摘要
The crystallization process of the eutectic composition of GdAlO_3-Al_2O_3 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 °C and 1500 °C for up to 30min to form the eutectic phases of GdAlO_3 and Al_2O_3.The GdAlO_3 and Al_2O_3 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 GdAlO_3-Al_2O_3 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 °C for either 2 min,8min or 30min,the ultra-fine components of GdAlO_3 and Al_2O_3 were found to crystallize following a eutectic-like stage after 8min of heat treatment.
The crystallization process of the eutectic composition of GdAlO<sub>3</sub>-Al<sub>2</sub>O<sub>3</sub> 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 °C and 1500 °C for up to 30min to form the eutectic phases of GdAlO<sub>3</sub> and Al<sub>2</sub>O<sub>3</sub>.The GdAlO<sub>3</sub> and Al<sub>2</sub>O<sub>3</sub> 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 GdAlO<sub>3</sub>-Al<sub>2</sub>O<sub>3</sub> 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 °C for either 2 min,8min or 30min,the ultra-fine components of GdAlO<sub>3</sub> and Al<sub>2</sub>O<sub>3</sub> were found to crystallize following a eutectic-like stage after 8min of heat treatment.
出处
《中国有色金属学会会刊：英文版》
CSCD
2012年第S3期579-584,共6页
Transactions of Nonferrous Metals Society of China
基金
part of the study under the "Human Resource Development Center for Economic Region Leading Industry" Project
supported by the Ministry of Education,Science & Technology(MEST)
by the National Research Foundation of Korea(NRF)
