Paper Title:
Superplastic Deformation of Silicon Nitride Nanocomposite at High Strain Rates
  Abstract

High-strain-rate superplasticity and low-temperature superplasticity are favorable for making the use of superplastic forming for engineering ceramics even more wide spread. In this study, a silicon nitride based nanocomposite was developed for the purpose of improving the superplasticity. An amorphous powder was prepared by mechanical alloying of silicon nitride and metal titanium. A Si3N4-Si2N2O-TiN nanocomposite was fabricated by hot isostatically pressing the amorphous powder compact. A compression test was performed in the temperature range of 1573 K to 1873 K. The nanocomposite could be deformed at a strain rate of 10-2s-1, which was more than 100 times faster than that available for conventional superplastic Si3N4 at 1873 K. Furthermore, the nanocomposite was superplastically deformed in compression at low temperatures from 1573 K to 1673 K. The stress exponent and the activation energy of the nanocomposite were close to those of submicron-silicon nitride.

  Info
Periodical
Key Engineering Materials (Volumes 317-318)
Edited by
T. Ohji, T. Sekino and K. Niihara
Pages
403-406
DOI
10.4028/www.scientific.net/KEM.317-318.403
Citation
K. Chihara, Y. Shinoda, T. Akatsu, F. Wakai, "Superplastic Deformation of Silicon Nitride Nanocomposite at High Strain Rates", Key Engineering Materials, Vols. 317-318, pp. 403-406, 2006
Online since
August 2006
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Price
$32.00
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