Paper Title:
Failure Mechanisms in Directionally Solidified Alumina-Titania Composites
  Abstract

The mechanical properties of directionally solidified two-phase eutectics can be superior to that of either constituent alone due to the strong constraining effects of the interlocking microstructure. The present work focuses on the failure mechanisms that occur in Al2O3-Al2TiO5 composites fabricated by directional solidification. Two compositions rich in alumina have been considered. The constituents were the same in both materials, primary Al2O3 dendrites surrounded by a TiO2-containing phase, with different morphological and size characteristics. The dendrites in the material containing the smallest amount of Al2O3 were short and highly interpenetrated by the secondary phase whereas those of the material with the highest Al2O3 content were long and much less interpenetrated. The mechanical behaviour in bending was determined by these microstructural differences because the load bearing phase in these directionally solidified materials in the system Al2O3-Al2TiO5 are the Al2O3 dendrites.

  Info
Periodical
Edited by
J. Dusza, R. Danzer and R. Morrell
Pages
199-202
DOI
10.4028/www.scientific.net/KEM.290.199
Citation
C. Baudín, A. Sayir, M. H. Berger, "Failure Mechanisms in Directionally Solidified Alumina-Titania Composites", Key Engineering Materials, Vol. 290, pp. 199-202, 2005
Online since
July 2005
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Y. Lu, H.C. Kim, Je Hyun Lee, Myung Hoon Oh, Dang Moon Wee, Toshiyuki Hirano
Abstract:Directional or single crystal technique was applied to enhance the ductility, and two phases of γ (Ni) phase or β (NiAl) phase in γ‘(Ni3Al)...
458
Authors: Y. Lu, Je Hyun Lee, Y.H. Jang, S.S. Kim, Myung Hoon Oh, Dang Moon Wee
Abstract:Ni3Al shows the unique feature of increasing strength with increasing temperature. However, it is too brittle to use as a structural...
71
Authors: Shuang Ming Li, Bing Lun Jiang, Heng Zhi Fu
Abstract:At normal solidification conditions, in-situ composites of a Ni-24.8%Nb hypereutectic alloy can be produced at growth velocities below 5μm/s,...
1351
Authors: Zhi Ming Zhou, Wei Jiu Huang, Li Wen Tang, Xiao Ping Li, Jing Luo, Tao Zhou, Jie Zhan, Cheng Yun Peng
Abstract:The microstructure of Cu75Cr25 alloys was investigated by using vacuum non-consumable arc melting, electromagnetic...
247
Authors: Zhi Ming Zhou, Li Wen Tang, Wei Jiu Huang, Jian Jun Hu, Tao Zhou, Kang Chen, Cheng Yun Peng, Hua Xia
Abstract:Microstructure of Cr-rich phase in undercooled hypereutectic Cu95Cr5 alloys was studied by using arc melting,...
691