Premium
Formation mechanism of a wrinkled and textured Al 2 O 3 ‐ZrO 2 nanoeutectic rapidly solidified from oxy‐acetylene flame remelting
Author(s) -
Wang ZhiGang,
Ouyang JiaHu,
Ma YongHui,
Wang YuJin,
Liu ZhanGuo,
Xie LingYun,
Sun DeShun,
Wang YaMing
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16003
Subject(s) - eutectic system , interphase , materials science , acetylene , morphology (biology) , crystallography , chemical engineering , composite material , microstructure , chemistry , geology , organic chemistry , engineering , paleontology , genetics , biology
A highly wrinkled and textured Al 2 O 3 ‐ZrO 2 nanoeutectic induced by oxy‐acetylene flame remelting was elaborated for the first time from the perspective of morphological evolution and formation mechanism. The rapidly solidified Al 2 O 3 ‐ZrO 2 ceramic exhibits a wrinkled cellular nanoeutectic structure with a minimum interphase spacing of 0.12 μm. The Jackson‐Hunt (JH) eutectic theory is more appropriate to predict the growth of Al 2 O 3 ‐ZrO 2 nanoeutectic induced by oxy‐acetylene flame remelting than the Trivedi‐Magnin‐Kurz (TMK) model. The bulk growth rate of 7.8 μm 3 /s is close to the theoretically predicted value of 11.0 μm 3 /s by the JH model. The eutectic growth rates of Al 2 O 3 ‐ZrO 2 with average interphase spacings of 0.12 and 0.3 μm are estimated to be 763.8 and 122.2 μm/s, respectively. Especially, a mesoscopic insight into formation mechanism of the wrinkled and textured eutectic was proposed from a three‐dimensional perspective based on both the crystal growth orientation and the airflow effect.