Effects of Bi-Sb Addition and Solution Treatment on Microstructures and Mechanical Properties of Al-20 wt.% Mg2Si Composites

Lv, Jie; Dong, Hao; Fan, Lichang; Yu, Wenbin; Li, Lü

doi:10.1007/s11665-019-04081-4

Cited by 11 publications

(3 citation statements)

References 47 publications

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“…When the Mg content is 2.51%, the morphology of the Al 8 Mg 3 FeSi 6 phase is mostly continuous or semi-continuous strip. It is similar to eutectic Si in the matrix alloy, which increase the splitting effect on the substrate [24]. At the same time, since the melting point of the Ferich phase is higher, it is formed in preference to the Mg 2 Si phase during solidification, so the content of the Mg 2 Si phase in the microstructure is reduced.…”

Section: Resultsmentioning

confidence: 99%

Effect of Mg addition on microstructure and mechanical properties of Al-Si-Cu-Fe alloy with squeeze casting

Jiang

et al. 2019

Mater. Res. Express

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In this work, the Al-10Si-2.5Cu-0.8Fe alloy was used as the base alloy to squeeze casting with different content Mg-10Al master alloy addition. The effects of microstructure and mechanical properties were investigated by XRD, OM, SEM, and tensile test analysis. The results show that with the increase of Mg addition, the morphology of eutectic Si in the alloy changes from strip to fiber and the size is obviously reduced. Al 8 Mg 3 FeSi 6 phase in the microstructure gradually grows, and the splitting effect on the matrix structure is increased. The tensile strength and elongation of the alloy increased first and then decreased with the increase of Mg content. When the Mg content is 1.38%, the tensile strength of the alloy reached a maximum of 289 MPa and the elongation is 2.24%. The hardness of the alloy gradually increases. When the Mg content is 2.51%, the hardness reaches 121.8 HV. The cleavage surface in the fracture becomes fine with the increase of Mg content, the number of dimples increases, and the fracture mode transitions from quasi-cleavage fracture to brittle fracture.

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Section: Resultsmentioning

confidence: 99%

Effect of Mg addition on microstructure and mechanical properties of Al-Si-Cu-Fe alloy with squeeze casting

Jiang

et al. 2019

Mater. Res. Express

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“…Numerous researchers indicated that Ni plays an important role in improving the room and high-temperature strength because created intermetallic compound Al3Ni can remain stable below 350 °C [29][30][31][32][33][34][35]. In addition, the structure of endogenously-reinforced composites could be controlled by changing the cooling rate during crystallization and finally achieving a determined degree of properties [36]. The goal of the current study is to develop hybrid aluminum matrix composite (HAMC) reinforced with in-situ formed Mg2Si and Al3Ni particles via casting method and to evaluate the effect of thermal conditions of solidification on the morphology and size distribution of in-situ reinforcing phases.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Aluminum Matrix Composites Reinforced With in Situ Mg2si and Al3ni Phases

Ramezanalizadeh¹

2022

IJMMT

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Aluminum matrix cast composites (AMCCs) are engaged materials for the fabrication of accountable and especially acute pieces utilized in the high-tech scope of industry such as automotive, aerospace, electronics, etc. In the present study, hybrid aluminum base composite reinforced with in-situ produced Mg2Si and Al3Ni particles were fabricated successfully in casting moods, and the structural features of inborn reinforcing compounds was evaluated in different thermal situations of solidification. For this issue, the composite microstructure was characterized by X-ray diffraction (XRD) and optical microscope (OM). In addition, the mechanical properties were evaluated by hardness test. According to the results, increasing in the cooling rate during solidification leads to the reduction of mediate size of the Mg2Si initially crystals, enhancement of their dispensation uniformity and clear increasing of their final amount; meanwhile, the average size of Al3Ni particles decreases significantly but their content is almost the same for different conditions.

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“…Based on this, the complex modification treatment deserves more attention, owing to the considerable potential for the microstructural optimization of metallic alloys. Lv et al revealed [ 26 ] that primary Mg 2 Si particles were significantly refined from 95 μm to 10 μm with 2.0% Sb and 0.2% Bi, for which the Brinell hardness was increased up to 134.67 after heat treatment. Based on the rather low planar mismatch δ between (111) Mg 2Si and (0001) Mg 3Sb 2 of 1.79%, Mg 3 Sb 2 could act as the heterogeneous nucleation site for primary Mg 2 Si, and with the cooperative absorption behavior of Bi on the growth front, the primary Mg 2 Si dendrites would be obviously refined.…”

Section: Introductionmentioning

confidence: 99%

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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Effects of Bi-Sb Addition and Solution Treatment on Microstructures and Mechanical Properties of Al-20 wt.% Mg2Si Composites

Cited by 11 publications

References 47 publications

Effect of Mg addition on microstructure and mechanical properties of Al-Si-Cu-Fe alloy with squeeze casting

Effect of Mg addition on microstructure and mechanical properties of Al-Si-Cu-Fe alloy with squeeze casting

Hybrid Aluminum Matrix Composites Reinforced With in Situ Mg2si and Al3ni Phases

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

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