The influence of Cr content on the microstructure and mechanical properties of AlSi9Cu3(Fe) die-casting alloys

Timelli, Giulio; Bonollo, Franco

doi:10.1016/j.msea.2010.08.079

Cited by 90 publications

(55 citation statements)

References 31 publications

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“…This result is closely related to the volume fraction of Fe-rich particles precipitated from liquid alloy, which depends on the SF. [22] A comparison of the DSC curves in Figure 3 also highlights the presence of peak 3, which corresponds to the formation of pro-eutectic Fe-rich particles, only visible in alloy B. This is mainly due to the chemical Table II. composition of this alloy, which exhibit the highest value of the Fe:Mn ratio (4.63).…”

Section: Resultsmentioning

confidence: 87%

“…[20] Fe, Mn, and Cr, the main source of which is recycled aluminum scrap, are normally present in secondary aluminum alloys as impurities. Fe, Mn, and Cr can substitute one another when present in a crystal structure that is body-centered cubic, a-Al 15 (Fe, Mn, Cr) 3 Si 2 ; the morphology of this may be Chinese script, star-like, or polyhedral [1,21,22] However, these complex intermetallic compounds have a high specific gravity and tend to segregate to the bottom of aluminum melts and holding furnaces and the intermetallics, generally called sludge, thus reduce the effective capacity of the furnace. [23][24][25][26] Since sludge crystals are hard and brittle compact inclusions, [27] they can also compromise machining operations and have a considerable effect on cutting tool life, and degrading the mechanical and physical properties of the component.…”

Section: Introductionmentioning

confidence: 99%

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On the Formation of Sludge Intermetallic Particles in Secondary Aluminum Alloys

Ferraro

Bjurenstedt

Seifeddine

2015

Metall Mater Trans A

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The primary precipitation of Fe-rich intermetallics in AlSi9Cu3(Fe) type alloys is studied for different Fe, Mn, and Cr contents and cooling rates. Differential scanning calorimetry, thermal analysis, and interrupted solidification with a rapid quenching technique were used in combination in order to assess the nucleation temperature of sludge particles, as well as to follow their evolution. The results revealed that the sludge nucleation temperature and the release of latent heat during sludge formation are functions of Fe, Mn, and Cr levels in the molten alloy (i.e., the sludge factor, SF) and cooling rate. Moreover, it can be concluded that sensitivity to sludge formation is not affected by cooling rate; i.e., a decrease in the SF will reduce sludge nucleation temperature to the same extent for a higher cooling rate as for a lower cooling rate. The sludge formation temperature detected will assist foundries in setting the optimal molten metal temperature for preventing sludge formation in holding furnaces and plunger systems.

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Section: Resultsmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

On the Formation of Sludge Intermetallic Particles in Secondary Aluminum Alloys

Ferraro

Bjurenstedt

Seifeddine

2015

Metall Mater Trans A

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“…It is largely known [15][16][17] that both manganese, the most diffuse alloying element, and chromium induce the precipitation of hard primary α-Al 15 (Fe,Mn,Cr) 3 Si 2 (α-Fe) particles (i.e., sludge [18]) instead of needle-like β-Fe phase. As reported in [19], the replacement of β-Fe with α-Fe phase leads to enhancement of wear resistance.…”

Section: Introductionmentioning

confidence: 99%

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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“…AlSi9Cu3(Fe) [8] alloy is mainly used in the automotive industry. It contains a relatively large amount of copper, which gives good mechanical and processing properties.…”

Section: Introductionmentioning

confidence: 99%

Dependence of mechanical properties on Cu content in AlSi9Cu3(Fe) alloy

et al. 2017

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Subject reviewAlSi9Cu3(Fe) aluminium alloy is one of the most commonly used casting aluminium alloys because their utility is based on good mechanical properties. Production often leads to deviations of maximum levels for certain alloying elements, particularly copper. Since mechanical properties of the final products of these alloys strongly depend on the concentration of copper in the alloy, various concentrations of copper were added to the basic alloy whereas the chemical composition was monitored using an optical emission spectrometer, measuring Brinell hardness and doing tensile tests. Moreover, the impacts of copper on oxidizing and corrosion resistance of the experimental alloys were analysed. The alloy with 3 wt. % Cu showed the best results. Keywords: Al-Si-Cu alloy; corrosion resistance; mechanical properties Ovisnost mehaničkih svojstva o sadržaju Cu u slitini AlSi9Cu3(Fe)Pregledni članak Legura aluminija AlSi9Cu3(Fe) je jedna od najčešće korištenih aluminijevih legura jer je njezina primjena temeljena na dobrim mehaničkim svojstvima. U proizvodnji često nastaju odstupanja od maksimalno dopuštenih granica pojedinih legirajućih elemenata, posebice bakra. Budući da mehanička svojstva gotovih proizvoda iz ovih legura ovise o sadržaju bakra, različiti udjeli bakra su dodavani osnovnoj leguri, a sadržaj kemijskih elemenata je praćen pomoću optičkog spektrometra, ispitivanja tvrdoće HB i mjerenja vlačne čvrstoće. Uz ova ispitivanja, analiziran je i utjecaj bakra na oksidacijska svojstva i korozijsku postojanost. Najbolji rezultati dobiveni su za 3 wt. % udjela Cu.

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The influence of Cr content on the microstructure and mechanical properties of AlSi9Cu3(Fe) die-casting alloys

Cited by 90 publications

References 31 publications

On the Formation of Sludge Intermetallic Particles in Secondary Aluminum Alloys

On the Formation of Sludge Intermetallic Particles in Secondary Aluminum Alloys

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

Dependence of mechanical properties on Cu content in AlSi9Cu3(Fe) alloy

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