A micro-model for aluminum-silicon alloys

Vijayaraghavan, Ravi; Palle, Nagendra; Boileau, James; Zindel, Jacob W.; Beals, Randy; Bradley, F.J.

doi:10.1016/1359-6462(96)00232-1

Cited by 17 publications

(11 citation statements)

References 4 publications

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“…T LIQ = 661 -4.97 Si -0.15 (Si) 2 -6.13 Cu -17.4 Mg + 2.72 Zn + 5.08CuMg (9) Unfortunately, equation (9) is valid only for the following ranges of chemical compositions (expressed in wt%); therefore, its applicability is limited: Si ≤ 9.30; Cu ≤ 2.50; Mg ≤ 0.60; Fe ≤ 1.15; Mn ≤ 0.40; Zn ≤ 0.63; Ni ≤ 0.43;Ti ≤ 0.05…”

Section: Literature Review Of Equations For the Calculation Of Characmentioning

confidence: 99%

“…In order to calculate the various thermo-physical and metallurgical parameters of solidifying aluminum casting alloys, the characteristic solidification temperatures of the alloy must be known with the highest possible degree of accuracy. Unfortunately, few equations are reported in the literature that relates the compositions of many commercially important hypoeutectic aluminum-silicon-copper series of alloys to their liquidus [8,9,10] and eutectic [11] temperatures.…”

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confidence: 99%

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Thermal description of hypoeutectic Al-Si-Cu alloys using silicon equivalency

Djurdjevic¹

2012

Vojnotehni?ki glasnik

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Section: Literature Review Of Equations For the Calculation Of Characmentioning

confidence: 99%

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confidence: 99%

Thermal description of hypoeutectic Al-Si-Cu alloys using silicon equivalency

Djurdjevic¹

2012

Vojnotehni?ki glasnik

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“…[1] , using multiple regression analysis of the experimental data: Unfortunately its applicability is limited because equation (9) The next equation for predicting T LIQ of aluminum alloys, for Al-Si-Cu systems, has been developed by Vijayaraghavan et al [2] . Using the data from the ternary Al-Si-Cu phase diagram and applying the multiple regressions analysis the following mathematical relation has been obtained:…”

Section: Figure 3 B) Effect Of Minor Alloying Elements On Si XImentioning

confidence: 99%

“…In order to calculate the various thermo-physical and metallurgical parameters of a solidifying aluminum casting alloys, the characteristic solidification temperatures of the alloy must be known with the highest degree of accuracy. Unfortunately, few equations are reported in the literature that relates the compositions of many commercial hypoeutectic aluminum-silicon series of alloys for their liquidus [1][2][3] and eutectic [4] temperatures.…”

Section: Introduction and Scopementioning

confidence: 99%

Description of hypoeutectic Al-Si-Cu alloys based on their known chemical compositions

Djurdjevic¹,

Vicario²

2013

REVMETAL

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The modeling of casting processes has remained a topic of active interest for several decades, and the availability of numerous software packages on the market is a good indication of the interest that the casting industry has in this field. Most of the data used in these software packages are directly read or estimated from the binary or multi-component phase diagrams. Unfortunately, except for binary diagrams, many of ternary or higher order phase diagrams are still not accurate enough. Having in mind that most of the aluminum binary systems are very well established, it has been tried to transfer multi-component system into one well known Al-Xi pseudo binary system (in this case the Al-Si phase diagram was chosen as a reference system). The new Silicon Equivalency (Si EQ ) algorithm expresses the amounts of major and minor alloying elements in the aluminum melts through an "equivalent" amount of silicon. Such a system could be used to calculate several thermo-physical and solidification characteristics of multi component as cast aluminum alloys. This provides to the model the capacity to predict the solidification characteristics of cast parts, where cooling rates are slow and the solidification process has to be known in great detail in order to avoid quality problems in the casting. This work demonstrates how the Si EQ algorithm can be used to calculate the characteristic solidification temperatures of the multicomponent Al-Si alloys as well as their latent heats and growth restriction factor. Statistical analysis of the results obtained for a wide range of alloy chemical compositions shows a very good correlation with the experimental data and the Si EQ calculations. The same mathematical approach might be applied for other metallic systems such as iron and magnesium, using carbon equivalency for ferrous systems and aluminum equivalency for magnesium multi-component alloys. KeywordsSilicon Equivalent (Si EQ ) algorithm; Aluminium solidification temperatures; Al-Si-Cu alloys. Descripción de las aleaciones hipoeutécticas Al-Si-Cu basada en su composición química ResumenLa modelización de los procesos de fundición ha sido un tópico de interés durante las últimas décadas, y la cantidad de programas de simulación existentes en el mercado es un buen indicador del interés de la industria en este campo. La mayoría de los datos empleados en estos programas se basan en los diagramas de fase binarios, ternarios o incluso superiores. Desafortunadamente, excepto para los diagramas binarios, el ajuste de los datos no es lo suficiente bueno. Teniendo en cuenta que la mayoría de los sistemas binarios del aluminio están bien definidos se ha intentado convertir los sistemas multi-componentes en un pseudo binario sistema Al-Xi (en este caso el diagrama de fase Al-Si es el elegido como sistema de referencia). El nuevo algoritmo del Silicio Equivalente (Si EQ ) expresa la cantidad de los elementos de la aleación que son mayoritarios y minoritarios, a través de una cantidad "equivalente" de silicio. Este sistema puede e...

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“…Temperature Gradient, G Generally there are two approaches to microstructure modeling [14,15]: microscopic and macro-microscopic modeling. Microscopic is more fundamental that uses nucleation and dendrite growth laws to estimate the evolution of fraction solid during the solidification process.…”

Section: Microstructurementioning

confidence: 99%

modeling of hot tearing in aluminium alloy /

Wu¹

2003

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Hot tearing is one of the "universal" defects in many aluminium casting products. The formation of hot tearing involves complex solidification phenomena and processing conditions. During the DC casting process, it often initiates at the surface and propagates towards centre. In the present work, a coupled solidification model (microstructure) and hot tearing model has been developed in order to predict the hot tearing susceptibility of aluminium alloys and thus to better control its occurrence.The microstructure modeling in this project was progressed from two-dimensional simulation of Al-4.5%Cu binary alloy solidification, and the modeling results were compared with the experimental data. The information provided by the microstructural model, such as temperature field, evolution of solid fraction, the final grain size and the microstructure morphology, is essential for the further study of hot tearing.In order to predict the hot tearing susceptibility during solidification, two hot tearing criteria with different aspects have been implemented into the microstructural model. The Lahaie Bouchard (LB) criterion is based on the mechanical response of the semi-solid body, while the Rappaz Drezet Grenaud (RDG) criterion considers the pressure drop from both thermal deformation and solidification shrinkage through the mushy zone.In the microstructure -hot tearing model using LB criterion, by combining the constitutive law that reflected the viscous behaviour and the critical fracture based on the capillary force, a critical strain can be calculated to identify when and where hot tearing 11 could occur. The critical strain is influenced by cooling condition, strain rate, solid fraction and alloy composition. The modeling results give an overall indication of the appearance of hot tearing, and can be used to investigate the susceptibility of hot tearing tendency influencing by the solidification parameters and the thermal properties of the Al-Cu alloys.To valid the coupled microstructure-hot tearing model, some experiments have been carried out on the Direct Chill Ingot Surface Simulator (DCSS). The displacements under applied tensile loads were measured and the occurrence of the hot tearing was observed.The results from modeling and experiments were compared and discussed. The complete microstructure -hot tearing model (with the LB criterion), corresponds with the facture stress range found in the experimental data. By further correction based on a recently modified constitutive model, the critical strain range between the modeling and experiment can give better agreement to identify the appropriate condition for the susceptibility of hot tearing.The modeling results from the RDG criterion showed that it is more suitable for the central type of hot tearing. It needs to be studied further to know whether this criterion is applicable for the surface hot tearing as in the case of DC cast sheet ingots. Ill ACKNOWLEDGEMENTSIt is with great pleasure that I acknowledge all those who were involved directly or indirectl...

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A micro-model for aluminum-silicon alloys

Cited by 17 publications

References 4 publications

Thermal description of hypoeutectic Al-Si-Cu alloys using silicon equivalency

Thermal description of hypoeutectic Al-Si-Cu alloys using silicon equivalency

Description of hypoeutectic Al-Si-Cu alloys based on their known chemical compositions

modeling of hot tearing in aluminium alloy /

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