Halo formation in arc-melted Cr–Nb alloys

Li, K.W.; Li, S.M.; Xue, Yufei; Fu, Hengzhi

doi:10.1016/j.jcrysgro.2012.07.042

Cited by 8 publications

(10 citation statements)

References 27 publications

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“…Correspondingly, the α‐Cr primary phase eliminated gradually during the growth process. In addition, the occurrence of β‐Cr 2 Nb primary dendrites is always accompanied with α‐Cr particles (figure b and c) due to the fact that the precipitation of α‐Cr primary phase can promote the formation of β‐Cr 2 Nb primary dendrites as the α‐Cr particles are good nucleating agents for β‐Cr 2 Nb . With the further increase in solidification distance, the temperature of the melt increased higher than T c3 to T 2 , the α‐Cr was not undercooled anymore.…”

Section: Resultsmentioning

confidence: 98%

“…According to the Cr‐Nb phase diagram , the equilibrium solidification microstructure of Cr‐18.5%Nb alloy should be consisted of coupled eutectic containing Cr and Cr 2 Nb phases. In the off‐eutectic Cr‐Cr 2 Nb alloys, either Cr primary dendrites or Cr 2 Nb primary dendrites will occur in the solidified microstructures.…”

Section: Resultsmentioning

confidence: 99%

“…In this case, the primary nucleating phase is not the primary growing phase in the alloy melt. Combined with the effects of coupled eutectic zone , an explanation was proposed to describe the formation of Cr and Cr 2 Nb primary phases in the eutectic alloy.…”

Section: Resultsmentioning

confidence: 99%

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Solidification behavior and microstructural evolution of the Cr‐Nb eutectic alloy

Zhong

et al. 2013

Crystal Research and Technology

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A series of microstructures including fully coupled eutectic, both α-Cr and β-Cr 2 Nb primary dendrites embedded in eutectic and only β-Cr 2 Nb primary dendrites plus eutectic were observed in the arc-melted Cr-Cr 2 Nb eutectic alloy. By employing EPMA analysis performed at the eutectic regions, the eutectic composition of the Cr-Cr 2 Nb system was indicated to contain less than 18 at.%Nb. Based on the solidification phase selection involving phase competitive nucleation and growth, the α-Cr phase was predicted to be the primary nucleating phase and the β-Cr 2 Nb the primary growing phase. Under large undercooling conditions, the solidification process was controlled by nucleation, which led to the formation of α-Cr primary particles. With the decrease in undercooling, the solidification process developed into growth controlling, which caused the occurrence of β-Cr 2 Nb primary phase since the actual solidification path of the alloy lay within the hypereutectic region. The explanation was confirmed by the experimental composition analysis.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

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Solidification behavior and microstructural evolution of the Cr‐Nb eutectic alloy

Zhong

et al. 2013

Crystal Research and Technology

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“…4b). This phenomena might be caused by severe microsegregation of Al and Ta at interdendritic region (as shown in Table 2), which promoted the formation of Al-and Ta-rich divorced γ/γ' eutectic (high volume fraction of γ' phases and low volume fraction of γ phases) [40,41]. Meanwhile, as shown in Fig.…”

Section: Effect Of Al Content On Microsegregation Behavior and Solidimentioning

confidence: 99%

Influence of Al content on non-equilibrium solidification behavior of Ni–Al–Ta model single crystal alloys

Zhou

Zhang

et al. 2016

Journal of Crystal Growth

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“…However, the observation of a halo of one phase around a primary dendrite of another phase is a common occurrence during the solidification of off-eutectic alloys, which has been the subject of a considerable number of theoretical and experimental investigations [5][6][7][8][9]. By controlling the type and morphology of halo, the alloys with desired mechanical properties can be developed, similar to the deformation behavior of the ductile iron.…”

Section: Introductionmentioning

confidence: 99%

Halo Formation in Binary Fe-Nb Off-eutectic Alloys

Li¹,

Wang²,

et al. 2015

High Temperature Materials and Processes

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In the Fe-Fe 2 Nb eutectic system, halo formations were observed at both the hypo-and hypereutectic compositions. This observation cannot be well explained by the existing halo theories based on competitive growth or competitive nucleating alone. In the present paper, a new explanation is proposed to describe the formation of halos in the binary Fe-Fe 2 Nb off-eutectic alloys. By theo retical calculations, the α-Fe and Fe 2 Nb are predicted to be the primary growing phase in the hypo-and hypereutectic compositions, respectively. Based on the experimental observations, the Fe 2 Nb Laves phase was identified as a good nueleant for α-Fe phase, but not vice versa. By analysing of the competitive growth among the involved phases and the growth undercoolings of the two individual eutectic phases, the formation of halos in the Fe-Fe 2 Nb alloys is explained successfully.

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Halo formation in arc-melted Cr–Nb alloys

Cited by 8 publications

References 27 publications

Solidification behavior and microstructural evolution of the Cr‐Nb eutectic alloy

Solidification behavior and microstructural evolution of the Cr‐Nb eutectic alloy

Influence of Al content on non-equilibrium solidification behavior of Ni–Al–Ta model single crystal alloys

Halo Formation in Binary Fe-Nb Off-eutectic Alloys

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