Interactive effects of grain refinement, eutectic modification and solidification rate on tensile properties of Al-10Si alloy

Riestra, Martin; Ghassemali, Ehsan; Bogdanoff, Toni; Seifeddine, Salem

doi:10.1016/j.msea.2017.07.074

Cited by 44 publications

(15 citation statements)

References 37 publications

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“…The Al-Ti-B master alloys are effective nucleating agents for Al-Si alloys. By adding Al-5Ti-B master alloys, Riestra et al [11] found that the Al 3 Ti and TiB 2 particles were formed and primary α-Al was refined. After adding 0.15wt.% B, Wu et al [12] found that α-Al dendrites were significantly refined.…”

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confidence: 99%

Effect of Ca addition on solidification microstructure of hypoeutectic Al-Si casting alloys

et al. 2019

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The effect of Ca addition on the solidification microstructure of hypoeutectic Al-Si casting alloys was investigated using scanning electron microscopy (SEM) and differential scanning calorimetry (DSC) methods with particular attention focused on the change of morphologies of primary α-Al and eutectic silicon. Meanwhile, solute distribution in solid-liquid was simulated according to Scheil-Gulliver law. Results showed that primary α-Al and eutectic silicon were refined as Ca content increased because of the variation of the solute concentration in liquid. The addition of Ca increased the nucleation sites like Al 3 Ti or Al 2 Cu to promote the nucleation of primary α-Al. Affected by modification effect of Ca, the shape of eutectic silicon changed from flake to fibrous structure. In addition, coarse plate Ca-rich phases could be found along the grain boundary with high Ca content.

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confidence: 99%

Effect of Ca addition on solidification microstructure of hypoeutectic Al-Si casting alloys

et al. 2019

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“…These, and other studies such as that of Xu et al, have highlighted potential new approaches in grain refinement, e.g., scandium addition [80]. Beyond a switch to new refining and modifying agents, combinations of both processes may also be considered [81], the more so since the present study has shown that Sr-and B-based modification on the one hand and TiB 2 -based grain refinement have opposed effects on foam expansion, Thus, combinations might partially cancel out negative side effects of Sr-and B-based treatments. In general, eutectic modification should in itself not be neglected-specifically if solutions can be identified with less detrimental effect on foam expansion.…”

Section: Discussionmentioning

confidence: 95%

Effects of Eutectic Modification and Grain Refinement on Microstructure and Properties of PM AlSi7 Metallic Foams

Lehmhus

Hünert

Mosler

et al. 2019

Metals

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For AlSi7 foams, microstructure modification by variation of solidification rates and addition of Sr, B and TiB2/TiAl3 was investigated and its transfer to powder metallurgical metal foaming processes demonstrated. Microstructural characterization focused on grain size and morphology of the eutectic phase. Cooling rates during solidification were linked to secondary dendrite arm spacing, establishing a microstructure-based measure of solidification rates. Effects of refining and modification treatments were compared and their influence on foam expansion evaluated. Studies on foams focused on comparison of micro- and pore structure using metallographic techniques as well as computed tomography in combination with image analysis. Reference samples without additives and untreated as well as annealed TiH2 as foaming agent allowed evaluation of pore and microstructure impact on mechanical performance. Evaluation of expansion and pore structure revealed detrimental effects of Sr and B additions, limiting the evaluation of mechanical performance to the TiB2 samples. These, as well as the two reference series samples, were subjected to quasi-static compression testing. Stress-strain curves were gained and density-dependent expressions of ultimate compressive strength, plateau strength and tangent modulus derived. Weibull evaluation of density-normalized mechanical properties revealed a significant influence of grain size on the Weibull modulus at densities below 0.4 g/cm3.

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“…This slurry displays a thixotropic behavior with liquid-like properties when shear stresses are applied, e.g., during die-filling, and to cast complex shaped castings with less defects compared to coarser microstructures. The addition of grain refiners to commercial aluminium alloys is a common practice in foundries and a significant number of studies can be found in the literature focused on the Al-5Ti-1B [7,[34][35][36] and Al-B [37][38][39] grain refiner systems. However, the effect of grain refiner addition during solidification of an alloy while stirring is applied has not received much attention in the literature.…”

Section: A Grain Formationmentioning

confidence: 99%

Influence of Grain Refinement on Slurry Formation and Surface Segregation in Semi-solid Al-7Si-0.3Mg Castings

Santos

Kallien

Jarfors

et al. 2018

Metall Mater Trans A

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This study aims to evaluate the effect of grain refinement on slurry formation and surface segregation in semi-solid castings produced by the Rheometalä process. The effect of two grain refiners, Al-8B and Al-5Ti-1B, on the slurry a-Al grain size, shape factor and solid fraction was evaluated. The results suggest that the addition of a grain refiner can affect the solid fraction obtained in the Rheometal TM process and, consequently, reduce the solute content near the casting surface. Grain refiner addition resulted in a larger fraction of a-Al grains £ 60 lm for the refined alloys compared with the unrefined alloy. Additionally, the growth of a-Al slurry globules was greater for the unrefined alloy compared with the refined alloy during solidification in the die-cavity. A more homogeneous and finer microstructure was observed near the surface in the grain-refined castings compared with the unrefined castings. Evidence of significant liquid penetration was identified in some a-Al globules, indicating that disintegration of a-Al globules may occur during the Rheometalä casting process.

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Interactive effects of grain refinement, eutectic modification and solidification rate on tensile properties of Al-10Si alloy

Cited by 44 publications

References 37 publications

Effect of Ca addition on solidification microstructure of hypoeutectic Al-Si casting alloys

Effect of Ca addition on solidification microstructure of hypoeutectic Al-Si casting alloys

Effects of Eutectic Modification and Grain Refinement on Microstructure and Properties of PM AlSi7 Metallic Foams

Influence of Grain Refinement on Slurry Formation and Surface Segregation in Semi-solid Al-7Si-0.3Mg Castings

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