Correlation of solidification microstructure refining scale, Mg composition and heat treatment conditions with mechanical properties in Al-7Si-Mg cast aluminum alloys

Chen, Rui; Xu, Qingyan; Guo, Huiting; Xia, Zhiyuan; Wu, Qinfang; Liu, Baicheng

doi:10.1016/j.msea.2016.12.051

Cited by 71 publications

(50 citation statements)

References 40 publications

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“…This hardening occurs through the formation of barriers that hinder the movement of dislocations. It is highlighted that the Al-(5 to 12)wt%Si casting alloys with addition of magnesium ranging from 0.2 to 0.5 wt% allows the hardening of the matrix by precipitation of second phases, with emphasis to the Mg 2 Si phase, after solution and artificial aging heat treatments [29][30][31][32] .…”

Section: Introductionmentioning

confidence: 99%

“…, whose exponent (-2/3) has been validated by several experimental investigations on unsteady-state directional solidification of aluminum-based binary and multicomponent alloys, for both horizontal and vertical directions 2,16,17,23,[25][26][27][28]38,39 . Among the works on transient solidification, it is emphasized those reported for binary Al-Si 2,38,39 and multicomponent Al-Si-(Cu and Mg) 23,[25][26][27][28]30 alloys.…”

Section: Introductionmentioning

confidence: 99%

“…The composition of Al-Si alloys is determined by the amount of iron impurity present. It is emphasized that iron (Fe) levels generally vary from 0.04% (best primary metal) to 0.50% (secondary metal), with typical primary levels in the 0.1 to 0.2% range 30,32 . In this sense, the formation of Fe-intermetallic phases during the solidification of Al-Si alloys is inevitable, as can be seen by the solidification paths of Al7Si0.15Fe and Al7Si0.3Mg0.15Fe alloys shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

“…Chen et al 30 have proposed a study on the interconnection between solidification microstructures with T6 heat treatment, whose results showed that more refined dendritic microstructures, i.e., smaller secondary dendritic spacings inherited greater yield strength (σ YS ) and ultimate tensile strength (σ UTS ) after heat treatment. These authors have proposed to the literature for the as-cast Al-7wt%Si-0.3wt%Mg alloy the following mathematical equations: σ YS = 0.0041(λ 2 ) 2 +0.118(λ 2 ) + 111.1 and σ UTS = 0.029(λ 2 ) 2 +1.72(λ 2 ) + 155.8.…”

Section: Introductionmentioning

confidence: 99%

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Relationship Between Aluminum-Rich/Intermetallic Phases and Microhardness of a Horizontally Solidified AlSiMgFe Alloy

et al. 2018

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An experimental study with an A356-AlSiMgFe alloy was developed to evaluate the microhardness performance in the microstructure resulting of an unsteady-state horizontal solidification process. The Al-7wt%Si-0.3wt%Mg-0.15wt%Fe alloy was elaborated and directionally solidified in a water-cooled horizontal solidification device. In order to experimentally determine the cooling and growth rates (V L and T R , respectively), a thermal analysis was also conducted during solidification. Microstructural characterization by optical microscopy, SEM/EDS elemental mapping and microanalysis of the punctual EDS compositions allowed to observe the presence of an Al-rich dendritic phase (Al (α)) with interdendritic phases second composed of an eutectic mixture: Al (α-eutectic) + Si + Al 8 Mg 3 FeSi 6(π) + Mg 2 Si (θ). Furthermore, the dendritic microstructure was characterized by measuring the secondary dendritic spacings (λ 2) along the horizontally solidified ingot. Higher HV values were observed within the eutectic mixture.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Relationship Between Aluminum-Rich/Intermetallic Phases and Microhardness of a Horizontally Solidified AlSiMgFe Alloy

et al. 2018

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“…Heat treatment can not only improve the corrosion resistance of the alloy, but also improve the microhardness of the alloy. Chen et al [7] reported that both long-term solution treatment and short-term aging treatment would reduce the volume fraction of the hard phase precipitated in Al-7Si-Mg alloy after T6 heat treatment, thereby reducing the hardness of the alloy. Barbosa et al [8] reported that the microhardness of Al7Si0.3Mg alloy increases with increasing aging time.…”

Section: Introductionmentioning

confidence: 99%

Effect of (Pr + Ce) addition and T6 heat treatment on microhardness and corrosion of AlSi5Cu1Mg alloy

Zou

Yan

et al. 2020

Mater. Res. Express

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The effects of T6 heat treatment and 0.6 wt% (Pr+Ce) addition on microstructure, microhardness, and corrosion of AlSi5Cu1Mg alloy were investigated. Optical microscopy and scanning electron microscopy revealed that the T6 heat treatment and the addition of 0.6 wt% (Pr+Ce) effectively refined the α-Al and eutectic Si phases, which were uniformly distributed with Al 2 Cu phase in the alloy. Microhardness, weight loss, hydrogen evolution, Tafel polarization, and EIS tests showed that the combination of T6 heat treatment and 0.6 wt% (Pr+Ce) addition resulted in the best corrosion resistance and microhardness of the alloy. The microhardness of the AlSi5Cu1Mg+0.6 wt% (Pr+Ce)/T6 (115 HV) was 27.8% higher than that of the matrix (90 HV). At the same time, the corrosion current density of the alloy also reached the minimum value (38.4 μA cm −2 ). The T6 heat treatment and the addition of (Pr+Ce) can significantly decrease the average grain size, change the redistribution of the precipitated Al 2 Cu phase, refine the Si phase, and increase the pitting formation position, thus reducing the sensitivity of exfoliation corrosion.

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The Roles of Ni and Co in Dendritic Growth and Tensile Properties of Fe‐Containing Al–Si–Cu–Zn Scraps under Slow and Fast Solidification Cooling

et al. 2021

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Studies of Fe‐contaminated Al‐based scraps have drawn attention for years. However, little has been researched about the effects of cobalt (Co) and nickel (Ni) additions to contaminated scraps both under slow solidification (directional solidification, DS) and fast solidification regime (copper mold centrifugal casting, CC). As such, the current study examines a representative low‐alloy Al–Si chemistry from industrial scraps, i.e., the Al–7%Si–0.6%Fe–0.35%Cu–0.25%Zn (% by weight). This alloy is changed independently using Ni and Co. It is observed that a mixture of uneven distributed α and β Fe‐bearing particles prevails for all tested alloys and solidification conditions. The coexistence of both phases agrees with the charts proposed by Gorny's work for the range of secondary dendritic spacing, λ 2, observed. Although the Fe‐containing particles are smaller for fast‐solidified samples, they still maintain the acute morphology and, in some cases, the Chinese script shape. This results in a reduction in ductility of the order of 65% for the nonmodified and Ni‐modified samples considering mean λ 2 varying from 20 μm (DS) to 6.5 μm (CC), despite improvements in mechanical strength. Furthermore, addition of Co results in a higher number of Fe‐based particles within the microstructure. In this case, the largest particle/α‐Al interfacial area results in slightly poor ductility (~6–8%) and higher strength (175–205 MPa), with less ductility loss when DS and CC samples are compared.

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Correlation of solidification microstructure refining scale, Mg composition and heat treatment conditions with mechanical properties in Al-7Si-Mg cast aluminum alloys

Cited by 71 publications

References 40 publications

Relationship Between Aluminum-Rich/Intermetallic Phases and Microhardness of a Horizontally Solidified AlSiMgFe Alloy

Relationship Between Aluminum-Rich/Intermetallic Phases and Microhardness of a Horizontally Solidified AlSiMgFe Alloy

Effect of (Pr + Ce) addition and T6 heat treatment on microhardness and corrosion of AlSi5Cu1Mg alloy

The Roles of Ni and Co in Dendritic Growth and Tensile Properties of Fe‐Containing Al–Si–Cu–Zn Scraps under Slow and Fast Solidification Cooling

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