The Effect of the Cooling Rate on the Microstructure and Microsegregation: An Experimental and Numerical Investigation of Solidification in Hypoperitectic Cu − 20 wt.% Sn Alloy

Paradela, Késsia Gomes; Garção, Wysllan Jefferson Lima; Baptista, Luis Antônio de Souza; Sales, Roberto Carlos; Oliveira, Vânia Cristina de; Ferreira, Alexandre Furtado

doi:10.1590/1980-5373-mr-2020-0110

Cited by 3 publications

(3 citation statements)

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“…According to Meza et al 14 and Paradela et al 15 , the calculated results for microsegregation using the theoretical models (e.g., Scheil and Clyne-Kurz models) can yield discrepancies from the experimental data. In present work, we considered an experimental equation, in order to predict the Fe microsegregation.…”

Section: Methodsmentioning

confidence: 99%

“…δ is the thickness of the diffusion boundary layer ahead the solidification interface and D L represents Fe diffusivity in the liquid region. δ depends on the solidification speed (S S ), the liquid viscosity and agitation conditions ahead the solidification interface, and its value can vary from 10 −6 to 10 −3 m, Paradela et al 15 .…”

Section: Methodsmentioning

confidence: 99%

“…Researches involving unidirectional solidification under transient heat flow for pure metals and their alloys have come into attention [4][5][6][7][8][9][10][11][12][13][14][15] . This technique allows the investigation of the solid/liquid surface morphology, microstructure and microsegregation as a function of the thermal parameters, which is very attractive for investigating the influence of these parameters in solidification of metals and alloys.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural Patterns, Microsegregation, Porosity, and Mechanical Properties of Hypoeutectic Al-Fe Alloy, and its Dependency with Solidification Thermal Parameters

et al. 2022

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Al-Fe alloys are usually used as packaging and structural materials, but in the recent years, there have been considered for possible applications in aerospace field. The solidification sequence in pure aluminum containing 1 wt.% Fe is described in term of the formation of macrostructure, microstructure, microsegregation, porosity and mechanical properties. This material was studied in the upward unidirectional solidification system under transient heat flow conditions. Differences in microstructure, microsegregation, porosity and mechanical properties such as ultimate tensile strength, elongation and microhardness, due to the thermal parameter effects were observed and discussed. Experimental growth laws relating cellular spacing to the cooling rate and solidification speed have been determined, indicating that the increase in thermal parameter have induced a refinement effect on cell morphology. Microsegregation profiles of Fe solute were experimentally determined from the central region of the cell to the intercellular region under different solidification speeds. The Fe microsegregation determined from central region of the cell (F S = 0) to the intercellular region (F S = 1) show a growing profile, in any case considered. However, the profiles move upward with the increase in solidification speed, which indicates that Fe solubility in solid, increases with the increase in solidification speed. The effect of the solidification thermal parameters and cellular spacing on the porosity content were experimentally investigated. The value of porosity content increased along the casting. These results have pointed out that porosity content is affected by solidification parameters and cellular patterns. Further, measurable effects of the thermal parameters, cellular spacing and porosity content on the mechanical properties were experimentally determined. It stands out among experimental results the influence of porosity on the mechanical properties of as-cast material. In any case analyzed, mechanical properties increase with decreasing porosity content.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%