Dendritic Segregation of Zn-Al Eutectoid Alloys

Peter, Ildiko; Agapie, Mirela; Varga, Béla

doi:10.3390/met8110924

Cited by 9 publications

(3 citation statements)

References 16 publications

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“…In general, it was understood that different eutectoid transformations took place at different cooling rates and consequently the formation of a different microstructure. Therefore, it is possible that the amount of critical fluid in the microstructure may vary as a result of off-balance solidification, which leads to a different solid-liquid interface [40]. As a result, at high cooling rates, due to rapid solidification, the shrinkage is trapped in the casting, and at slow cooling speeds the porosity is shifted towards the mold top region.…”

Section: Resultsmentioning

confidence: 99%

“…They found that the conditions that cause phase separation during eutectic and eutectoid transformation will determine the structural modifications of the alloy when the Al segregation occurs at the dendrite level. In addition, using thermal analysis, they found that the phase transformation temperatures and microstructure changes due to different cooling rates [40]. The cooling rate of the molten zinc is determined by the balance of thermal energy released from melt to mold wall [44].…”

Section: Resultsmentioning

confidence: 99%

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Prediction of shrinkage ratio of ZA 27 die casting alloy with artificial neural network, computer aided simulation and comparison with experimental studies

Kumruoğlu

2021

Scientia Iranica

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In the cast alloys with a long freezing range such as ZA-27, casting defects such as porosity and shrinkage will occur if casting variables are not controlled carefully. In this study, the effect of casting variables on shrinkage and micro-porosity defects in ZA-27 was investigated. The defects of casting were predicted with Artificial Neural Network algorithms. The cooling rate, solidification time, temperature, liquid phase, initial mold temperature, and %shrinkage were obtained from a series of simulation-experimental tests. The heat transfer coefficient of ZA-27 and graphite die was calculated as 2000 W/(m 2 K). In the samples poured into the mold heated at 350 °C, the minimum feeder shrinkage volume was observed. Locations of the chronic Hotspot and Shrinkage problem was estimated. It was observed that the casting heated to 150 °C had wide-deep shrinkage on the upper and lateral surfaces of the feeder. A good correlation was obtained between the modeling results of the ANN and the experimental results. Optimum ANNs were designed, trained, and tested to predict the shrinkage rate for various initial mold temperatures and physical conditions. Thanks to the sigmoid (sigmoaxon) function training, the most systematic modeling ANN set was revealed with 99% (Vol. 7.65% Shrinkage) prediction.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Prediction of shrinkage ratio of ZA 27 die casting alloy with artificial neural network, computer aided simulation and comparison with experimental studies

Kumruoğlu

2021

Scientia Iranica

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“…This may be due to the phenomenon of grain boundary segregation that occurs in the alloys during the extrusion process, resulting in the accumulation of Al elements at the grain boundaries. This phenomenon may have a negative impact on the mechanical properties of the alloy [29,32].…”

Section: Microstructure Of Alloys In the Extruded Statementioning

confidence: 99%

Effect of Al Content on the Microstructure and Properties of Zn-Al Solder Alloys

Zhai,

Wang,

Liu

et al. 2024

Metals

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Zn-Al alloy with the addition of Al (5–25 wt.%) was fabricated into as–cast and rod–shaped alloys. SEM/EDS and XRD technology were used to examine the impacts of the Al–element content on the alloys’ microstructure, mechanical characteristics, electrical conductivity, wetting ability, and corrosion resistance. The findings demonstrate how the Zn-Al alloy’s microstructure is dramatically altered by the different additions of the Al content. When the Al content reaches 15 wt.%, the eutectoid structures of the as–cast Zn-Al alloy are the finest, and the microhardness and tensile strength of the extruded–state alloy reach their maximum and exhibit the best corrosion resistance. The spreading area of the Zn-15Al solder alloy achieves its maximum on the 6061 Al plate, while it reaches its minimum on the T2 Cu plate. Furthermore, the electrical resistivity of the Zn-Al alloy continuously decreases as the Al content increases.

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Effect of Isothermal Treatment on Mechanical and Tribological Properties of Alloy Zn – 40% Al – 2% Cu – 2% Si

Savaşkan,

Hekimoğlu,

Azaklı

2023

Met Sci Heat Treat

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Dendritic Segregation of Zn-Al Eutectoid Alloys

Cited by 9 publications

References 16 publications

Prediction of shrinkage ratio of ZA 27 die casting alloy with artificial neural network, computer aided simulation and comparison with experimental studies

Prediction of shrinkage ratio of ZA 27 die casting alloy with artificial neural network, computer aided simulation and comparison with experimental studies

Effect of Al Content on the Microstructure and Properties of Zn-Al Solder Alloys

Effect of Isothermal Treatment on Mechanical and Tribological Properties of Alloy Zn – 40% Al – 2% Cu – 2% Si

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