Review of thermal analysis applications in aluminium casting plants

Djurdjevic, Mile B.; Vicario, Iban; Huber, G.

doi:10.3989/revmetalm.004

Cited by 18 publications

(22 citation statements)

References 6 publications

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“…While this approach is novel it still requires further development to account for various alloy chemistries as well as solidification rate conditions. [37,38] Liquidus temperature determination was not discussed in depth within this work, but it has been demonstrated that application of neutron diffraction brings additional insight on Si atoms clustering in the liquid that most likely took place few degrees above liquidus temperature. [23][24][25] Since quantification of individual phases, i.e., Si and Al during alloy solidification can't be determined accurately by thermal analysis (except by application of quenching experiments), neutron diffraction analysis can help at least partially.…”

Section: Summary and Discussionmentioning

confidence: 99%

“…This approach, which was not used in this study, was demonstrated by Mackay et al [36] for a-Al dendrite and Al-Si eutectic growth analysis in hypoeutectic Al-Si alloys. As far as quantification of phases is concerned, studies have been performed [37,38] where the cooling curve analysis was applied to calculate the total amounts of Cu and Mg based phases that precipitated at the final stages of the solidification process. The total area percentage of the Cu-Mg enriched phases was defined as the ratio of the area between the first derivative of the cooling curve and the hypothetical solidification path of the Al-Si-Cu eutectic to the total area between the first derivative of the cooling curve and the base line.…”

Section: Summary and Discussionmentioning

confidence: 99%

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In Situ Study of Microstructure Evolution in Solidification of Hypereutectic Al-Si Alloys with Application of Thermal Analysis and Neutron Diffraction

Sediako¹,

Kasprzak

2015

Metall Mater Trans A

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Understanding of the kinetics of solid-phase evolution in solidification of hypereutectic aluminum alloys is a key to control their as-cast microstructure and resultant mechanical properties, and in turn, to enhance the service characteristics of actual components. This study was performed to evaluate the solidification kinetics for three P-modified hypereutectic Al-19 pct Si alloys: namely, Al-Si binary alloy and with the subsequent addition of 2.8 pct Cu and 2.8 pct Cu + 0.7 pct Mg. Metallurgical evaluation included thermodynamic calculations of the solidification process using the FactSageä 6.2 software package, as well as experimental thermal analysis, and in situ neutron diffraction. The study revealed kinetics of solid a-Al, solid Si, Al 2 Cu, and Mg 2 Si evolution, as well as the individual effects of Cu and Mg alloying additions on the solidification path of the Al-Si system. Various techniques applied in this study resulted in some discrepancies in the results. For example, the FactSage computations, in general, resulted in 281 K to 286 K (8°C to 13°C) higher Al-Si eutectic temperatures than the ones recorded in the thermal analysis, which are also~278 K (~5°C) higher than those observed in the in situ neutron diffraction. None of the techniques can provide a definite value for the solidus temperature, as this is affected by the chosen calculation path [283 K to 303 K (10°C to 30°C) higher for equilibrium solidification vs non-equilibrium] for the FactSage analysis; and further complicated by evolution of secondary Al-Cu and Mg-Si phases that commenced at the end of solidification. An explanation of the discrepancies observed and complications associated with every technique applied is offered in the paper.

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Section: Summary and Discussionmentioning

confidence: 99%

Section: Summary and Discussionmentioning

confidence: 99%

In Situ Study of Microstructure Evolution in Solidification of Hypereutectic Al-Si Alloys with Application of Thermal Analysis and Neutron Diffraction

Sediako¹,

Kasprzak

2015

Metall Mater Trans A

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“…LabView software recorded changes in alloy temperature over time in a file. Based on the exact values of temperatures and time, specific values of temperatures for individual structural components of all observed alloys were determined [ 35 , 36 ].…”

Section: Methodsmentioning

confidence: 99%

Study of the Influence of Zirconium, Titanium and Strontium on the Properties and Microstructure of AlSi7Mg0.3Cu0.5 Alloy

et al. 2022

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The aim of the paper is to describe and specify the properties and microstructure of Al-Si alloy using Zr, a combination of Zr with elements used in the grafting of Al (Ti) alloys, and modification (Sr). Al-Si alloys with a combination of Zr and Ti and Sr elements represent an opportunity for the development of new aluminum alloys with a specific use. The experiment focused on the analysis of the synergistic effects of Zr with Ti and Zr with Sr on a AlSi7Mg0.3Cu0.5 alloy. The experimental alloys contained a constant Zr content of 0.15 wt. % and were alloyed with a gradual addition of Ti and Sr in the range of 0.1 to 0.3 wt. % for Ti, and 0.1 to 0.3 wt. % for Sr. The experimental samples were cast by meltable model casting technology. In variants with a constant addition of Zr 0.15 wt. % and a gradual addition of Ti, we observed an increase in the values of mechanical characteristics, with a significant decrease in ductility. When evaluating the structure of experimental alloys, Ti affected it by increasing the number of precipitated Zr phases. Experimental alloys with Zr and Sr addition were characterized by nucleation of Zr phases in angular morphology. It can be concluded that the investigated elements are expected to have a positive (strengthening) effect even at higher operating temperatures.

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“…In order to have a fine scale grain size, the most widely practiced method is to present effective nuclei in the liquid metal using Al-Ti-B grain refiners, which usually contain active seeds such as Al 3 Ti, TiB 2 , AlB 2 , or (Al,Ti)B 2 . Thermodynamic studies suggest that these latter particles convert to TiB 2 , so that the titanium diffuses into the (Al,Ti)B 2 particles while the aluminum diffuses out, resulting in the formation of TiB 2 [ 4 , 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of Grain Refining of Al-(7–17%) Si Cast Alloys Using Al-10% Ti and Al-4% B Master Alloys

Samuel

Songmené

et al. 2023

Materials

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The present article addresses solidification parameters, and includes analyses of the macrostructure and microstructure in the light of the results obtained from the thermal analysis, from which it is possible to conclude that undercooling (TS) and recalescence (TR) temperatures increase with the initial increase in titanium (Ti) concentration. If the concentration reaches approximately 0.25%, a rapid decrease in these temperatures is observed. Thereafter, the temperatures increase again with the further increase in Ti concentration, and eventually become constant. These temperatures also vary depending on the superheating and casting temperature. The ∆T parameter (i.e., TS − TR) decreases with the Ti concentration and, from a concentration of around 0.20% Ti, this parameter becomes zero. The grain size decreases with the Ti concentration. If the concentration exceeds about 0.20%, the grain size becomes the minimum. Another parameter to be considered is the interaction between the grain refiner and the traces of other metals in the base Al alloy. For example, Al-4%B can react with traces of Ti that may exist in the base alloy, leading to the reaction between boron (B) and Ti to form TiB2. Grain refinement is achieved primarily with TiB2 rather than AlB2, or both, depending on the Ti content in the given alloy.

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Review of thermal analysis applications in aluminium casting plants

Cited by 18 publications

References 6 publications

In Situ Study of Microstructure Evolution in Solidification of Hypereutectic Al-Si Alloys with Application of Thermal Analysis and Neutron Diffraction

In Situ Study of Microstructure Evolution in Solidification of Hypereutectic Al-Si Alloys with Application of Thermal Analysis and Neutron Diffraction

Study of the Influence of Zirconium, Titanium and Strontium on the Properties and Microstructure of AlSi7Mg0.3Cu0.5 Alloy

A Comparative Study of Grain Refining of Al-(7–17%) Si Cast Alloys Using Al-10% Ti and Al-4% B Master Alloys

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