Effect of minor lanthanum on the microstructures, tensile and electrical properties of Al-Fe alloys

Jiang, Hongxiang; Li, Shixin; Zheng, Qiantao; Zhang, Lili; He, Jie; Song, Yan; Deng, Congkun; Zhao, Jiuzhou

doi:10.1016/j.matdes.2020.108991

Cited by 49 publications

(10 citation statements)

References 47 publications

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“…Additionally, Ce showed a more detrimental effect in porosity formation because of greater oxidation tendency when compared to La [14]. Meanwhile, La is ubiquitously used as an addition for achieving favorably fine α-Al [15,16], eutectic silicon [1], Fe-bearing phases [5,13], as well as Mg 2 Si phase [17,18], one of the main structural components in 511 type cast aluminum alloys studied in this paper.…”

Section: Introductionmentioning

confidence: 87%

“…It is of particular note that in the experimental alloys, Al 13 Fe 4 shows a short flake-like shape at a relatively high Fe content (up to 0.12 wt.%). Indeed, it was reported that La may hamper the orientation growth of the Al 13 Fe 4 phase in a similar manner as of Mg 2 Si phase [5]. However, La content of more than 0.25 wt.% brings degradation and formation of very coarse acicular intermetallics related to the AlLaSi phase, which may act as stress raisers, thus being detrimental to mechanical properties.…”

Section: Microstructural Evolutionmentioning

confidence: 99%

“…Recently, many studies showed that micro-alloying with rare earth (RE) elements may have remarkable effects related to refining of the as-cast structure, thus making them efficient modification agents for aluminum alloys [1][2][3][4][5]. Among the Light Rare-Earth Elements (LREE), also known as the cerium group (Sc, La, Ce, Pr, Nd, Pm, Sm, Eu, and Gd), lanthanum and cerium are the most abundant in the Earth's crust (31 ppm and 63 ppm, respectively) and the least expensive [6].…”

Section: Introductionmentioning

confidence: 99%

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

Деев

Прусов

Шуркин

et al. 2020

Metals

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The current study focusses on the phase composition, solidification path, and microstructure evaluation of gravity cast Al-4Mg-0.5Si-xLa aluminum alloy, where x = 0, 0.1, 0.25, 0.5, 0.75, and 1 wt.% La. A computational CalPhaD approach implemented in Thermo-Calc software and scanning electron microscopy technique equipped with electron microprobe analysis (EMPA) was employed to assess its above-mentioned characteristics. The thermodynamic analysis showed that the equilibrium solidification path of La-containing Al-Mg-Si alloys consists of only binary phases LaSi2 and Mg2Si precipitation along with α-Al from the liquid and further solid-state transformation of this mixture into α-Al + Al11La3 + Mg2Si + Al3Mg2 composition. Scheil–Gulliver simulation showed a similar solidification pathway but was accompanied by an increase in the solidification range (from ~55 °C to 210 °C). Furthermore, microstructural observations were congruent with the calculated fraction of phases at 560 °C and related to α-Al + LaSi2 + Mg2Si three-phase region in terms of formation of La-rich phase having both eliminating effect on the eutectic Mg2Si phase. Quantitative EMPA analysis and elemental mapping revealed that the La-rich phase included Al, La, and Si and may be described as Al2LaSi2 phase. This phase shows a visible modifying effect on the eutectic Mg2Si phase, likely due to absorbing on the liquid/solid interface.

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Section: Introductionmentioning

confidence: 87%

Section: Microstructural Evolutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Деев

Прусов

Шуркин

et al. 2020

Metals

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“…Therefore, understanding the relationship between the mechanical stress and the electronic characteristics or electron transport mechanism can help avoid catastrophic failure when working in harsh environments and is key to the practical applications of SiC NWs-based devices in a mechanically disturbed environment, especially for ultra-thin SiC NWs. Furthermore, based on such relationships, high-performance stress/pressure sensors can be made with ultra-thin SiC NWs [7] and applying mechanical stress can be used as one effective way to control electrical properties by means of the tensile behavior [25,26]. SiC NWs could be a promising material for electrical control switches.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Tensile Strain on Electron Transport of Ultra-Thin SiC Nanowires

Tan,

Li,

Liu

et al. 2024

Molecules

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The influence of nanomechanical tensile behavior on electron transport is especially interesting for ultra-thin SiC nanowires (NWs) with different diameters. Our studies theoretically show that these NWs can hold stable electron transmission in some strain ranges and that stretching can enhance the electron transmission around the Fermi level (EF) at the strains over 0.5 without fracture for a single-atom SiC chain and at the strains not over 0.5 for thicker SiC NWs. For each size of SiC NW, the tensile strain has a tiny effect on the number of device density of states (DDOSs) peaks but can increase the values. Freshly broken SiC NWs also show certain values of DDOSs around EF. The maximum DDOS increases significantly with the diameter, but interestingly, the DDOS at EF shows little difference among the three sizes of devices in the late stage of the stretching. Essentially, high electron transmission is influenced by high DDOSs and delocalized electronic states. Analysis of electron localization functions (ELFs) indicates that appropriate tensile stress can promote continuous electronic distributions to contribute electron transport, while excessively large stretching deformation of SiC NWs would split electronic distributions and consequently hinder the movement of electrons. These results provide strong theoretical support for the use of ultra-thin SiC NWs in nano-sensors for functional and controllable electronic devices.

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“…Recently, attention is shifting to the synergistic effect of La and other elements, such as B [19], Mg [20], and Sr [21], on microstructures of aluminum alloys. Our latest work demonstrates that only a few hundred ppm of La is enough to improve the microstructures [22][23][24]. Considering the wide use of Al-5Ti-1B and great potentials of La in improving microstructure, it is necessary to explore the combined effect of TiB 2 particles and trace La on microstructure evolution of aluminum alloys.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effect of La and TiB2 Particles on Grain Refinement in Aluminum Alloy

et al. 2022

Self Cite

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Synergistic effect of TiB2 (in form of Al-5Ti-1B) and La on grain refining results in Al-2Cu alloy was investigated. α-Al grains are significantly refined by Al-5Ti-1B. When trace La is added to the melt, further refinement is exhibited. Average grain size and nucleation undercooling of α-Al reduce first and then almost remain unchanged with La addition. Satisfactory grain refining result achieves when La addition level reaches 600 ppm. When more than 600 ppm La is added to the melt, La-rich particles form and the effect of solute La left in matrix on the microstructure almost no longer changes. Theoretical calculation results demonstrate that solute La segregates to Al melt/TiB2 particles interface along with Ti and Cu prior to α-Al nucleation and the synergistic effect of La and TiB2 particles on grain refinement mainly attributes to the enhancement in the potency of TiB2 particles to heterogeneously nucleate α-Al by trace La addition.

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Effect of minor lanthanum on the microstructures, tensile and electrical properties of Al-Fe alloys

Cited by 49 publications

References 47 publications

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

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

Influence of the Tensile Strain on Electron Transport of Ultra-Thin SiC Nanowires

Synergistic Effect of La and TiB2 Particles on Grain Refinement in Aluminum Alloy

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