Paper Title:
Effect of Second Sintering on Intragranular Structure and Mechanical Properties of 10vol%Al2O3/3Y-TZP Composites
  Abstract

To study the effect of second sintering on intragranular structure and mechanical properties of 10vol%Al2O3/3Y-TZP composites, the composites were prepared by ball-milling nano-γ-Al2O3 and nano-ZrO2(3mol%Y2O3), pressing unidirectionally, cold-pressing isostatically, then first sintering at 1400°C for 2h and second sintering at 1600°C for 5h in air. The composition and microstructure of the composites were examined by X-ray diffractometer and scanning electron microscope, transmission electron microscope. The results showed that the second sintering changed the microstructure and fracture mode. After second sintering, the structure of fine grains was changed into the mixed one of large grains and small grains . Many large grains contained small grains, forming intragranular stucture that could be produced by the interblending of not only Al2O3 and ZrO2 but also ZrO2 itself. The intergranular fracture after first sintering was changed into transgranular fracture and intergranular fracture after second sintering . The second sintering led to grinds growing up and intragranular forming, which enhanced the contribution of the phase transformation toughening. Although the second sintering resulted in abnormal increase of grain size, the fracture strength and the fracture toughness of the composite were 667 MPa and 12.9 MPa⋅m1/2, respectively, due to the intragranular structure and the enhanced phase transformation toughening.

  Info
Periodical
Key Engineering Materials (Volumes 336-338)
Edited by
Wei Pan and Jianghong Gong
Pages
1324-1326
DOI
10.4028/www.scientific.net/KEM.336-338.1324
Citation
X. H. Li, R. L. Men, G. W. Suo, Z. F. Yang, "Effect of Second Sintering on Intragranular Structure and Mechanical Properties of 10vol%Al2O3/3Y-TZP Composites", Key Engineering Materials, Vols. 336-338, pp. 1324-1326, 2007
Online since
April 2007
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: Norihito Tanaka, Tohru Sekino, Tadachika Nakayama, Yamato Hayashi, Takafumi Kusunose, Koichi Niihara
Abstract:Y-TZP/TiNi composites were successfully fabricated by reductive sintering process. Mechanical properties of Y-TZP / TiNi composites were much...
366
Authors: Qian Feng, Shao Ming Dong, Yu Sheng Ding, Qing Zhou, Akira Kohyama
Abstract:Chopped fiber and a hybrid reinforcement of chopped and continuous fibers were used for fabricating SiC/SiC composites. Under the selected...
1257
Authors: Maribel L. Saucedo-Muñoz, Toshiyuki Hashida, Yutaka Watanabe, Tetsuo Shoji, Victor M. Lopez-Hirata
Abstract:Three types of austenitic stainless steels JK2, JJ1 and JN1 were isothermally aged at temperatures from 600 to 900°C for 10 to 1000 minutes...
4914
Authors: De Liang Zhang, Hong Bao Yu, Yuong Chen
Abstract:Bulk nanostructured (grain sizes in the range of 50-200nm) and ultrafine structured (grain sizes in the range of 100-500nm) -TiAl based...
149
Authors: Jian Ping Lu
Chapter 3: Iron and Steel
Abstract:The ultra-microduplex structure was fabricated in the high carbon steel with a fully pearlitic structure after severe plastic deformation....
875