Effects of microstructure and casting defects on the fatigue behavior of the high-pressure die-cast AlSi9Cu3(Fe) alloy

Lattanzi, Lucia; Fabrizi, Alberto; Fortini, Annalisa; Merlin, Mattia; Timelli, Giulio

doi:10.1016/j.prostr.2017.11.119

Cited by 30 publications

(11 citation statements)

References 9 publications

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“…There are a large number of deep slip bands left by the dislocation slip surrounding fractured silicon phases, Figure 4b. Thus, tensile fracture of the alloy is caused by the fracture of eutectic silicon phase, which agrees with findings of other investigations [13]. When tensile strain is applied on the material, the matrix deforms and dislocations slip and are trapped by the silicon phases.…”

Section: Crack Initiationsupporting

confidence: 91%

“…A large number of casting defects are unavoidable in the aluminum alloy prepared with recycled alloy, in which gas pore and shrinkage pore are common defects of the recycled aluminium alloys. Gas pores are, typically, spherical, whereas shrinkage pores have an irregular three-dimensional shape [12,13]. Fatigue cracks were preferably initiated from pores and particles, which were just intercepted at their top with the sample surface or just buried beneath the surface.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and fracture behavior of Al‐Si‐Mg alloy prepared with recycled alloy

Song

Liu

Nie

et al. 2019

Materialwissenschaft Werkst

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In this paper, microstructure and fracture behavior of Al‐Si‐Mg alloy prepared with recycled alloy were studied. The results show that some casting defects such as oxidation slags, pores and iron‐rich intermetallic phases exist in the alloy prepared with recycled alloy. Stress concentration forms in the tips of the pores and iron‐rich intermetallic phases in the process of stretching. Cracks are easy to initiate near slags due to the weakening of the adhesion between the oxidized slag and the aluminum matrix. In addition, silicon phases play a hindering role on the movement of dislocations in the process of crack propagation and merging of cracks which is strengthening the alloy prepared with recycled alloy to some extent. Crack propagation is mainly along the direction of casting defects, and the cracks connect with each other until failure of material. Moreover, the crack originate from silicon phase and extend along the eutectic structure of alloy no‐containing recycled alloy, and a large plastic deformation occurred in the α‐aluminum dendrites.

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Section: Crack Initiationsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Microstructure and fracture behavior of Al‐Si‐Mg alloy prepared with recycled alloy

Song

Liu

Nie

et al. 2019

Materialwissenschaft Werkst

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“…Fe-rich α-Al 15 (Fe,Mn) 3 Si 2 , β-Al 5 FeSi, and α-Al 15 (Fe,Mn,Cr) 3 Si 2 , Cu-rich ϴ-Al 2 Cu, and Al 5 Mg 8 Cu 2 Si 6 and π-Al 5 Si 6 Mg 8 Fe 2 are intermetallic compounds that may be formed in AlSi 9 Cu 3 alloys. 50–54 In this study, α-Al 15 (Fe,Mn) 3 Si 2 in the shape of the skeleton (Chinese script) and Al 15 (Fe,Mn,Cr) 3 Si 2 with polyhedral shape (sludge) (Figures 8 and 9) were formed in the microstructures of the samples. These Fe-rich compounds formed in AlSi 9 Cu 3 alloy were proved by XRD (Figures 10 and 11) and EDX analysis (Table 2).…”

Section: Resultsmentioning

confidence: 51%

Microstructure and mechanical properties of Al–Si–Cu–Fe alloy-based ceramic particle-reinforced nanocomposites and microcomposites and a modified model to predict the yield strength of nanocomposites

Diler

2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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The effects of volume fraction, size, and type of reinforcement particles on the microstructure and mechanical properties of Al–Si–Cu–(Fe) alloy matrix composites were investigated and an analytical model was modified to predict the yield strength of the particle-reinforced nanocomposites. Nano- and micro-particle-reinforced Al–Si–Cu-(Fe) matrix composites (N-AMCs and M-AMCs) were manufactured by adding two different types and sizes of reinforcement particles to Al–Si–Cu–(Fe) alloys at different volume fractions using a two-step stir casting method combined with a high-energy ball milling process and a high-pressure die-casting method. Microstructural analyzes of N-AMCs and M-AMCs were performed using SEM, EDX, and XRD. The Brinell hardness test and the tensile test were carried out to determine the mechanical properties of the N-AMCs and M-AMCs. The hardness of the N-AMCs and M-AMCs was continuously enhanced by increasing the volume fraction of the reinforcement particles, while the yield strength and ultimate tensile strength of the N-AMCs and M-AMCs were improved up to 1.5 vol.% and 4 vol.% of nano-particles and micro-particles, respectively. An analytical model was modified to predict the yield strength of N-AMCs by integrating the effective volume ratio of nano-particles into each strengthening mechanism. The results predicted by the modified model reached nearly 98% agreement with the experimental results up to 1.5 vol.% of the reinforcement particles. Nano-particles had a much greater effect on strengthening mechanisms compared to micro-particles.

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“…High pressure die casting (HPDC) is a kind of casting technology providing a modern metal processing, which combines the before mentioned requirements and benefits. However, HPDC products are affected by different kind of defects such as gas pores, shrinkages and oxides [1]. These defects form due to the high-speed injection under high pressures that are resulting in high turbulence during mold filling [2].…”

Section: Introductionmentioning

confidence: 99%

The investigation of artificial and natural defects on the fatigue strength of vacuum-assisted high pressure die cast AlSi9Cu3(Fe) aluminum alloy

Szalva¹,

Orbulov²

2021

Preprint

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AlSi9Cu3(Fe) vacuum-assisted high pressure die cast (VPDC) specimens were investigated by experimental fatigue test and fracture mechanics approach. The aims of the investigations were (i) to evaluate the fracture resistance and (ii) to indirectly determine the threshold stress intensity value (ΔKth) of casting alloy in uniaxial tension. The specimens were sorted into two groups: specimens with different size (0.01-0.40 mm2) natural defects, and specimens an additional artificial blind hole. The fatigue strength region was tested at R=-1 stress ratio to 107 number of cycles to fracture. The fracture mechanics approach was applied to study the behavior of the small cracks by Kitagawa diagram, the defect size was taken into account by the Murakami’s (√area) parameter. The fatigue strength values were 104.7 MPa for smooth specimen, 92.7 MPa for specimen with D0.3 artificial hole, and 87.2 MPa for specimen with D0.6 artificial hole at the prescribed cycles, respectively.

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Effects of microstructure and casting defects on the fatigue behavior of the high-pressure die-cast AlSi9Cu3(Fe) alloy

Cited by 30 publications

References 9 publications

Microstructure and fracture behavior of Al‐Si‐Mg alloy prepared with recycled alloy

Microstructure and fracture behavior of Al‐Si‐Mg alloy prepared with recycled alloy

Microstructure and mechanical properties of Al–Si–Cu–Fe alloy-based ceramic particle-reinforced nanocomposites and microcomposites and a modified model to predict the yield strength of nanocomposites

The investigation of artificial and natural defects on the fatigue strength of vacuum-assisted high pressure die cast AlSi9Cu3(Fe) aluminum alloy

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