Effects of the addition of lanthanum and ultrasonic stirring on the microstructure and mechanical properties of the in situ Mg 2 Si/Al composites

Bai, Guangzhu; Liu, Zheng; Lin, Jixing; Yu, Zhaofu; Hu, Yue; Wen, Cuié

doi:10.1016/j.matdes.2015.10.159

Cited by 39 publications

(10 citation statements)

References 24 publications

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“…From the results of table 2, the rare earth element of La (point 3) has a higher oxygen content, which indicates that the La is oxidized. Because La possessing an active chemical characteristic can be reacted with O, S, P, etc to form high melting point compounds, which can reduce the amount of impurities and prevent the formation of harmful inclusions to purifythe alloy [15,16]. Chen et al [9] studied the effects of La on properties of Cu and found that La easily reacts with impurity elements such as O and S in Cu to form La 2 O 3 and La 2 O 2 S compounds, which can also refine grains.…”

Section: Resultsmentioning

confidence: 99%

“…The position of the grain boundary is preferentially occupied by them, and the S and P which are segregated at the grain boundary are reduced. Therefore, the weakening effect on the grain boundary is eliminated, and the grain boundary is purified [15,16]. Inoue et al [17] found that the solid solubility of La atoms in the Al-La-Cu alloy is very low, thus its concentration in the front of liquid phase was increased, resulting in a component supercooling zone.…”

Section: Introductionmentioning

confidence: 99%

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Effect of La on microstructures and mechanical properties of Cu/Ti₃SiC₂/C nanocomposites sintered by vacuum hot-pressing and hot isostatic pressing

Jiang

Zhang

et al. 2020

Mater. Res. Express

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Researches have shown that the addition of trace amounts of rare earth element lanthanum (La) to the alloys and composites can significantly improve their microstructure and properties. In this work, Cu/Ti 3 SiC 2 /C composites with 0.05wt%, 0.1wt% and 0.3wt% La were prepared by powder metallurgy methodthrough mechanical alloying, hot-pressing (HP) and hot isostatic pressing (HIP). The effects of different La contents on the microstructure and mechanical properties of Cu/Ti 3 SiC 2 /C composites were investigated. The results show that La has a refinement effect on the grain of the matrix, and with the increase of La content, the size of the matrix of the composite becomes smaller. As the content of La increases, the performance of the composite exhibits a tendency to increase first and then decrease. The composite of 0.1wt% La exhibited the best performance with a hardness of 97.8 MPa, a tensile strength of 174.9 MPa, and a compressive strength and shear strength of 461.1 MPa and 102.1 MPa, respectively. Since the dimple is observed, the tensile fracture indicates that the fracture mode is a ductile fracture. The enhancement mechanism of La mainly includes dispersion strengthening and fine grain strengthening.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of La on microstructures and mechanical properties of Cu/Ti₃SiC₂/C nanocomposites sintered by vacuum hot-pressing and hot isostatic pressing

Jiang

Zhang

et al. 2020

Mater. Res. Express

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“…Dendrite fragmentation caused by cavitation is more effective and dominant when the temperature of UST is lower than the liquidus temperature [21,22]. This is attributed to the fact that the solid fraction of the alloy increases as the melt begins to solidify, and the shear stress produced by the collapse of cavitation bubbles can break the dendrites.…”

Section: Mechanism Discussionmentioning

confidence: 99%

Effects of Ultrasonic Treatment on the Microstructure and Mechanical Properties of Mg-3Y-3.5Sm-2Zn-0.6Zr (wt %) Alloy

Liu

Wang

et al. 2019

Materials

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Ultrasonic treatment (UST) was applied in the smelting process of Mg-3Y-3.5Sm-2Zn-0.6Zr (wt %) alloy and the microstructure as well as mechanical properties of the experimental alloy were investigated. Results showed that the effect of UST on grain refinement was obvious, and the distribution of the second phases along grain boundary became discontinuous. The width of the grain boundary precipitates decreased after UST. The contents of solute elements within grains increased, and the morphologies of Zr-rich compounds and Y-rich compounds both at grain boundaries and within grains changed after UST. The mechanical properties of the experimental alloy after UST were significantly improved. The ultimate tensile strength (UTS) was 265 MPa, the tensile yield strength (TYS) was 171 MPa, and the elongation (EL) was 11%. The mechanism of UST of the alloy can be attributed to the combined effects of cavitation-induced heterogeneous nucleation and melt convection induced by acoustic streaming, resulting in the refinement of grains and the grain boundary precipitates, which promoted the improvement of mechanical properties.

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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%

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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Effects of the addition of lanthanum and ultrasonic stirring on the microstructure and mechanical properties of the in situ Mg 2 Si/Al composites

Cited by 39 publications

References 24 publications

Effect of La on microstructures and mechanical properties of Cu/Ti₃SiC₂/C nanocomposites sintered by vacuum hot-pressing and hot isostatic pressing

Effect of La on microstructures and mechanical properties of Cu/Ti₃SiC₂/C nanocomposites sintered by vacuum hot-pressing and hot isostatic pressing

Effects of Ultrasonic Treatment on the Microstructure and Mechanical Properties of Mg-3Y-3.5Sm-2Zn-0.6Zr (wt %) Alloy

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

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Effects of the addition of lanthanum and ultrasonic stirring on the microstructure and mechanical properties of the in situ Mg 2 Si/Al composites

Cited by 39 publications

References 24 publications

Effect of La on microstructures and mechanical properties of Cu/Ti3SiC2/C nanocomposites sintered by vacuum hot-pressing and hot isostatic pressing

Effect of La on microstructures and mechanical properties of Cu/Ti3SiC2/C nanocomposites sintered by vacuum hot-pressing and hot isostatic pressing

Effects of Ultrasonic Treatment on the Microstructure and Mechanical Properties of Mg-3Y-3.5Sm-2Zn-0.6Zr (wt %) Alloy

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

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Effect of La on microstructures and mechanical properties of Cu/Ti₃SiC₂/C nanocomposites sintered by vacuum hot-pressing and hot isostatic pressing

Effect of La on microstructures and mechanical properties of Cu/Ti₃SiC₂/C nanocomposites sintered by vacuum hot-pressing and hot isostatic pressing