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

17 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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10.1016/j.jeurceramsoc.2019.05.014

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@article{853086c69abc49ff96fb78197337b8a4,

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",

issn = "0955-2219",

publisher = "Elsevier B.V.",

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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

UR - https://www.scopus.com/pages/publications/85065837550

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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