Observation and Prediction of the Hot Tear Susceptibility of Ternary Al-Si-Mg Alloys

Easton, Mark; Wang, Hao; Grandfield, John; Davidson, Cameron; StJohn, David H.; Sweet, Lisa; Couper, Malcolm J.

doi:10.1007/s11661-012-1132-6

Cited by 72 publications

(41 citation statements)

References 52 publications

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“…6,15,39) Another important use would be as an input for understanding permeability that is an important parameter in hot tearing models. [40][41][42] …”

Section: Discussionmentioning

confidence: 99%

Grain Morphology of As-Cast Wrought Aluminium Alloys

2011

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Two of the most important microstructural features of alloys are the grain size and the secondary dendrite arm spacing (SDAS) and these two factors are shown to combine together to describe the grain morphology. Both grain refinement and the SDAS depend upon alloy composition through constitutional undercooling, but in different ways. It is shown that there is a 'characteristic' SDAS for each alloy at a particular cooling rate, and reducing the grain size causes the grain morphology to change from dendritic to cellular/rosette-like to globular or spherical. Increasing the cooling rate refines both the SDAS and the grain size, but reduces the SDAS more rapidly leading to finer, more dendritic grain structures. Particular ratios of grain size to SDAS are used to define each morphology and it is shown how these can assist with obtaining a required grain size and morphology through the use of solidification conditions and alloy chemistry.

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“…6,15,39) Another important use would be as an input for understanding permeability that is an important parameter in hot tearing models. [40][41][42] …”

Section: Discussionmentioning

confidence: 99%

Grain Morphology of As-Cast Wrought Aluminium Alloys

2011

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“…The alloys were grain refined using Al5Ti1B grain refiner additions at 0.05 pct Ti to produce samples with as-cast grain size similar to that found in direct chill (DC) cast alloys. [31] The detailed compositions of these alloys are shown in Table I. Unless otherwise specified, all compositions are expressed in weight percentage (wt pct).…”

Section: Experimental Methodsmentioning

confidence: 99%

The Effect of Iron Content on the Iron-Containing Intermetallic Phases in a Cast 6060 Aluminum Alloy

Sweet

Zhu

Gao

et al. 2011

Metall Mater Trans A

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The effect of iron content, ranging from 0.1 to 0.5 wt pct, on the formation of Fe-containing intermetallic phases in a cast 6060 aluminum alloy was investigated. Various characterization techniques, including optical microscopy, scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM) were used to examine the identity, morphology, and prevalence of the Fe-Al and Fe-Al-Si intermetallic phases. The predominant phase is found to be b-Al 5 FeSi at lower Fe levels, but this is replaced by a-AlFeSi (bcc structure) with increasing Fe content. The Fe containing intermetallic phases observed are compared to those predicted using the Scheil module of THERMO-CALC software, and the similarities and discrepancies are discussed.

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“…This can be achieved by grain refining techniques described in the literature. [60][61][62][63][64][65] Also, the grain refining produces slightly higher strength which increases the resistance against the mechanical strain. This also maximizes the mushy permeability based on the type of grain refiner which increases the resistance of interdendritic fluid flow in the early stages of solidification.…”

Section: A Mechanism Of Extruded Surface Segregation Layermentioning

confidence: 99%

Modeling of Heat Transfer and Interdendritic Strain for Exuded Surface Segregation Layer in the Direct Chill Casting of Aluminum Alloys

El-Bealy

2015

Metall Mater Trans B

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This investigation on the formation of exuded surface segregation layer ''ESSL'' is intended to provide experimental and simulated comparison to verify the model developed previously by El-Bealy. Preliminary verification and calibration of the previous 2D mathematical model are demonstrated by quantitative errors between the previous measurements and predictions of temperature and macrosegregation. Also, the results from these comparisons reveal that the errors are in the reasonable and within allowable limits. These comparisons lead to the fact that the exuded surface segregation layer mostly forms on the middle slice of broad sheet ingot face and in the early stages of mold zone. The model predictions point out also that the different interdendritic strain hypotheses associated with fluctuations of mold cooling conditions. This affects the interdendritic liquid flow between the equiaxed crystals which influences the severity of ESSL formation and its macrosegregation level. The mechanism of ESSL with heat flow and interdendritic strain generation has been analyzed and discussed. The quantitative comparisons between the pervious experimental results and numerical simulation in this investigation reveal also several solutions to prevent this defect for future work.

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Observation and Prediction of the Hot Tear Susceptibility of Ternary Al-Si-Mg Alloys

Cited by 72 publications

References 52 publications

Grain Morphology of As-Cast Wrought Aluminium Alloys

Grain Morphology of As-Cast Wrought Aluminium Alloys

The Effect of Iron Content on the Iron-Containing Intermetallic Phases in a Cast 6060 Aluminum Alloy

Modeling of Heat Transfer and Interdendritic Strain for Exuded Surface Segregation Layer in the Direct Chill Casting of Aluminum Alloys

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