The effect of solidification rate on microsegregation

Sarreal, J. A.; Abbaschian, G. J.

doi:10.1007/bf02645003

Cited by 152 publications

(68 citation statements)

References 13 publications

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“…According as Cu-Cr phase diagram, a equation can be gotten for volume fraction of eutectic f E [15]: …”

Section: Effect Of Solidification Rate On Volume Fraction Of Eutecticmentioning

confidence: 99%

Interface morphology evolvement and microstructure characteristics of hypoeutectic Cu–1.0 wt%Cr alloy during unidirectional solidification

Hu¹,

Xiao-qin

et al. 2005

Science and Technology of Advanced Materials

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Effect of unidirectional solidification rate on microstructure of hypoeutectic Cu-1.0%Cr alloy was investigated. The microstructure evolution of Cu-1.0%Cr alloy was noticed especially during the unidirectional solidification with the different solidification rates. It is shown that eutectic (aCb) and primary a(Cu) phase grew up equably in parallel to direction of solidification. A kind of fibriform microstructure will appear when unidirectional solidification rate is up to some enough high certain values. When temperature gradient was changeless, the interface morphology evolution of the primary a(Cu) phase underwent to a series of changes from plane to cell, coarse dendrite, and fine dendrite grains with increasing the solidification rates. Primary dendrite arm spacing l1 of a(Cu) phase increases with increasing the solidification rate where the morphology of the solid/liquid (S/L) interface is cellular. However, l1 decreases with further increasing the solidification rate where the S/L interface morphology is changed from cell to dendrite-type. Its rule might accord with Jackson-Hunt theory model. An experience equation obtained is as follows:On the other hand, secondary dendrite spacing l2 of primary a(Cu) phase will thin gradually with increasing the solidification rate. Moreover, secondary dendrite will become coarse in further solidification. Another experience equation about relationship among secondary dendrite arm spacing (l 2 ), temperature gradient G L and the velocity of the S/L interface (V) is that: l 2 ZK0:0003C 0:0027ðG L VÞ K1=3 . In addition, the volume fraction of eutectic will decrease with the increase of solidification rate. q

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“…According as Cu-Cr phase diagram, a equation can be gotten for volume fraction of eutectic f E [15]: …”

Section: Effect Of Solidification Rate On Volume Fraction Of Eutecticmentioning

confidence: 99%

Interface morphology evolvement and microstructure characteristics of hypoeutectic Cu–1.0 wt%Cr alloy during unidirectional solidification

Hu¹,

Xiao-qin

et al. 2005

Science and Technology of Advanced Materials

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“…The correlation between SDAS and cooling rate in Al-Cu alloy at the Al-rich end of the phase diagram has been widely studied and consequently a number of conversions from SDAS are available [14,15,16,17,18]. The effect on the estimated cooling rate of applying these various scaling laws is considered fully in the Section 3.…”

Section: Introductionmentioning

confidence: 99%

Estimation of Cooling Rates During Close-Coupled Gas Atomization Using Secondary Dendrite Arm Spacing Measurement

Farrell

Mullis

Adkins

2013

Metall Mater Trans B

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Al-4 wt.%Cu alloy has been gas atomized using a commercial close-coupled gas atomization system. The resulting metal powders have been sieved into six size fractions and the secondary dendrite arm spacing has been determined using electron microscopy. Cooling rates for the powders have been estimated using a range of published conversion factors for Al-Cu alloy, with reasonable agreement being found between sources. We find that cooling rates are very low compared to those often quoted for gas atomized powders, of the order of 10 4 K s -1 for sub-38 μm powders. We believe that a number of numerical studies of gas atomization have overestimated the cooling rate during solidification, probably as a consequence of overestimating the differential velocity between the gas and the particles. From the cooling rates measure here we estimate that such velocities are unlikely to exceed 20 m s -1 .

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“…The variation in the eutectic fraction as a function of cooling rate is also an important parameter, which for aluminum alloys has been debated within the literature. Sarreal and Abbaschian [29] reported that the eutectic fraction increases with increasing cooling rate while Nafisi et al [30] reported the reverse. The current data, however, shows that for cooling rates from 5 to 15 K/min the fraction eutectic for the B206 alloy ranges between 4-5% irrespective of the applied cooling rate.…”

Section: Evolution In Fraction Solidmentioning

confidence: 93%

Microstructure Characterization and Thermal Analysis of Aluminum Alloy B206 During Solidification

Haghdadi

Phillion

Maijer

2015

Metall Mater Trans A

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The solidification kinetics of a high strength B206 aluminum casting alloy as a function of cooling rates between 1 and 15 K/min has been characterized through a combination of differential scanning calorimetry (DSC), scanning electron microscopy (SEM), and optical microscopy. Three different peaks were detected in the DSC analysis, which corresponded to the nucleation of an α-Al solid solution, an Al-Cu-Fe intermetallic and the eutectic phases. The presence of these phases was confirmed using a coupled scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) analysis. The α-Al nucleation temperature was found to be independent of cooling rate while the eutectic and the intermetallic formation temperatures were depressed by up to 20 K. The evolution of the fraction solid, particularly during the solidification of α-Al was also affected by the cooling rate in such a way that slower cooling was accompanied by a higher fraction solid at a given temperature. Concurrently, microscopy was used in order to quantify the variation in secondary dendrite arm spacing (SDAS) with cooling rate for use in numerical simulations of casting processes.

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The effect of solidification rate on microsegregation

Cited by 152 publications

References 13 publications

Interface morphology evolvement and microstructure characteristics of hypoeutectic Cu–1.0 wt%Cr alloy during unidirectional solidification

Interface morphology evolvement and microstructure characteristics of hypoeutectic Cu–1.0 wt%Cr alloy during unidirectional solidification

Estimation of Cooling Rates During Close-Coupled Gas Atomization Using Secondary Dendrite Arm Spacing Measurement

Microstructure Characterization and Thermal Analysis of Aluminum Alloy B206 During Solidification

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