Primary spacing selection of CuMn alloy under laser rapid solidification condition

Pan, Qingyue; Huang, Weidong; Lin, Xin; Zhou, Yannan

doi:10.1016/s0022-0248(97)00273-x

Cited by 34 publications

(16 citation statements)

References 20 publications

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“…A dendrite structure is characterized by the microstructure parameters. Numerous solidification studies have been reported with a view to characterizing primary dendrite arm spacing (l 1 ), secondary dendrite arm spacing (l 2 ) and dendrite tip radius (R) as a function of alloy solute concentration (C 0 ), growth rate (V) and temperature gradient (G) ahead of the microscopic solidification front [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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Dependency of the dendritic arm spacings and tip radius on the growth rate and composition in the directionally solidified succinonitrile–carbon tetrabromide alloys

Kaya

Çadırlı

Keşlıoğlu

et al. 2005

Journal of Crystal Growth

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Section: Introductionmentioning

confidence: 99%

“…Recent empirical [6][7][8][9] and theoretical [10][11][12] studies have claimed the existence of an allowable range of stable spacings. This has been interpreted in such a way that no unique spacing selection criterion operates for l; and an array with a band of spacings is stable under given experimental conditions.…”

Section: Introductionmentioning

confidence: 99%

Dependency of the dendritic arm spacings and tip radius on the growth rate and composition in the directionally solidified succinonitrile–carbon tetrabromide alloys

Kaya

Çadırlı

Keşlıoğlu

et al. 2005

Journal of Crystal Growth

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“…The decrease in activation energy was previously observed for copper oxide due Formation of nanocrystals is one of the methods to prevent transmission of shear band [46,27,7,47,48,49,50]. Detection of the crystallines in this work is one of the aspects indicating potential for industrial applications.…”

Section: Temperature and Heat Flowmentioning

confidence: 51%

Surface Modification of the Bulk Metallic Glass Zr$_{46}$Cu$_{36.8}$Ag$_{9.2}$Al$_8$ Triggered by Millisecond Laser Irradiation

Shlykova¹,

Gasanov²,

Nasedkin³

et al. 2018

Preprint

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Zirconium based bulk metallic glasses are industrially valuable materials which commercial market grows rapidly. Surface modification of these metallic glasses by high-intensity lasers is relatively new and costly treatment promising great advantages over classical surface processing methods. In this work we perform the case study of surface modification of Zr$_{46}$Cu$_{36.8}$Ag$_{9.2}$Al$_8$ metallic glass by high-intensity millisecond laser beam. Our results suggest chemical deposition of atmospheric oxygen and nitrogen in the laser-melted surface area and its surroundings. Zirconium nitride layer was detected in the middle of laser-irradiated area. Nanocrystals embedded in the amorphous matrix were also formed on the surface. Overall, our findings suggest possibilities for improvement of mechanical characteristics of the studied metallic glass.

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“…Although no well-defined route exists for calculating dendrite trunk radius most authors have assumed this to be a constant multiple of the tip radius. [7,8] Accordingly, we have assumed that the tip radius, which is characteristic of the undercooling at which the dendrite grew and is here estimated from the LKT model, [5] can be used to set the length scale for the problem, with r 1 , r 2 , and L all being fixed multiples of R. Schwarz et al [7] found that the ratio of calculated tip radius to dendrite trunk radius measured in as-solidified samples was approximately 20 with a standard deviation of 10, this result being independent of undercooling. [9] More recently Kaufmann has measured the ratio of dendrite tip to trunk and radius in the transparent Xenon system and found a ratio of »10.…”

mentioning

confidence: 99%

The Effects of Fluid Flow During Rapid Dendritic Solidification

Mullis¹,

Walker

Battersby

2000

Adv. Eng. Mater.

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Mechanical interactions between dendrites and their parent melt are usually considered insignificant. [1] However, during rapid solidification the twin conditions required to produce mechanical damage may exist: high flow velocities and very fine dendrites. In this communication we present evidence of a deformed dendritic structure that arose during rapid solidification. We show that at the high growth rates involved (2.3 m s ±1 ), thermo-solutal advection, which is the dominant mechanism of dendritic deformation during conventional semi-solid processing, [2] is unlikely to have a significant effect. A model for the skin stress resulting from flow around a family of realistically shaped dendrites is presented and we find that, within a narrow undercooling range about a local minimum in the tip radius, mechanical deformation is likely.Experimental evidence for deformed dendritic structures being produced by rapid solidification comes from a recent paper by Battersby, Cochrane, and Mullis, in which the results of a comparative study of the solidification of Cu, Cu±O, and Cu±Sn melts were presented. [3] Samples of approximately 5 mm in diameter were undercooled by being encased in a molten soda lime glass flux under an inert atmosphere. Samples were melted by induction heating of a graphite susceptor. Nucleation was initiated at a predefined undercooling by touching the sample in a well-defined position with a thin needle. By cutting viewing slots in the susceptor the recalescence front could be observed directly and its velocity measured using a linear photo-diode array. In one of these samples, a Cu±3 wt.-% Sn alloy undercooled by 73 K, there was evidence of a deformed dendritic structure, which is shown in Figure 1. The velocity of the solidification front in this sample was measured to be 2.3 m s ±1 . This deformed structure is likely to have arisen because of differential flow between the parent melt and the solid dendritic skeleton while the sample was in the semi-solid state.Many of the techniques of rapid solidification processing provide high fluid velocities in the melt. From the measured recalescence velocity and the absence of shrinkage voids in the as-solidified Cu±3 wt.-% Sn sample, we deduce that the shrinkage flow required to maintain continuity at the solid± liquid interface was V s » 0.09 m s ±1 . Estimates of the flows induced in undercooled melts by electromagnetic stirring are typically 0.3 m s ±1 , [4] although in the Cu±3 wt.-% Sn sample reported this may be reduced by a factor of 2 or 3 because of partial electromagnetic screening by the graphite susceptor. Consequently, we believe that interdendritic flow velocities in the sample of the order 0.1 m s ±1 may not be unreasonable.Here we consider two mechanisms that could give rise to the deformed dendritic structures observed: thermo-solutal advection and direct mechanical damage. These two mechanisms give, in principle, experimentally distinguishable predictions in that thermo-solutal advection predicts that the dendrite bends into the flow (...

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Primary spacing selection of CuMn alloy under laser rapid solidification condition

Cited by 34 publications

References 20 publications

Dependency of the dendritic arm spacings and tip radius on the growth rate and composition in the directionally solidified succinonitrile–carbon tetrabromide alloys

Dependency of the dendritic arm spacings and tip radius on the growth rate and composition in the directionally solidified succinonitrile–carbon tetrabromide alloys

Surface Modification of the Bulk Metallic Glass Zr$_{46}$Cu$_{36.8}$Ag$_{9.2}$Al$_8$ Triggered by Millisecond Laser Irradiation

The Effects of Fluid Flow During Rapid Dendritic Solidification

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