Effect of Forced Convection by Accelerating Crucible Rotation on Directional Solidification
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Wanqi Jie
,
J. Liu
Abstract
An accelerated crucible rotation (ACR) technique was applied to the Bridgman (B) directional solidification of Al–Cu hypoeutectic and eutectic alloys. For Al–4.5 % Cu hypoeutectic alloys. The development of dendrites was prevented and the cellular spacing was reduced by forced convection in the ACR-B process. For the Al–CuAl2 eutectic alloy, maximum rotation rates of 100, 200, 300 and 400 rpm were adopted, and the growth rate R was varied between 5 and 60 lm/s. The results show that the periodic structure related to the crucible rotation periods occurs when the Reynold's number Re > 500, and that the average eutectic spacing decreases with the increase of Re. It is found that the convection increases the temperature gradient in front of the liquid/solid interface and reduces the depth of the concave interface, depending on Re and R. The convection also changes the solute distribution around the tips of the cells or dendrites or in front of the eutectic growth interface, and therefore influences the growth morphologies in the ACR-B process.
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The research is founded by the National Natural Science Foundation of China.
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© 2001 Carl Hanser Verlag, München
Artikel in diesem Heft
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- Mitteilungen/Notifications
- Personen
- Mitteilungen
- Bücher
- Tagungen
Artikel in diesem Heft
- Contents
- Aufsätze/Articles
- Electron Back Scatter Diffraction and Synchrotron X-Ray Peak Profile Analysis as Tools for Microstructural Characterization of Large Strain Work Hardened Metals
- Influences of Material Inhomogeneities in 100Cr6 Steel on the Electrochemical Metal Dissolution Process
- An Investigation on Cold Roll Welding of Copper to Aluminum Using Electrical Resistivity
- Effect of Forced Convection by Accelerating Crucible Rotation on Directional Solidification
- Phase Transformation Behaviour and Microstructure of Ti51Pd30Ni19 Alloy
- Experimental Study and Reassessment of the Ni–Hf Binary System
- AThermodynamic Assessment of the Pr–Al System
- Phase Diagram and Thermodynamic Properties of the Tl – In – Te System
- The Excess Enthalpies of Liquid In–Bi–Te and Sb–Bi–Te Alloys
- Thermodynamic Evaluation of Binary Phase Diagrams of Small Particle Systems
- On the Hot Workability of ELI Grade Titanium Alloy Ti–6Al–4V
- Revelation of Anomalous Creep of the Cu–30 mass% Zn Alloy Related with Dislocation Hardening under High-Temperature Creep Deformation
- Formation of Nanocrystalline Phases during Decomposition of Amorphous Ni–P Alloys by Continuous Linear Heating
- Lattice Parameters of Metastable Structures in Quenched Fe-Mn Alloys. Part II: hcp Phase
- Einfluss dynamischer Reckalterung auf Lebensdauer und Mikrostruktur bei zyklischer Beanspruchung von X22CrMoV121
- Development of SMD 32.768 kHz Tuning Fork-Type Crystals Using Photolithography and Selective Etching Process
- Mitteilungen/Notifications
- Personen
- Mitteilungen
- Bücher
- Tagungen
