HR-TEM and FIB-SEM characterization of formation of eutectic-like structure from amorphous GdAlO3-Al2O3 system

Title
HR-TEM and FIB-SEM characterization of formation of eutectic-like structure from amorphous GdAlO3-Al2O3 system
Author(s)
이재형한영환Y. Harada[Y. Harada]J.F. Shackelford[J.F. Shackelford]K. Kakegawa[K. Kakegawa]
Keywords
THERMAL-STABILITY; COMPOSITE; MICROSTRUCTURE; ELECTRICITY; EMISSION; STRENGTH; PHASES
Issue Date
201212
Publisher
ELSEVIER SCIENCE BV
Citation
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA, v.22, pp.S579 - S584
Abstract
The crystallization process of the eutectic composition of GdAlO3-Al2O3 from the amorphous phase prepared by rapid-quenching of melt that leads to the formation of a cantaloupe skin-like microstructure was investigated using focused ion-beam scanning electron microscopy (FIB-SEM) and high-resolution transmission electron microscopy (HR-TEM). The amorphous films were heat-treated at temperatures between 1000 degrees C and 1500 degrees C for up to 30 min to form the eutectic phases of GdAlO3 and Al2O3. The GdAlO3 and Al2O3 crystal phases that formed from the amorphous phase were identified by FIB-SEM and HR-TEM. Both components began to crystallize and grow from the amorphous phase separately at different temperatures. The formation process of these crystal phases was different from that of the ordinary eutectic microstructure solidified from the GdAlO3-Al2O3 system. Therefore, the observed structure is termed "eutectic-like" for distinction. The microstructures formed from the amorphous phases at sufficiently high temperatures consisted of ultra-fine microstructures of individually crystallized components and were similar to ordinary eutectic microstructures. By heat-treating the amorphous films at 1500 degrees C for either 2 min, 8 min or 30 min, the ultra-fine components of GdAlO3 and Al2O3 were found to crystallize following a eutectic-like stage after 8 min of heat treatment.
URI
http://hdl.handle.net/YU.REPOSITORY/26842http://dx.doi.org/10.1016/S1003-6326(12)61769-5
ISSN
1003-6326
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공과대학 > 신소재공학부 > Articles
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