Paper Titles

Preface and Organizing Committee

Research on Milling Parameters Optimization Based on Surface Residual Stress for Aviation Stainless Steel
p.3

An Analysis of Electromagnetic Sheet Metal Forming Process
p.9

Cracked ITO on Polyester Film Substrates for Electro-Optic Applications
p.15

Containerless Processing in the Study of Metastable Solids from Undercooled Melts
p.21

Experimental Research on Surface Roughness and Topography of Grinding Ultra-High Strength Steel Aermet100 with CBN Wheel
p.28

Study on Preparation and Photocatalytic Activity of Photocatalyst Made from Ti-Bearing Blast Furnace Slag
p.33

Research of the Surface Changes in the Modification Process of Activated Carbon
p.40

Study of Method for Determination of Thermal Conductivity of Automotive Interior Materials
p.46

HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 526Containerless Processing in the Study of...

Containerless Processing in the Study of Metastable Solids from Undercooled Melts

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Abstract:

An undercooled melt possesses an enhanced free enthalpy that enables to crystallize metastable solids in competition with their stable counterparts. Crystal nucleation selects the crystallographic phase whereas the growth dynamics controls microstructure evolution. We apply containerless processing such as electromagnetic and electrostatic levitation to containerlesss undercool and solidify metallic melts. Heterogeneous nucleation on container-walls is completely avoided leading to large undercooling with the extra benefit that the freely suspended drop is direct accessible for in situ observation of crystallization far away from equilibrium. Results of investigations of maximum undercoolability on pure zirconium are presented showing the limit of maximum undercoolability set by the onset of homogeneous nucleation. Rapid dendrite growth is measured as a function of undercooling by a high-speed camera and analysed within extended theories of non-equilibrium solidification. In such both supersaturated solid solutions and disordered superlattice structure of intermetallics are formed at high growth velocities. A sharp interface theory of dendrite growth is capable to describe the non-equilibrium solidification phenomena during rapid crystallization of deeply undercooled melts.

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Periodical:

Applied Mechanics and Materials (Volume 526)

Pages:

21-27

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.526.21

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Online since:

February 2014

Authors:

Dieter Herlach*

Keywords:

Containerless Processing, Crystal Nucleation, Dendritic Growth, Disorder Trapping, Metastable Solids, Supersaturated Alloys, Undercooling

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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