Visualization of freckle formation induced by forced melt convection in solidifying GaIn alloys

被引：49

作者：

Boden, S. ^{[1
]}

Eckert, S. ^{[1
]}

Gerbeth, G. ^{[1
]}

机构：

[1] Forschungszentrum Dresden Rossendorf, MHD Dept, D-01314 Dresden, Germany

来源：

MATERIALS LETTERS | 2010年 / 64卷 / 12期

关键词：

Directional solidification; Dendritic growth; Convection; Segregation; X-ray radioscopy; ROTATING MAGNETIC-FIELD; PB-SN ALLOYS; CHANNEL FORMATION; DIRECTIONAL SOLIDIFICATION; DENDRITIC GROWTH; PULSE SEQUENCES; FLOW; MACROSEGREGATION; SEGREGATION;

D O I：

10.1016/j.matlet.2010.03.044

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A bottom-up solidification of a Ga-25 wt.%In alloy under the influence of buoyancy-driven and electromagnetically driven convection was investigated by X-ray radioscopy. The main effect of the flow on the solidification is determined by the flow-induced redistribution of solute concentration which results in a change of the growth direction of the dendrites and the preference of secondary branches for an accelerated or decelerated growth. The experiments demonstrate clearly how the interdendritic flow contributes to the formation of spacious segregation freckles. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：1340 / 1343

页数：4

共 20 条

[1] NONLINEAR-ANALYSIS OF BUOYANT CONVECTION IN BINARY SOLIDIFICATION WITH APPLICATION TO CHANNEL FORMATION [J].

AMBERG, G ;

HOMSY, GM .

JOURNAL OF FLUID MECHANICS, 1993, 252 :79-98

[2] Convection and channel formation in solidifying Pb-Sn alloys [J].

Bergman, MI ;

Fearn, DR ;

Bloxham, J ;

Shannon, MC .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1997, 28 (3A) :859-866

[3] X-ray radioscopic visualization of the solutal convection during solidification of a Ga-30 wt pct in alloy [J].

Boden, S. ;

Eckert, S. ;

Willers, B. ;

Gerbeth, G. .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2008, 39A (03) :613-623

[4] EXPERIMENTAL-STUDY OF CONVECTION IN A MUSHY LAYER DURING DIRECTIONAL SOLIDIFICATION [J].

CHEN, CF .

JOURNAL OF FLUID MECHANICS, 1995, 293 :81-98

[5] Efficient melt stirring using pulse sequences of a rotating magnetic field:: Part I.: Flow field in a liquid metal column [J].

Eckert, S. ;

Nikrityuk, P. A. ;

Raebiger, D. ;

Eckert, K. ;

Gerbeth, G. .

METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE, 2007, 38 (06) :977-988

[6] X-ray radiography observations of columnar dendritic growth and constitutional undercooling in an Al-30wt%Cu alloy [J].

Mathiesen, RH ;

Arnberg, L .

ACTA MATERIALIA, 2005, 53 (04) :947-956

[7] Channel segregation during solidification and the effects of an alternating traveling magnetic field [J].

Medina, M ;

Du Terrail, Y ;

Durand, F ;

Fautrelle, Y .

METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE, 2004, 35 (04) :743-754

[8] SIMULATIONS OF EXPERIMENTALLY OBSERVED DENDRITIC GROWTH-BEHAVIOR USING A PHASE-FIELD MODEL [J].

MURRAY, BT ;

WHEELER, AA ;

GLICKSMAN, ME .

JOURNAL OF CRYSTAL GROWTH, 1995, 154 (3-4) :386-400

[9] A numerical study of unidirectional solidification of a binary metal alloy under influence of a rotating magnetic field [J].

Nikrityuk, PA ;

Eckert, K ;

Grundmann, R .

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2006, 49 (7-8) :1501-1515

[10] THE MECHANISMS OF FORMATION AND PREVENTION OF CHANNEL SEGREGATION DURING ALLOY SOLIDIFICATION [J].

SAMPLE, AK ;

HELLAWELL, A .

METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1984, 15 (12) :2163-2173

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