition and Microstructure of Cast Al-6%Mg-2%Ca-2%Zn Alloy with Fe and Si Additions

Investigation of the ytterbium reduction process in the synthesis of Al – Yb master alloys for the modification of aluminum alloys

Effect of Melt Overheating on Structure and Mechanical Properties of Al-Mg-Si Cast Alloy

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