研究目的
To explore microstructure control, competitive growth, and precipitation rule in faceted Al2O3/Er3Al5O12 eutectic in situ composite ceramics prepared by laser floating zone melting.
研究成果
The study successfully explores the microstructure control, competitive growth, and precipitation rule in Al2O3/Er3Al5O12 eutectic ceramics. It demonstrates the possibility of obtaining complete eutectic microstructures at off-eutectic compositions under fast solidification rates and discusses the transformation from irregular to regular eutectic microstructures with refined spacings.
研究不足
The study is limited by the complex solidification conditions and the anisotropic growth behaviors of the constituent phases, which may affect the uniformity and predictability of microstructure formation.
1：Experimental Design and Method Selection:
The study involves directional solidification of Al2O3/Er3Al5O12 eutectic/off-eutectics using laser floating zone melting (LFZM) with ultra-high temperature gradient (~5 × 103 K/cm).
2：Sample Selection and Data Sources:
High purity commercial powders of α-Al2O3 and Er2O3 are mixed at eutectic and off-eutectic compositions.
3：List of Experimental Equipment and Materials:
LFZM apparatus, X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), back-scattered scanning electron microscopy (SEM).
4：Experimental Procedures and Operational Workflow:
Preparation of precursor bars, directional solidification by LFZM, phase identification, and microstructure analysis.
5：Data Analysis Methods:
Measurement of eutectic spacing using Image-Pro Plus 6.0 software, comparison of interface temperatures using MK model and BH model.
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