Stability of Tip of Needle Dendrite for SCN-Acetone Alloy &amp;mdash;Experimental Study for Langer/M&amp;uuml;ller-Krumbhaar Conjecture&amp;mdash;

Miyata, Yasunori; Kume, Yukio; Fujimoto, Manabu; Morita, Tomoji

doi:10.2320/jinstmet1952.61.10_1101

Cited by 3 publications

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“…The significant figure of obtained by the present method is at best 2 order. Shinomiya (À0:39) 13,14) and Miyata et al (À0:48), 12) respectively. Figure 5 shows the 1 -V relationships were compared for the succinonitrile-4.59 mol%aceton system with G ¼ 0:1, T low ¼ 293 and for the succinonitrile-2.66 mol%aceton system with G ¼ 0:1, T low ¼ 305.…”

Section: Formulation Of Phase Field Methodsmentioning

confidence: 99%

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Phase Field Simulation on Directional Solidification of Succinonitrile (SCN)–Acetone Organic Model Alloy

2005

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Phase field simulation on directional solidification of succinonitrile (SCN)-acetone organic model alloy was performed. The development of concentration and phase field profile was calculated in order to clarify the dependences of growth velocity V and temperature gradient G on the morphology of growing crystal.Concerning the primary dendrite arm spacing, 1 , the relationship between 1 4 G 2 V=kÁT 0 and V was examined, where k and ÁT 0 are partition coefficient and temperature difference between liquid and solid phases, respectively. The calculated values of 1 4 G 2 V=kÁT 0 did not show a universal relationship but the trends of the present calculation can be understood by extrapolation from experimental data. The power law index of V for the 1 4 G 2 V=kÁT 0 -V plot took similar values between the experiments and the present calculation for some cases. The 1 -V relationship did not show dependences on temperature of the low temperature side and nor acetone concentration. For the curvature radius R, the R-V relationship can be fitted by a simple function regardless the value of G. In addition, the calculated values of R and the power low indexes of V for R were compared to the dendrite growth theory and good accordance was confirmed.

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Section: Formulation Of Phase Field Methodsmentioning

confidence: 99%

“…[11][12][13][14] The relationships among thermodynamic driving force, growth velocity and crystal morphology were studied and compared to those of real alloy system. The obtained results were effectively utilized to analyze the crystal growth process.…”

Section: Introductionmentioning

confidence: 99%

Phase Field Simulation on Directional Solidification of Succinonitrile (SCN)–Acetone Organic Model Alloy

2005

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“…SCN acetone を用いた成長速度 V と DAS1 についての研究を行っており10,11) ，比較のためにそのデータも併せて示してある．この結果より SCN 1.9 mass acetone における成長速度 . The dotted line represents d 1 ＝1444×V -0.48 , the broken line d 1 ＝1047×V -0.50 , the thick solid line d 1 ＝645.5× V -0.39 and the thin solid line d 1 ＝522.6×V -0.35 .…”

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Dendrite Growth of Succinonitrile (SCN)-Acetone Organic Model Alloy

Sasajima¹,

Ichimura²

2005

J. Japan Inst. Metals

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Unidirectional solidification experiments of a model alloy of succinonitrile (SCN) acetone that is a transparent organic compound and is available for a direct observation were performed in order to clarify the solidification process of binary alloy. The dependences of primary arm spacing (DAS1) of dendrite and secondary arm spacing (DAS2) on the growth speed of a crystal were studied.The sample, heareafter called as the cell, was inserted into the gap of the two slides (26 mm×76 mm×1.3 mm each), of which distance was 200 mm. The cell was pulled at a constant speed V toward the low temperature side under the fixed temperature gradient (1 K/mm). Changing pulling speed of the cell controlled the growth speed of the crystal.The composition of the examined samples is SCN 1.9 mass acetone and SCN 6.0 mass acetone. DAS1 V relationship was studied for the 1.9 mass case only and found to be in proportional with the growth speed V -1/2 . This is almost the same as that of unidirectional solidification of aluminum (0.1 6.9) massSi alloy. DAS2 of 1.9 mass and 6.0 mass changed with growth speed as V -1/3 . However, when growth speed increased, DAS2 of 1.9 mass and 6.0 mass decreased more than the V -1/3 relationship. DAS2 of 6.0 mass separated from the curve of V -1/3 earlier than that of 1.9 mass.

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Constrained Solidification in High Rate and Transition of Morphology

Miyata¹,

Takahashi²,

Herai³

2007

J. Japan Inst. Metals

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Solidification morphology in high rate is studied in the constrained solidification of organic material. Tip radius of curvature of needle crystal has decreased with growth rate by power -1/2, irrespective of interfacial shape, dendrite or cellular. Primary arm spacing of needles has decreased with growth rate, and it has diverged at some critical high growth rate. It has resulted very far from dendrites to each other. It is observed that, near the critical rate, some dendrites predominantly grow and their higher order arms develop in the interdendritic region. These arms will grow to cellular morphology above the critical growth rate.

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Stability of Tip of Needle Dendrite for SCN-Acetone Alloy —Experimental Study for Langer/Müller-Krumbhaar Conjecture—

Cited by 3 publications

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Phase Field Simulation on Directional Solidification of Succinonitrile (SCN)–Acetone Organic Model Alloy

Phase Field Simulation on Directional Solidification of Succinonitrile (SCN)–Acetone Organic Model Alloy

Dendrite Growth of Succinonitrile (SCN)-Acetone Organic Model Alloy

Constrained Solidification in High Rate and Transition of Morphology

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Stability of Tip of Needle Dendrite for SCN-Acetone Alloy &mdash;Experimental Study for Langer/M&uuml;ller-Krumbhaar Conjecture&mdash;

Cited by 3 publications

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Phase Field Simulation on Directional Solidification of Succinonitrile (SCN)&ndash;Acetone Organic Model Alloy

Phase Field Simulation on Directional Solidification of Succinonitrile (SCN)&ndash;Acetone Organic Model Alloy

Dendrite Growth of Succinonitrile (SCN)-Acetone Organic Model Alloy

Constrained Solidification in High Rate and Transition of Morphology

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Stability of Tip of Needle Dendrite for SCN-Acetone Alloy —Experimental Study for Langer/Müller-Krumbhaar Conjecture—

Phase Field Simulation on Directional Solidification of Succinonitrile (SCN)–Acetone Organic Model Alloy

Phase Field Simulation on Directional Solidification of Succinonitrile (SCN)–Acetone Organic Model Alloy