Directional Solidification and Characterization of Al2O3/Er3Al5O12 Eutectic In Situ Composite by Laser Zone Remelting

Hai Jun Su; Jun Zhang; Yang Fang Deng; Kan Song; Lin Liu; Heng Zhi Fu

doi:10.4028/www.scientific.net/MSF.654-656.1347

Paper Titles

Study on Powder Metallurgical Preparation of NiCoMnIn Alloy Foam
p.1331

Optimization of the Cooling Process of a Heavy Hydraulic Turbine Runner Band Casting in Heat Treatment
p.1335

Heterogeneous Nucleation and Grain Formation on Spherical and Flat Substrates
p.1339

Researches on the Nucleation Behaviors of NH4Cl Crystal on Coarse Aluminum Surfaces
p.1343

Directional Solidification and Characterization of Al₂O₃/Er₃Al₅O₁₂ Eutectic In Situ Composite by Laser Zone Remelting
p.1347

Microstructure Evolution and Compression Properties of a Directionally Solidified Ni-24.8%Nb Hypereutectic Alloy
p.1351

The Contribution of Diffusion Coefficient to the Eutectic Instability and Amorphous Phase Formation
p.1355

Analysis of an Equiaxed Dendrite Growth Model with Comparisons to In-Situ Results of Equiaxed Dendritic Growth in an Al-Ge Alloy
p.1359

Modelling and Experiments Concerning Dendrite Re-Melting and Its Role in Microstructural Evolution in Spray Formed Ni Superalloys
p.1363

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Directional Solidification and Characterization of Al₂O₃/Er₃Al₅O₁₂ Eutectic In Situ Composite by Laser Zone Remelting

Abstract:

Directionally solidified (DS) oxide eutectic in situ composites are attracting increasing attention because of their unique properties and potential applications to high temperature structural materials, optical or electronic devices. Among the alumina-based eutectic composites, DS Al2O3/Er3Al5O12(EAG) eutectic is considered to be promising candidate for use as selective emitter at high temperature. In this work, eutectic in situ composites of Al2O3/EAG rods having smooth surface and full density are successfully prepared by directional solidification using the laser zone remelting method, aiming to investigate the growth characteristic of this novel binary eutectic under high temperature gradient. The microstructure is investigated by scanning electron microscopy (SEM), energy disperse spectroscopy (EDS) and X-ray diffraction (XRD). The Al2O3/EAG eutectic presents a very fine irregular network structure consisting of only -Al2O3 and Er3Al5O12 phases without grain boundaries and amorphous phases between interfaces. The eutectic interphase spacing is strongly dependent on the laser scanning rate, rapidly decreasing at the sub-micron levels for the samples grown at high rate. Furthermore, the microstructural formation and evolution of the composite are analyzed and discussed.