Crystallization of primary Mg2Si in Al-20Mg2Si alloy with various molar ratios of Ca/Sb

Yu, Hong-Chen

doi:10.1016/j.jallcom.2019.02.158

Cited by 10 publications

(6 citation statements)

References 55 publications

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“…In this Al–Mg 2 Si system, Ca and Sb are likely to react with each other due to the large electronegativity difference of 1.05, resulting in the formation of various stoichiometric compounds [ 31 ]. Yu [ 32 , 33 ] investigated the crystallization behavior of primary Mg 2 Si in composites with different Ca/Sb molar ratios. In their study, the total mass concentration of Ca and Sb was 0.5%, in which the addition levels of Ca and Sb were determined to be within the range of 0.05%–0.25% and 0.25%–0.45%, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…When the system temperature changed from 700 to 1000 °C, the

values fell in the range of −411 to −473 kJ/mol, which proved the feasibility of this reaction due to the large negative values. In comparison with the formation reaction of CaSb 2 [ 32 ], the precipitation of Ca 5 Sb 3 possesses a much lower

value, meaning a greater tendency for the formation of Ca 5 Sb 3 .…”

Section: Resultsmentioning

confidence: 99%

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Microstructure Evolution and Performance Improvement of Hypereutectic Al–Mg2Si Metallic Composite with Ca or Sb

et al. 2020

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In this article, the modification effects on Al–Mg2Si before and after heat treatment were investigated with Ca, Sb, and (Ca + Sb). In comparison with single Ca or Sb, the samples with composition modifiers (Ca + Sb) had the optimal microstructure. The sample with a molar ratio for Ca-to-Sb of 1:1 obtained relatively higher properties, for which the Brinell hardness values before and after heat treatment were remarkably increased by 31.74% and 28.93% in comparison with bare alloy. According to differential scanning calorimetry analysis (DSC), it was found that the nucleation behavior of the primary Mg2Si phase could be significantly improved by using chemical modifiers. Some white particles were found to be embedded in the center of Mg2Si phases, which were deduced to be Ca5Sb3 through X-ray diffraction (XRD) and field-emission scanning electron microscope (FESEM) analyses. Furthermore, Ca5Sb3 articles possess a rather low mismatch degree with Mg2Si particles based on Phase Transformation Crystallography Lab software (PTCLab) calculation, meaning that the efficient nucleation capability of Ca5Sb3 for Mg2Si particles could be estimated.

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Section: Resultsmentioning

confidence: 99%

“…When the system temperature changed from 700 to 1000 °C, the

value, meaning a greater tendency for the formation of Ca 5 Sb 3 .…”

Section: Resultsmentioning

confidence: 99%

Microstructure Evolution and Performance Improvement of Hypereutectic Al–Mg2Si Metallic Composite with Ca or Sb

et al. 2020

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“…[31] The matching degree between two adjacent phases was reported to depend on the misfit degree between the crystal planes at the interface of phases, which means that the lower mismatch degree would have an improvement effect on the nucleation occurrence during the solidification process. Based on Bramfitt's theory, Yu et al [32] calculated the crystal relationship between CaSb 2 and Mg 2 Si and revealed that the mismatch between ð001Þ CaSb 2 and ð001Þ Mg 2 Si was as low as 4.2%, indicating the excellent efficiency of CaSb 2 as the heterogeneous nucleation site of primary Mg 2 Si phase. In order to reveal more information about the possible structural relationships, the mismatch degrees between Mg 2 Si and CaSb 2 phase were obtained using PTCLab and clearly listed in Figure 13.…”

Section: Composite Modification Mechanism For Al-mg 2 Si Alloy By Al-...mentioning

confidence: 99%

Microstructure Control and Performance Evolution of Hypereutectic Al–20Mg₂Si Alloy by Novel Al–Ca–Sb Masteralloy

Zuo

Liu

et al. 2023

Adv Eng Mater

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Herein, the microstructure control and performance evolution of hypereutectic Al–20Mg2Si alloy with the addition of novel Al–3.3Ca–10Sb master alloy are investigated. It is found that AlCa11Sb9 and CaSb2 compounds are successfully synthesized through in situ melt reaction of masteralloy. With 0.45 wt% Al–3.3Ca–10Sb master alloy addition, primary Mg2Si particles in hypereutectic Al–20Mg2Si alloy are significantly refined from more than 150 μm to 10.7 μm, which are accompanied with the 3D morphologies changing from dendrites to octahedrons. After heat treatment, Brinell hardnesses of Al–20Mg2Si alloys are remarkably improved to 112 HB. Furthermore, it is also found that the cooling rate of Al–3.3Ca–10Sb master alloys has certain influence on the refinement effect of Al–Mg2Si alloys. The excellent complex modification of this master alloy on Al–20Mg2Si alloy can be attributed to the existence of CaSb2 particles as the heterogeneous nucleation sites of Mg2Si particles and the inhibiting growth effect of residual Ca atoms adsorbed on the surface of Mg2Si phase.

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“…[7,8] It is widely used as lightweight material in aerospace, automobile, and other fields, such as safety-belt pretensioner, brake disc, and shock absorbing cover. [9,10] In the last two decades, studies about Al-Mg 2 Si composites mainly focused on the hypereutectic Al-Mg 2 Si composites, [2,[11][12][13][14] and the refinement, growth behaviors, and modification phenomena of primary Mg 2 Si phase are discussed in detail. However, the hypoeutectic and near-eutectic Al-Mg 2 Si alloys have better plasticity and comprehensive mechanical properties than hypereutectic Al-Mg 2 Si alloys.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Microstructure and Mechanical Properties of Near‐Eutectic Al–Mg₂Si Alloys by Eu Addition

et al. 2021

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To modify the microstructure and improve the tensile properties of Al–Mg2Si alloys, different contents of Eu are added into near‐eutectic Al–Mg2Si alloys by melting. Results show that the near‐eutectic Al–Mg2Si alloys consist of primary α‐Al, the first eutectic and second eutectic (Al + Mg2Si) phases, and a few Fe‐containing phase. When the addition of Eu reaches 0.05%, the first eutectic structure is refined, and the first eutectic Mg2Si phase transforms from platelet into fiber. Meanwhile, the second eutectic phase increases, even that the alloy is almost the second eutectic phase when the Eu content is 0.3%. These changes are induced by the modification of Eu. Tensile testing shows that the ductility and the strength are improved to 8.6% and 178 MPa from 1% and 145 MPa when the Eu content is 0.05%, and fracture mode is also changed. This improvement is caused by the modification of the eutectic structure. The tensile properties are decreased or even deteriorated with further increasing the Eu content, which is induced by over‐modification of Eu addition. It is concluded that the modification of eutectic Mg2Si phase by Eu addition contributes to the enhancement of mechanical properties of the near‐eutectic Al–Mg2Si alloys.

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Crystallization of primary Mg2Si in Al-20Mg2Si alloy with various molar ratios of Ca/Sb

Cited by 10 publications

References 55 publications

Microstructure Evolution and Performance Improvement of Hypereutectic Al–Mg2Si Metallic Composite with Ca or Sb

Microstructure Evolution and Performance Improvement of Hypereutectic Al–Mg2Si Metallic Composite with Ca or Sb

Microstructure Control and Performance Evolution of Hypereutectic Al–20Mg₂Si Alloy by Novel Al–Ca–Sb Masteralloy

Improvement of Microstructure and Mechanical Properties of Near‐Eutectic Al–Mg₂Si Alloys by Eu Addition

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Crystallization of primary Mg2Si in Al-20Mg2Si alloy with various molar ratios of Ca/Sb

Cited by 10 publications

References 55 publications

Microstructure Evolution and Performance Improvement of Hypereutectic Al–Mg2Si Metallic Composite with Ca or Sb

Microstructure Evolution and Performance Improvement of Hypereutectic Al–Mg2Si Metallic Composite with Ca or Sb

Microstructure Control and Performance Evolution of Hypereutectic Al–20Mg2Si Alloy by Novel Al–Ca–Sb Masteralloy

Improvement of Microstructure and Mechanical Properties of Near‐Eutectic Al–Mg2Si Alloys by Eu Addition

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Product

Resources

About

Microstructure Control and Performance Evolution of Hypereutectic Al–20Mg₂Si Alloy by Novel Al–Ca–Sb Masteralloy

Improvement of Microstructure and Mechanical Properties of Near‐Eutectic Al–Mg₂Si Alloys by Eu Addition