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Microstructure formation and phase selection in the solidification of Al2O3–5 at% SiO2 melts by splat quenching

Published online by Cambridge University Press:  31 January 2011

Mingjun Li ,
Kosuke Nagashio  and
Kazuhiko Kuribayashi
Mingjun Li*
Affiliation:
The Institute of Space and Astronautical Science, 3–1-1, Yoshinodai, Sagamihara, Kanagawa 229–8510, Japan
Kosuke Nagashio
Affiliation:
The Institute of Space and Astronautical Science, 3–1-1, Yoshinodai, Sagamihara, Kanagawa 229–8510, Japan and Department of Materials Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-Ku, Tokyo 113–8656, Japan
Kazuhiko Kuribayashi
Affiliation:
The Institute of Space and Astronautical Science, 3-1-1, Yoshinodai, Sagamihara, Kanagawa 229–8510, Japan and CREST, Japan Science and Technology Corporation, 2-1-6 Sengen, Tsukuba, Ibaraki 305-0047, Japan
*
a)To whom all correrspondence should be addressed.mingjun@materials.isas.ac.jp
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Abstract

An Al2O3–5 at% SiO2 specimen was levitated in an Aero-Acoustic Levitation apparatus and then melted when a continuous-wave CO2 laser beam heating system was incorporated. The sample can be highly undercooled when decreasing the laser power. Rapid solidification by splat quenching can be realized at defined temperatures, using well-polished copper as chilling anvils. Microstructure transition from nonfaceted colony to strong faceted dendrites was observed when the melt was quenched at ΔT = 50 K, indicating that a kinetic contribution for roughening the microstructure may be significant for the morphology transition. The impacting, spreading, and solidifying processes were analyzed on the basis of microstructure observation. The additional undercooling was suggested to vary per an exponential relation with distance when the kinetic effect was taken into account. The nucleation behavior was also discussed according to the proposed additional undercoolings to demonstrate the difference in nucleation population at various regions. When the melt undercooling increases to 190 K, a double-phase structure with small polycrystalline inclusion embedded into amorphous matrix was obtained. The continuous cooling transformation profile was proposed to account for the phase selection upon quenching. The present observation and suggested model for acquiring high additional undercoolings are useful in elucidating the work of others.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 8 , August 2002 , pp. 2026 - 2032
Copyright
Copyright © Materials Research Society 2002

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