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Solidification microstructures: recent developments, future directions
Acta Materialia, 2000The status of solidification science is critically evaluated and future directions of research in this technologically important area are proposed. The most important advances in solidification science and technology of the last decade are discussed: interface dynamics, phase selection, microstructure selection, peritectic growth, convection effects ...
Boettinger, W. J. +6 more
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Solidification microstructure of laser remelted Al2O3ZrO2 eutectic
Acta Materialia, 1997Surface resolidification experiments using a high power CO{sub 2}-laser have been performed on an Al{sub 2}O{sub 3}-ZrO{sub 2} containing 36.8 at.% ZrO{sub 2} eutectic alloy at beam velocities between 0.3 and 8 mm {center_dot} s{sup {minus}1}. The local growth rate has been measured by observation of the orientation of the microstructure using scanning
Bourban, S. +3 more
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Solidification microstructure of fusion welds
Materials Science and Engineering, 1984Abstract This paper is mainly concerned with the microstructure developed during weld solidification and the effect of the various welding and materials parameters. It is shown that weld solidification is in several ways fundamentally different from solidification in conventional casting, in that it is a dynamic (moving heat source) process in which ...
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Microstructural modeling of solidification in A356 alloy
Materials Characterization, 1995Abstract Macro-micro models assume a constant value for maximum nuclei density, n 0 , to predict the microstructure. This assumption may not be valid for all casting processes and process conditions. In an earlier article, maximum nuclei density was observed to vary with the casting process and pouring temperatures.
R. Venkataramani +2 more
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Refinement of Solidification Microstructures by the MCAST Process
Materials Science Forum, 2010MCAST (melt conditioning by advanced shear technology) is a novel processing technology developed recently for conditioning liquid metal under intensive forced convection prior to solidification processing. The MCAST process uses a twin screw mechanism to impose a high shear rate and a high intensity of turbulence to the liquid metal, so that the ...
Z. Fan +6 more
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Solidification - Cristallisation et microstructures
Étude et propriétés des métaux, 1986En ce qui concerne l’elaboration des metaux, les operations de coulee portent sur des quantites considerables : chaque annee, dans le monde, pres d’un milliard de tonnes de metal sont solidifiees, en premier lieu des alliages ferreux (aciers et fontes), en second lieu des alliages d’aluminium.
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Microstructure Evolution in a Directional Solidification Process
Materials Science Forum, 2005Models and theories of the microstructure evolution in a directional solidification (DS) process will be firstly addressed. Discrepancies between theories and experiments will be presented. For the thin film sample growth in a temperature gradient stage, the geometrical constraint makes it difficult to compare the experimental primary spacing with ...
Shan Liu, R. Trivedi
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Selection of microstructures in rapid solidification processing
Materials Science and Engineering: A, 1994Abstract A great variety of microstructures may be observed in an alloy when the solidification conditions and the composition are changed. A criterion for the selection of a given microstructure is presented which is based on comparison of the relevant interface response functions and on the assumption of maximum interface temperature ...
W. Kurz, P. Gilgien
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Rapid solidification processing and microstructure formation
Materials Science and Engineering: A, 1994Abstract An overview of rapid solidification is undertaken and various rapid solidification processes are grouped into three classes. This leads to a better understanding of the similarities and differences between the various methods in terms of solidification parameters.
W. Kurz, R. Trivedi
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Solidification microstructure, dendrites and convection
2004One crucial step in almost all materials processes is solidification in one form or other. The conditions under which the melt resolidifies will be crucial for the final microstructure of the material. The size and morphology of the individual grains that make up a polycrystalline material, the homogeneity of a monocrystal, the actual phase that is ...
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