Structural and mechanical properties of Al–Si alloys obtained by fast cooling of a levitated melt

Nikanorov, S. P.; Волков, М. П.; Гурин, В. Н.; Burenkov, Yu. A.; Derkachenko, L. I.; Kardashev, B. K.; Regel, L. L.; Wilcox, William R.

doi:10.1016/j.msea.2004.07.037

Cited by 120 publications

(55 citation statements)

References 7 publications

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“…In addition, they possess low thermal expansion coefficients, relatively good corrosion resistance and favourable mechanical properties. 43 Higher silicon content improves fluidity, feeding characteristics and hot cracking resistance 44 but may also lead to reduced density of the casting, 45 increase in porosity and surface roughness 46 and, above 11%, can reduce the wear resistance of the alloy. 47 Siparticle morphology and density can be altered through the addition of Sr. 30 Bai and Biswas 48 and Sarkar and Clarke 49 have stated that the silicon content has no influence on the friction coefficient of Al-Si alloys.…”

Section: Tribology Corrosion and Environmentsmentioning

confidence: 99%

Impact of intermetallic precipitates on the tribological and/or corrosion performance of cast aluminium alloys: a short review

Culliton¹,

Betts²,

Kennedy³

2013

International Journal of Cast Metals Research

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The role of various intermetallic precipitates (IMPs), or secondary phase particles, in governing the wear and corrosion performance characteristics of cast aluminium alloys is outlined in this brief review. Such alloys are especially important in transport applications where their low weight, low cost and recyclability make them very attractive. However, alloy wear and/or corrosion behaviour often limit their industrial application, and more work needs to be carried out to extend their use into other areas. Careful control of IMP nucleation and growth rates may be beneficial, especially in alloys exposed to corrosive environments. Silicon, copper and magnesium are all important elements for enhanced mechanical strength and tribological performance but often to the detriment of alloy corrosion resistance. Other elements such as iron may also play a significant role in deleterious IMP formation. Use of dispersoids based on novel (quasicrystals) seed alloys with similar lattice characteristics to the a-Al matrix may result in further exploitation of these alloys.

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Section: Tribology Corrosion and Environmentsmentioning

confidence: 99%

Impact of intermetallic precipitates on the tribological and/or corrosion performance of cast aluminium alloys: a short review

Culliton¹,

Betts²,

Kennedy³

2013

International Journal of Cast Metals Research

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“…[1][2][3][4][5] Si, which is very chip as a raw material, is good and desirable element in Al casting alloys because it decreases melting temperature, increases melt fluidity and reduces thermal expansion coefficient (related to the solidification contraction). 3,4) For these reasons, eutectic Al-Si alloys have excellent casting properties.…”

Section: Introductionmentioning

confidence: 99%

“…4) Moreover, the overall weight of the cast component adopting eutectic Al-Si alloys is very light because the density of the alloys decreases almost linearly with increasing Si content due to low density (2.33 g/cm 3 ) of Si. 5) Due to the high liquid solubility and the low solid solubility of Fe in Al-Si alloys, Fe has various ways to come into the molten these alloys and promotes to form various Fe-rich intermetallic phases such as Al 8 Fe 2 Si () and Al 5 FeSi (). [6][7][8] For these reasons, Fe is always present in commercial Al-Si alloys and has been regarded as the most harmful element degrading mechanical properties of these alloys.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Solidification Paths in Al-Si-Fe Ternary System and Experimental Verification: Part II. Fe-Containing Eutectic Al-Si Alloys

2011

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The effects of Fe content and cooling rate on the solidification path and formation behavior of the Al 5 FeSi () phase in Fe-containing eutectic Al-Si alloys were studied based on thermodynamic analysis and pertinent experiments. To predict solidification path in Fe-containing eutectic Al-Si alloys, the thermodynamic calculations in the Al-Si-Fe ternary system, including the high Fe region, were systematically performed using the Thermo-Calc program and updated database. To experimentally verify the predicted results, designed two eutectic Al-Si alloys with different Fe levels were solidified under slowly-and rapidly-cooled conditions, respectively. The cooling curves of the solidified alloys were recorded by thermal analysis. Microstructures of the casting samples were studied by the combined analyses of optical microscopy (OM) and scanning electron microscopy (SEM). For the slowly-cooled condition with the high Fe level, the primary phase was mainly formed by the quasi-peritectic reaction of L þ ! þ (656 C). For the rapidly-cooled condition with high Fe level, the primary phase was mainly formed by the reaction of L ! (583649 C).

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“…[1][2][3][4][5] However, excessive amounts of Fe in Al-Si alloys usually cause industry problems such as mechanical property degradation. Given that the solubility of Fe in liquid Al alloys is considerably high, it is understandable that this leads to the dissolution of Fe in the steel casting tools (e.g., ladles, degassing tubes and stirring lances) during the casting process.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Solidification Paths in Al-Si-Fe Ternary System and Experimental Verification: Part I. Fe-Containing Hypoeutectic Al-Si Alloys

2011

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The effects of Fe content and cooling rate on the solidification path and formation behavior of the Al 5 FeSi () phase in Fe-containing hypoeutectic Al-Si alloys were studied based on thermodynamic analysis and pertinent experiments. The thermodynamic calculations were performed using the Thermo-Calc program. For analyses in the high alloy region of the Al-Si-Fe ternary system, a thermodynamic database for Thermo-Calc was correctly updated and revised by the collected up-to-date references. For thermodynamics-based predictions of the solidification path in Fe-containing hypoeutectic Al-Si alloys, liquidus projection (including various invariant, monovariant, and bivariant reactions and isotherms) and equilibrium phase fraction were calculated as functions of composition and temperature in the Al-Si-Fe ternary system. The calculated results were compared to experimental results using various casting runs. In order to analyze the solidification path as a function of Fe content, two representative hypoeutectic Al-Si alloys with different Fe levels were designed. To better understand the influence of cooling rate on the formation behavior of the phase, the two alloys were solidified under slowly-and rapidly-cooled conditions, respectively. The cooling curves of the solidified alloys were recorded by thermal analysis and various important solidification events were detected using the first derivative of the cooling curves. Microstructures of the casting samples were studied by combined analyses of optical microscopy (OM) and scanning electron microscopy (SEM). For the slowly-cooled condition with the high Fe level, the primary phase enveloping the Al 8 Fe 2 Si () phase was mainly formed by the quasi-peritectic reaction of L + ! (Al) + (612 C). For the rapidly-cooled condition with the high Fe level, the primary phase with morphology of a curved needle was mainly formed by the reaction of L ! (Al) + (579612 C).

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Structural and mechanical properties of Al–Si alloys obtained by fast cooling of a levitated melt

Cited by 120 publications

References 7 publications

Impact of intermetallic precipitates on the tribological and/or corrosion performance of cast aluminium alloys: a short review

Impact of intermetallic precipitates on the tribological and/or corrosion performance of cast aluminium alloys: a short review

Prediction of Solidification Paths in Al-Si-Fe Ternary System and Experimental Verification: Part II. Fe-Containing Eutectic Al-Si Alloys

Prediction of Solidification Paths in Al-Si-Fe Ternary System and Experimental Verification: Part I. Fe-Containing Hypoeutectic Al-Si Alloys

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