The Influence of Fe, Mn and Cr Additions on the Formation of Iron‐Rich Intermetallic Phases in an Al‐Si Die‐Casting Alloy

Fabrizi, Alberto; Ferraro, Stefano; Timelli, Giulio

doi:10.1002/9781118888100.ch34

Cited by 7 publications

(2 citation statements)

References 18 publications

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“…Nanoindentation tests were performed on sludge particles to verify their individual specific hardness. As found in [36], the different contents of iron, manganese, and chromium in the experimental alloys lead to a variation of the chemical composition of the sludge particles and, potentially, their mechanical properties. Therefore, sludge particles in three alloys with different iron, manganese, and chromium levels (Alloys 1, 13, and 18) were analyzed.…”

Section: Hardness and Nanoindentationmentioning

confidence: 70%

“…It has been recently reported how the stoichiometry of the α-Fe compounds is α-Al 12 (Fe,Mn,Cr) 3 Si 2 [34]; these compounds were described by Mondolfo [35] as a solid solution of iron and chromium in the Al 15 Mn 3 Si 2 phase, where iron and chromium atoms can substitute manganese atoms, resulting in the final α-Al 15 (Fe,Mn,Cr) 3 Si 2 stoichiometry. Fabrizi et al [36] highlighted how the variability of the Fe, Mn, and Cr concentration in the α-Fe precipitates is related to the initial alloy composition.…”

Section: Influence Of High Temperature On the Microstructurementioning

confidence: 99%

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Design of Wear-Resistant Diecast AlSi9Cu3(Fe) Alloys for High-Temperature Components

Timelli

Fabrizi

Vezzù

et al. 2019

Metals

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Type AlSi9Cu3(Fe) alloy has been modified by alloying with iron, manganese, and chromium elements to develop wear-resistant diecast hypoeutectic Al-Si-Cu alloys that can be applied for high-temperature applications. Several alloys have been produced by varying iron, manganese, and chromium levels (0.80, 1.00, 1.20 wt.% for Fe; 0.25, 0.40, 0.55 wt.% for Mn, and 0.06, 0.10 wt.% for Cr). Brinell hardness measurements and pin-on-disk wear tests have been conducted from room temperature up to 200 • C. The microstructural changes that occurred with the different alloying levels have been quantitatively examined by metallographic and image analysis techniques. The results showed how the increasing content of the Fe, Mn, and Cr promoted the precipitation of both primary and secondary Fe-enriched particles, mainly with polyhedral, blocky, and star-like morphologies. These compounds showed high hardness that is not affected by chemical composition and morphology variation. At high temperatures, the diecast alloys always showed lower average hardness and wear resistance, especially at 200 • C; however, a greater amount of Fe-rich particles can compensate the alloy softening.

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Section: Hardness and Nanoindentationmentioning

confidence: 70%

Section: Influence Of High Temperature On the Microstructurementioning

confidence: 99%

Design of Wear-Resistant Diecast AlSi9Cu3(Fe) Alloys for High-Temperature Components

Timelli

Fabrizi

Vezzù

et al. 2019

Metals

Self Cite

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Precipitation of primary Fe-rich compounds in secondary AlSi9Cu3(Fe) alloys

Timelli

Capuzzi

Fabrizi

2015

J Therm Anal Calorim

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The precipitation of primary Fe-bearing compounds in a secondary AlSi9Cu3(Fe) alloy has been investigated over three levels of iron (0.80, 1.00, 1.20 mass%) and manganese (0.25, 0.40, 0.55 mass%), and two levels of chromium (0.06, 0.10 mass%), as well as different cooling rates (2, 10, 20 °C min-1). Differential scanning calorimetry and metallographic techniques have been used in order to quantitatively evaluate the nucleation temperature and the phase fraction of sludge particles. The temperature of sludge formation increases by increasing the initial concentrations of Fe, Mn and Cr, while an increase in the cooling rate shifts the sludge nucleation towards lower temperature. The amount of sludge particles increases progressively with the sludge factor but even more by decreasing the cooling rate. The combination of Fe, Mn and Cr levels, as well as cooling rate, allows to determine a threshold value that prevents the sludge formation. In the analysed range of composition and cooling conditions, functional equations have been developed in order to accurately predict the precipitation temperature and the phase fraction of sludge in AlSi9Cu3(Fe) die-casting alloys

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