Theoretical prediction and experimental comparison for eutectic growth of Al2O3/GdAlO3 faceted eutectics

Weidan Ma; Jun Zhang; Haijun Su; Guangrao Fan; Qun Ren; Zhonglin Shen; Min Guo; Lin Liu; Hengzhi Fu

doi:10.1016/j.jeurceramsoc.2019.05.014

Theoretical prediction and experimental comparison for eutectic growth of Al₂O₃/GdAlO₃ faceted eutectics

Weidan Ma, Jun Zhang, Haijun Su, Guangrao Fan, Qun Ren, Zhonglin Shen, Min Guo, Lin Liu, Hengzhi Fu

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

Abstract

Ultra-fine Al₂O₃/GdAlO₃ eutectics with eutectic spacing of 193 ± 20 nm are directionally solidified by laser floating zone melting process. When the solidification rate increases from 2 μm/s to 400 μm/s, the morphology transition from “Chinese script” irregular eutectic to rod-like regular eutectic is found. To predict the growth behaviour of Al₂O₃/GdAlO₃ eutectic, the solute diffusion coefficient D_L, which exhibits significant influence on eutectic growth, is determined to be 6 × 10⁻¹⁰ m²/s. Then, the eutectic microstructures as a function of solidification rate are well predicted by modified Magnin-Kurz model and Jackson-Hunt model, both for “Chinese script” irregular eutectic and rod-like regular eutectic, respectively.

Original language	English
Pages (from-to)	3837-3842
Number of pages	6
Journal	Journal of the European Ceramic Society
Volume	39
Issue number	13
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2019.05.014
State	Published - Oct 2019

Keywords

Directional solidification
Eutectic spacing
Laser floating zone melting
Morphology transition

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title = "Theoretical prediction and experimental comparison for eutectic growth of Al2O3/GdAlO3 faceted eutectics",

abstract = "Ultra-fine Al2O3/GdAlO3 eutectics with eutectic spacing of 193 ± 20 nm are directionally solidified by laser floating zone melting process. When the solidification rate increases from 2 μm/s to 400 μm/s, the morphology transition from “Chinese script” irregular eutectic to rod-like regular eutectic is found. To predict the growth behaviour of Al2O3/GdAlO3 eutectic, the solute diffusion coefficient DL, which exhibits significant influence on eutectic growth, is determined to be 6 × 10−10 m2/s. Then, the eutectic microstructures as a function of solidification rate are well predicted by modified Magnin-Kurz model and Jackson-Hunt model, both for “Chinese script” irregular eutectic and rod-like regular eutectic, respectively.",

keywords = "Directional solidification, Eutectic spacing, Laser floating zone melting, Morphology transition",

author = "Weidan Ma and Jun Zhang and Haijun Su and Guangrao Fan and Qun Ren and Zhonglin Shen and Min Guo and Lin Liu and Hengzhi Fu",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier Ltd",

year = "2019",

month = oct,

doi = "10.1016/j.jeurceramsoc.2019.05.014",

language = "英语",

volume = "39",

pages = "3837--3842",

journal = "Journal of the European Ceramic Society",

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TY - JOUR

T1 - Theoretical prediction and experimental comparison for eutectic growth of Al2O3/GdAlO3 faceted eutectics

AU - Ma, Weidan

AU - Zhang, Jun

AU - Su, Haijun

AU - Fan, Guangrao

AU - Ren, Qun

AU - Shen, Zhonglin

AU - Guo, Min

AU - Liu, Lin

AU - Fu, Hengzhi

PY - 2019/10

Y1 - 2019/10

N2 - Ultra-fine Al2O3/GdAlO3 eutectics with eutectic spacing of 193 ± 20 nm are directionally solidified by laser floating zone melting process. When the solidification rate increases from 2 μm/s to 400 μm/s, the morphology transition from “Chinese script” irregular eutectic to rod-like regular eutectic is found. To predict the growth behaviour of Al2O3/GdAlO3 eutectic, the solute diffusion coefficient DL, which exhibits significant influence on eutectic growth, is determined to be 6 × 10−10 m2/s. Then, the eutectic microstructures as a function of solidification rate are well predicted by modified Magnin-Kurz model and Jackson-Hunt model, both for “Chinese script” irregular eutectic and rod-like regular eutectic, respectively.

AB - Ultra-fine Al2O3/GdAlO3 eutectics with eutectic spacing of 193 ± 20 nm are directionally solidified by laser floating zone melting process. When the solidification rate increases from 2 μm/s to 400 μm/s, the morphology transition from “Chinese script” irregular eutectic to rod-like regular eutectic is found. To predict the growth behaviour of Al2O3/GdAlO3 eutectic, the solute diffusion coefficient DL, which exhibits significant influence on eutectic growth, is determined to be 6 × 10−10 m2/s. Then, the eutectic microstructures as a function of solidification rate are well predicted by modified Magnin-Kurz model and Jackson-Hunt model, both for “Chinese script” irregular eutectic and rod-like regular eutectic, respectively.

KW - Directional solidification

KW - Eutectic spacing

KW - Laser floating zone melting

KW - Morphology transition

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U2 - 10.1016/j.jeurceramsoc.2019.05.014

DO - 10.1016/j.jeurceramsoc.2019.05.014

M3 - 文章

AN - SCOPUS:85065837550

SN - 0955-2219

VL - 39

SP - 3837

EP - 3842

JO - Journal of the European Ceramic Society

JF - Journal of the European Ceramic Society

IS - 13

ER -

Theoretical prediction and experimental comparison for eutectic growth of Al₂O₃/GdAlO₃ faceted eutectics

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Keywords

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