Microstructure evolution and crystallography of directionally solidified Al2O3/Y3Al5O12 eutectic ceramics prepared by the modified Bridgman method. Issue 9 (September 2019)

• Record Type: Journal Article
• Authors: Wang, Xu; Zhang, Nan; Zhong, Yujie; Jiang, Bailing; Lou, Langhong; Zhang, Jian; Wang, Jingyang
• Is Part Of: Journal of materials science & technology. Volume 35:Issue 9(2019)
• Page Start: 1982
• Page End: 1988
• Publication Date: 2019-09
• Subjects: Al2O3/YAG eutectic ceramics -- Crystallography -- Interfaces -- Bridgman method; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2019.05.018
• Languages: English
• ISSNs: 1005-0302

Abstract

Abstract: Large size, high-density (99.97%) and well-organized Al2 O3 /Y3 Al5 O12 (YAG) eutectic ceramics were prepared by the modified Bridgman method. The evolution of the three dimensional microstructure and micropores were investigated. The diameter of the micro-pores and the porosity decreased during directional solidification. The average equivalent diameter of the micro-pores was 2.41 μm in the well-prepared eutectic ceramics. Most of the pores (98.07%) were smaller than 4 μm. These data are comparable to those prepared by the optical floating zone method. The as-grown eutectic ceramics were polycrystalline, but the interfaces were well-bonded and there were no amorphous phases in the microstructure. The misfits of the different crystallographic relationships were calculated, and the bottleneck of the single-crystal preparation was identified. These results could provide theoretical guidance for the preparation of large, single-crystal Al2 O3 /YAG eutectic ceramics by the modified Bridgman method.