Detection of Dendrite Coherency Temperature of Aluminum Alloys Using Single Thermocouple Technique

Djurdjevic, Mile B.; Odanović, Zoran; Zak, Hennadiy

doi:10.3139/147.110147

Cited by 7 publications

(14 citation statements)

References 4 publications

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“…The available literature provides a few others methods that have been used to detect this parameter. Jiang et al (1999), Djurdjevic et al (2012a) and Djurdjevic et al (2001b) used one (Tc) thermocouple located in the centre of the TA cup to determine the DCP temperature characteristics. The DCP is defined as the minimum point on the second derivative curve.…”

Section: Dendrite Coherency Temperaturementioning

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: Dendrite Coherency Temperaturementioning

confidence: 99%

Review of thermal analysis applications in aluminium casting plants

Djurdjevic¹,

Vicario²,

Huber³

2014

REVMETAL

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“…In addition, Cu reduces the corrosion resistance of aluminum alloys, and in certain alloys increases stress corrosion susceptibility. This element is generally responsible for reducing the casting characteristics, especially the feeding ability of Al-Si-Cu alloys [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…There is a lack of data, in the available literature, regarding quantification of feeding regions. The objective of this work is to examine how variation in chemical composition of Al- (5,7,9) Si-(0-4)Cu (wt.%) alloy may affect its characteristic solidification temperatures and corresponding fraction solid related to each temperature, as well as to quantify the effect of various contents of Si and Cu on the corresponding feeding regions. This analysis should help foundry professionals to understand better which feeding regions are more responsible for the formation of shrinkage porosity.…”

Section: Introductionmentioning

confidence: 99%

Quantification of Feeding Regions of Hypoeutectic Al-(5, 7, 9)Si-(0-4)Cu (wt.%) Alloys Using Cooling Curve Analysis

Huber¹,

Djurdjevic²,

Manasijević³

2020

Mass Production Processes

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This chapter presents the potential of the cooling curve analysis to characterize the solidification path of the cast hypoeutectic series of Al-Si-Cu alloys and to quantify their feeding regions. The aim of this work is to examine how variations in the chemical composition of Si (5, 7 and 9 wt.%) and Cu (from 0 to 4 wt.%) might affect the characteristic solidification temperatures, their corresponding fraction solid, and feeding regions of investigated alloys. These parameters collected from the cooling curve analysis can be used for better understanding of the solidification paths of Al-Si-Cu alloys and could easily be incorporated into existing simulation software packages to improve their accuracy.

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“…[29][30][31] Under unmodified conditions (Sr near residual, e.g. (20 ppm), the Al-Si begins to nucleate from the dendrite surfaces and the Al-Si solid/ liquid interface advances into interdendritic regions.…”

Section: Introductionmentioning

confidence: 99%

Effect of Si and Cu concentrations and solidification rate on soundness in casting structure in Al–Si–Cu alloys

Mackay

Sokolowski

2010

International Journal of Cast Metals Research

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Recent metal casting literature has focused on the effect of Al melt practices and alloy chemistry on the formation of dispersed microshrinkage porosity in the cross-section of sand castings. In the present work, an attempt is made to explain observations on the severity of microshrinkage porosity formation in wedge castings of four alloys having different Si and Cu concentrations, with cooling rates ranging from 0?75 down to 0?045 uC s 21 . The Al-9Si-1Cu alloy provided the lowest level of dispersed microshrinkage along the wedge and the Al-7Si-4Cu alloy had the highest porosity. It is concluded on the basis of interpretative thermal analysis with fraction solid calculation that the requirements for the lowest level of porosity are primary a-Al dendritic mass being low in volume and more permeable, a high volume of Al-Si eutectic phase but within a shorter freezing range, and a low volume fraction of the Cu and Mg containing phases post-Al-Si eutectic reactions.

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Detection of Dendrite Coherency Temperature of Aluminum Alloys Using Single Thermocouple Technique

Cited by 7 publications

References 4 publications

Review of thermal analysis applications in aluminium casting plants

Review of thermal analysis applications in aluminium casting plants

Quantification of Feeding Regions of Hypoeutectic Al-(5, 7, 9)Si-(0-4)Cu (wt.%) Alloys Using Cooling Curve Analysis

Effect of Si and Cu concentrations and solidification rate on soundness in casting structure in Al–Si–Cu alloys

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