Effects of Individual and Combined Additions of Pb, Bi, and Sn on the Microstructure and Mechanical Properties of Al-10.8Si-2.25Cu-0.3Mg Alloy

Mohamed, A.M.A.; Samuel, F. H.; Samuel, A. M.; Doty, H. W.

doi:10.1007/s11661-008-9692-1

Cited by 21 publications

(21 citation statements)

References 20 publications

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“…Recently, a few of them (tin and lead) have been recognized as significant and problematic for some aluminium alloys (Djurdjevic et al, 2012c;Emadi et al, 2008;Mohamed et al, 2009). Both elements are not dissolved in pure aluminum, and tin is only partly dissolved in pure copper.…”

Section: Impact Of Low Melting Point Elements On the Solidification Pmentioning

confidence: 99%

Review of thermal analysis applications in aluminium casting plants

Djurdjevic¹,

Vicario²,

Huber³

2014

REVMETAL

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SUMMARY:Thermal analysis has been applied as a quality control tool in aluminium casting plants for many years. Recently, it has been recognized that the cooling curve and its first derivative analysis offer parameters that can successfully be used in simulation software programs to improve simulation accuracy. The latest developments in cooling curve analysis are related to the application of higher order derivatives, showing that the thermal analysis technique can be applied to calculate the total amounts of different phases precipitated in the solidification process, including copper-rich eutectic. This paper gives a short overview of cooling curve applications in aluminium casting plants, and the impact of lead on solidification characteristic temperatures of AlSi6Cu4 alloy. RESUMEN:Revisión de las aplicaciones del análisis térmico en las plantas de fundición de aluminio. El análisis térmico ha sido usado como una herramienta de control de calidad desde hace tiempo en las plantas de fundición de aluminio. Recientemente ha sido reconocido que el análisis de la curva de enfriamiento y su primera derivada ofrecen algunos otros parámetros que pueden ser usados de manera exitosa en los programas de simulación para mejorar su precisión. Los nuevos desarrollos en el análisis de la curva de enfriamiento aplicando las derivadas de orden superior han mostrado que la técnica del análisis térmico puede aplicarse para calcular la cantidad de precipitados en el proceso de solidificación. Este artículo proporciona una pequeña revisión de la aplicación de la curva de enfriamiento en las plantas de fundición de aluminio y del efecto del plomo sobre las temperaturas características de solidificación de la aleación AlSi6Cu4.

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Section: Impact Of Low Melting Point Elements On the Solidification Pmentioning

confidence: 99%

Review of thermal analysis applications in aluminium casting plants

Djurdjevic¹,

Vicario²,

Huber³

2014

REVMETAL

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“…In addition, it has been reported that with 0•1% Bi addition, the modification effect of Sr was eliminated in A356 alloy (Cho and Loper 2000). Study on 319 alloy also indicated that the modification effect of strontium was found to diminish with Bi addition up to 0•225 wt.% Bi (El-Hadad et al 2004), whilst adding 0•5 wt.% Bi to the modified and grain-refined Al-10•8% Si alloy led to coarsening of the eutectic Si particles (Mohamed et al 2009).…”

Section: Introductionmentioning

confidence: 98%

Poisoning effect of bismuth on modification behaviour of strontium in LM25 alloy

et al. 2011

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Nucleation and growth, temperature measurements and microstructure observations of silicon phase are presented for strontium modified Al-7%Si (LM25) cast alloy treated with bismuth. The results show that addition of bismuth in strontium modified alloys may have a poisoning effect resulting in lost modification of the silicon phase. With increasing Bi/Sr ratio, thermal analysis measurements showed that the eutectic growth temperature increased remarkably to 573 • C and recalescence decreased to 0•2 • C and the morphology of silicon displayed the same flakelike structure as in the unmodified alloys. Microstructural observation showed that a minimum Bi/Sr ratio of 1•2 which is equivalent to a Sr/Bi ratio of 0•43 is required for effective strontium modification and neutralization of the poisoning effect of bismuth.

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“…Standard aluminum machining alloys are found within the 2xxx and 6xxx series alloys which contain lead (Pb), and, sometimes, bismuth (Bi) in order to improve the free-cutting behavior. The microstructure of these systems have previously been characterized by various experimental methods such as optical microscopy, scanning/transmission electron microscopy, microradiography, electron probe micro analysis, x-ray diffraction [3][4][5][6][7][8][9], calorimetry [9][10][11], and positron annihilation [12][13][14]. It has been shown that the alloying system consists of (i) low-melting element inclusions, (ii) hardness increasing precipitates, and (iii) aluminides [9].…”

Section: Introductionmentioning

confidence: 99%

A high temperature nanoindentation study of Al–Cu wrought alloy

Koch

Abad

Renhart

et al. 2015

Materials Science and Engineering: A

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a b s t r a c tAluminum-copper alloys are widely used because of their low density and good mechanical strength accomplished with precipitation hardening. The alloy Al-Cu-Mg-Pb (AA2030) has been investigated before and after aging, at room temperature and at high temperatures. The mechanical properties at room temperature have been studied by Brinell hardness tests. T4 and T6 stages of the alloy have been investigated by differential scanning calorimetry up to 450°C, showing the precipitation of different clusters. High temperature nanoindentation has been used to characterize the mechanical properties up to 460°C in order to obtain a better understanding of the local dominating deformation mechanism in the material. A continuous decrease in the hardness and Young's modulus was found with the increasing temperature. The strain rate sensitivity of the alloy increased with the temperature from 0.022 at RT, up to 0.16 at 460°C. The activation volume was constant (around 31-41 b 3 ) up to 240°C, beyond this point a large increase was observed up to 178 b 3 . The results were comparable with similar materials, and indicate thermally activated processes.

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Effects of Individual and Combined Additions of Pb, Bi, and Sn on the Microstructure and Mechanical Properties of Al-10.8Si-2.25Cu-0.3Mg Alloy

Cited by 21 publications

References 20 publications

Review of thermal analysis applications in aluminium casting plants

Review of thermal analysis applications in aluminium casting plants

Poisoning effect of bismuth on modification behaviour of strontium in LM25 alloy

A high temperature nanoindentation study of Al–Cu wrought alloy

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