1. Nucleation and epitaxial growth of highly textured Al2O3–ZrO2 nanoeutectic rapidly solidified from oxyacetylene flame remelting.
- Author
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Wang, Zhi-Gang, Ouyang, Jia-Hu, Wang, Yu-Jin, Liu, Zhan-Guo, Ma, Yong-Hui, and Xie, Ling-Yun
- Subjects
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ALUMINUM oxide , *ZIRCONIUM oxide , *CERAMICS , *SOLIDIFICATION , *EPITAXY , *NUCLEATION , *METAL analysis - Abstract
Abstract The nucleation and epitaxial growth behavior of a novel Al 2 O 3 -ZrO 2 nanoeutectic rapidly solidified from the oxyacetylene flame remelting have been investigated. The nanoeutectic ceramic consists mainly of highly textured cellular structure with an average interphase spacing of 136 nm. Especially, a singular transition mechanism associated with " one-step cellular refining " to " two-step cellular refining " is proposed in a variable region from a coarse irregular to an ultrafine lamellar structure, and the regional undercooling is estimated to be 0.57–2.86 K. The Al 2 O 3 phase nucleates as the leading phase in the rapidly solidified structure according to a quantitative calculation of nucleation rate. The cellular eutectic exhibits with a tilted feature, where its cellular growth deviates from the heat flow direction to a preferred growth orientation. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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