Paper Title:
Superplastic Extrusion of Al2O3-YTZ Nanocomposite and Its Deformation Mechanism
  Abstract

Using Al2O3-YTZ(3mol% yttria stabilized tetragonal zirconia) nanocomposite, superplastic extrusion under different conditions was adopted to form blade models. The results demonstrate that desired microstructure is achieved through the addition of 20mol% YTZ which acts as a second-phase pinning agent. At temperature range of 1650°C to 1700°C the material shows good deformability. At this elevated temperature the maximum extrusion pressure is lower than 25MPa, and the maximum punch speed is about 0.35mm·min-1. In superplastic extrusion the dominating deformation mechanism is grain sliding and rotation, the accommodating mechanism is intergranular zirconia coordinated deformation. Meanwhile static and dynamic grain growth also plays an important role in deformation.

  Info
Periodical
Materials Science Forum (Volumes 475-479)
Main Theme
Edited by
Z.Y. Zhong, H. Saka, T.H. Kim, E.A. Holm, Y.F. Han and X.S. Xie
Pages
2973-2976
DOI
10.4028/www.scientific.net/MSF.475-479.2973
Citation
G. Q. Chen, K. F. Zhang, "Superplastic Extrusion of Al2O3-YTZ Nanocomposite and Its Deformation Mechanism", Materials Science Forum, Vols. 475-479, pp. 2973-2976, 2005
Online since
January 2005
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$32.00
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