Microstructure evolution in immiscible alloys during rapid directional solidification
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J.Z. Zhao
,
J. He
Abstract
A model has been developed by taking into account the common action of the nucleation, the diffusional growth, the collisions and coagulations of the minority phase droplets and the spatial phase segregation to describe the microstructure evolution in a rapidly directionally solidified immiscible alloy. Numerical solutions have been performed to investigate the microstructure evolution in a directionally solidified hypermonotectic Al –Pb alloy. It has been shown that an undercooled region appears in front of the solid/liquid interface and the liquid –liquid decomposition takes place there. If the solidification velocity is high enough, a steady state of solidification can be established and a fine dispersion of minority phase particles in a hypermonotectic alloy can be obtained.
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The authors gratefully acknowledge the financial support from the Sino-Germany Science Foundation (Gz 032/1), the National Natural Science Foundation of China (50271076 and 50371092) and the Natural Science Foundation of Liaoning Province of China (20022010).
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© 2004 Carl Hanser Verlag, München
Articles in the same Issue
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- Challenges and interesting observations associated with feedback-controlled nanoindentation
- Nanoscratching on surfaces: the relationships between lateral force, normal force and normal displacement
- Nano-scratch testing on thin diamond-like carbon coatings for microactuators: friction, wear and elastic-plastic deformation
- Comparison of hardness and Young’s modulus by single indentation and multiple unloading indentation
- Nanomechanical characterization of Ti-base nanostructure-dendrite composite
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- Dynamic indentation measurements on amorphous materials
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- Effects of an external electric field applied during the solution heat treatment of the Al-Mg-Si-Cu alloy AA6111
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- Punch-shear tests and size effects for evaluating the shear strength of machinable ceramics
- Study of Ti–Si in situ composite processing by multi-stage eutectic solidification
- Twin-roll cast Al–Mg –Si sheet for automotive applications
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- Notifications/Mitteilungen
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- Books/Bücher
- Press/ Presse
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Articles in the same Issue
- Frontmatter
- Editorial
- Challenges and interesting observations associated with feedback-controlled nanoindentation
- Nanoscratching on surfaces: the relationships between lateral force, normal force and normal displacement
- Nano-scratch testing on thin diamond-like carbon coatings for microactuators: friction, wear and elastic-plastic deformation
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- Nanomechanical characterization of Ti-base nanostructure-dendrite composite
- Surface topography and nanomechanical/tribological behaviour of ultrathin nitride films on silicon
- Viscosity of glass at high contact pressure during indentation experiments
- Dynamic indentation measurements on amorphous materials
- Technique for measuring the residual strain in strained Si/SiGe MOSFET structures using Raman spectroscopy
- Partial atomic volumes of early transition metals in A10 metal-based solid solutions
- Effects of an external electric field applied during the solution heat treatment of the Al-Mg-Si-Cu alloy AA6111
- Fatigue crack propagation in pseudoelastic TiNi smart microcomponents
- Microstructure evolution in immiscible alloys during rapid directional solidification
- The creep performance of a sand-cast Mg–2.8 Nd–0.8 Zn–0.5 Zr–0.3 Gd alloy at 241 to 262°C
- Punch-shear tests and size effects for evaluating the shear strength of machinable ceramics
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- Twin-roll cast Al–Mg –Si sheet for automotive applications
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- Press/ Presse
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- Editorial
- Editorial
- Articles Basic
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- Nanoscratching on surfaces: the relationships between lateral force, normal force and normal displacement
- Nano-scratch testing on thin diamond-like carbon coatings for microactuators: friction, wear and elastic-plastic deformation
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- Articles Applied
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- Twin-roll cast Al–Mg –Si sheet for automotive applications
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