Formation mechanism of a wrinkled and textured Al2O3‐ZrO2 nanoeutectic rapidly solidified from oxy‐acetylene flame remelting

• Published in: Journal of the American Ceramic Society 2019-01, Vol.102 (1), p.63-69
• Main Authors: Wang, Zhi‐Gang, Ouyang, Jia‐Hu, Ma, Yong‐Hui, Wang, Yu‐Jin, Liu, Zhan‐Guo, Xie, Ling‐Yun, Sun, De‐Shun, Wang, Ya‐Ming
• Format: Article
• Language: English
• Subjects: Acetylene; Air flow; Al2O3‐ZrO2 ceramic; Aluminum oxide; Cellular structure; Crystal growth; Crystal structure; Eutectics; Mathematical models; Melting; nanoeutectic; Orientation effects; oxy‐acetylene flame; surface remelting; wrinkled texture; Zirconium dioxide
• ISSN: 0002-7820; 1551-2916
• DOI: 10.1111/jace.16003

A highly wrinkled and textured Al2O3‐ZrO2 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 Al2O3‐ZrO2 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 Al2O3‐ZrO2 nanoeutectic induced by oxy‐acetylene flame remelting than the Trivedi‐Magnin‐Kurz (TMK) model. The bulk growth rate of 7.8 μm3/s is close to the theoretically predicted value of 11.0 μm3/s by the JH model. The eutectic growth rates of Al2O3‐ZrO2 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. The formation mechanism and epitaxial growth behavior of a novel wrinkled and textured Al2O3‐ZrO2 nanoeutectic.