Effects of heat treatment and addition of small amounts of Cu and Mg on the microstructure and mechanical properties of Al-Si-Cu and Al-Si-Mg cast alloys

Beroual, Said; Boumerzoug, Zakaria; Paillard, Pascal; Borjon-Piron, Yann

doi:10.1016/j.jallcom.2018.12.365

Cited by 90 publications

(39 citation statements)

References 27 publications

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“…In detail, the gray continuous phase is Al matrix and the dark grey part is Si phase with two categories (i.e., bulk primary Si phase and acicular eutectic Si phase). As revealed by [ 32 ], the strength of as-cast Al-Si alloy is governed by rigid eutectic Si phase due to its three dimensional network structure with the higher Young’s modulus embedded in ductile α-Al phase [ 32 ].…”

Section: Resultsmentioning

confidence: 99%

Morphological Evolutions of Ni-Rich Phases in Al-Si Piston Alloys during 250–400 °C Thermal Exposure Processes

Geng

Bian

et al. 2020

Materials

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The thermal stability of the Al-Si alloys during the thermal exposure process from 250 °C to 400 °C was systematically investigated. The relationships between the morphological evolution and the mechanical changes of the alloys were determined through the Vickers hardness test and materials characterization method. Initially, the alloys exhibited similar thermal degradation behavior. For example, the exposure process of the alloy at 300 °C can be divided into two stages according to the changes of the alloy hardness and the matrix micro-hardness. In detail, the first stage (0–2 h) exhibited a severe reduction of the alloy hardness while the second stage showed a more leveled hardness during the following 98 h. There are three identified morphological characteristics of Ni-rich phases in the alloy. Furthermore, the differences in both composition and the micro-hardness between these Ni-rich phases were confirmed. The underlying relationships between the morphological transformation of the Ni-rich phases and hardness fluctuation in the alloy were correlated and elucidated. The observed alloy hardness increase when the exposure temperature was 400 °C was unexpected. This behavior was explained from the perspectives of both Ni-rich phases evolution and dispersoid formation.

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Section: Resultsmentioning

confidence: 99%

Morphological Evolutions of Ni-Rich Phases in Al-Si Piston Alloys during 250–400 °C Thermal Exposure Processes

Geng

Bian

et al. 2020

Materials

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“…The Fe-bearing phase were not dominant in aged specimens, since aged specimens were subjected to solution treatment and aging treatment. The Febearing phase dissolved into the matrix during solution treatment and led to the reduction of Fe-bearing phase in aged specimens [25,26]. Some bulk Cu-bearing phase can be found in aged specimens.…”

Section: Typical Intermetallicsmentioning

confidence: 99%

Crack Initiation Mechanism in Casting AC4B Aluminum Alloy Parts with Complex Structure

Yang²,

Deng³

et al. 2021

Metals

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Hot tears were frequently formed in Aluminum (Al) parts with complex structure. In this study, OM (optical microscope), SEM (scanning electron microscope), EDS (energy dispersive spectrometer), and FDM (finite difference method) were used to reveal the hot tears mechanisms in the casted AC4B Al engine. Shrinkage porosities with the size of 300–500 μm were found in casted specimens near the parts’ surface. Many cracked brittle Fe-bearing phase were also found in crack section. The secondary dendrite arm spacing observation in five typical positions showed that the cooling rate in position 5 was faster than that in position 1. The impropriety solidification sequence in position 5 and position 1 impeded the solidification feeding of position 1, and it might lead to casting defects or even casting cracks. Numerical simulation also showed that solidification sequence promoted casting defects, which was accordant with microstructure observation. Impurity may concentrate at position 5 during filling. It is concluded that large β-Fe intermetallics and improper solidification sequence together contributed to crack initiation in the engine.

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“…The addition of Mg forms ne Mg 2 Si precipitate after heat treatment, and then enhances the mechanical properties of the alloys [7]. The addition of Cu forms Al 2 Cu phase, which also improves the strength of the alloys [8,9], but signi cantly reduces the corrosion resistance [10]. Therefore, the combined addition of Mg and Mn is selected instead of Mg and Cu.…”

Section: Introductionmentioning

confidence: 99%

Microstructure, Properties and Corrosion Resistance of As-Cast Al-12Si-1.0Mn-0.6Mg-xSc Alloys

Yang

Wang

Peng

et al. 2021

Preprint

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Al-12Si-1.0Mn-0.6Mg-xSc (x = 0, 0.1, 0.2, and 0.3) alloys for electronic packaging were prepared by ingot metallurgy, and the microstructure, mechanical properties, thermo-physical properties and corrosion resistance were compared. A fine and dispersed Al3Sc phase is observed and the acicular β-Fe phase transforms into a Chinese character or massive α-Fe phase in the alloys with Sc addition. When the Sc content increases from 0 to 0.3%, the secondary dendritic arm spacing and the size of the eutectic Si reduce from 17.9 μm and 5.3 μm to 12.8 μm and 3.1 μm, respectively. Simultaneously, the morphology of eutectic Si changes from a rough long rod to an ellipsoid. The thermal expansion coefficient and thermal conductivity of the alloys reduce slightly with increasing the Sc content. The flexural strength of 291.9 MPa is obtained for the Al-12Si-1.0Mn-0.6Mg-0.3Sc, an increment of 20.4% as compared with the Sc-free alloy. Furthermore, the corrosion resistance of the alloys is improved by the minor Sc addition.

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Effects of heat treatment and addition of small amounts of Cu and Mg on the microstructure and mechanical properties of Al-Si-Cu and Al-Si-Mg cast alloys

Cited by 90 publications

References 27 publications

Morphological Evolutions of Ni-Rich Phases in Al-Si Piston Alloys during 250–400 °C Thermal Exposure Processes

Morphological Evolutions of Ni-Rich Phases in Al-Si Piston Alloys during 250–400 °C Thermal Exposure Processes

Crack Initiation Mechanism in Casting AC4B Aluminum Alloy Parts with Complex Structure

Microstructure, Properties and Corrosion Resistance of As-Cast Al-12Si-1.0Mn-0.6Mg-xSc Alloys

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Effects of heat treatment and addition of small amounts of Cu and Mg on the microstructure and mechanical properties of Al-Si-Cu and Al-Si-Mg cast alloys

Cited by 90 publications

References 27 publications

Morphological Evolutions of Ni-Rich Phases in Al-Si Piston Alloys during 250–400 °C Thermal Exposure Processes

Morphological Evolutions of Ni-Rich Phases in Al-Si Piston Alloys during 250–400 °C Thermal Exposure Processes

Crack Initiation Mechanism in Casting AC4B Aluminum Alloy Parts with Complex Structure

Microstructure, Properties and Corrosion Resistance of As-Cast&nbsp;Al-12Si-1.0Mn-0.6Mg-xSc Alloys

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Microstructure, Properties and Corrosion Resistance of As-Cast Al-12Si-1.0Mn-0.6Mg-xSc Alloys