Issue 60, 2015

Learning about the nucleation pathway of MgO·Al2O3 spinel from an Fe–O–Al–Mg melt using a two-step nucleation mechanism

Abstract

The crystallization process from a melt begins with nucleation, which determines the structure and size of the resulting crystal embryos. Further understanding of multi-pathway crystallizations from a melt through two-step nucleation mechanisms is needed. The formation mechanism of MgO·Al2O3, which sheds light on the metastable structures or pathways leading from the molten steel to the solid crystal, was analyzed to improve the understanding of the fundamentals of MgO·Al2O3 spinel inclusion. Here a pathway of formation that derives from a variety of metastable structures in earlier crystal nucleation stages was discovered, which drives the formation of MgO·Al2O3 more strongly than the traditional mechanism in which it originates from oxide-based inclusions (MgO/α-Al2O3). This study uncovers the behavior of the early stages of inclusions crystallization in steels, extends the classical MgO·Al2O3 formation theory and highlights the possible pathway to form MgO·Al2O3.

Graphical abstract: Learning about the nucleation pathway of MgO·Al2O3 spinel from an Fe–O–Al–Mg melt using a two-step nucleation mechanism

Article information

Article type
Paper
Submitted
28 Feb 2015
Accepted
08 May 2015
First published
29 May 2015

RSC Adv., 2015,5, 48382-48390

Learning about the nucleation pathway of MgO·Al2O3 spinel from an Fe–O–Al–Mg melt using a two-step nucleation mechanism

N. Zong, Y. Liu and P. He, RSC Adv., 2015, 5, 48382 DOI: 10.1039/C5RA03611A

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