Hostname: page-component-586b7cd67f-gb8f7 Total loading time: 0 Render date: 2024-11-28T10:49:29.521Z Has data issue: false hasContentIssue false
  • English
  • Français

Pressure-Induced Nano-Crystallization of Y2O3

Published online by Cambridge University Press:  24 March 2011

Stuart Deutsch ,
Jafar F. Al-Sharab ,
Bernard H. Kear  and
Stephen D. Tse
Stuart Deutsch
Affiliation:
Department of Materials Science & Engineering, Rutgers University 607 Taylor Rd. Piscataway, NJ 08854
Jafar F. Al-Sharab
Affiliation:
Department of Materials Science & Engineering, Rutgers University 607 Taylor Rd. Piscataway, NJ 08854
Bernard H. Kear
Affiliation:
Department of Materials Science & Engineering, Rutgers University 607 Taylor Rd. Piscataway, NJ 08854
Stephen D. Tse
Affiliation:
Department of Materials Science & Engineering, Rutgers University 607 Taylor Rd. Piscataway, NJ 08854
Get access

Abstract

A reversible-phase transformation process to convert coarse-grained polycrystalline cubic-Y2O3 directly into the nanocrystalline state is being developed. The process involves a forward cubic-to-monoclinic phase transition under high pressure and a backward transformation from monoclinic-to-cubic under a lower pressure. The process has been used to reduce the grain size of fully dense cubic-Y2O3 from 300 μm to 0.1 μm. A surface modification effect, comprising a columnar-grained structure, has also been observed. Preliminary work indicates that the surface structure is modified, apparently formed by interaction between the graphite heater and sample.

Keywords

phase transformationgrain sizemicrostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1297: Symposium P – Deformation Mechanisms, Microstructure Evolution and Mechanical Properties of Nanoscale Materials , 2011 , mrsf10-1297-p10-06
Copyright
Copyright © Materials Research Society 2011

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Harris, D. C., “Materials for Infrared Windows and Domes: Properties and Performance,” SPIE Press Monograph Vol. PM70, 1999.Google Scholar
2. Rice, R. W., “Review: ceramic tensile Strenght-Grain Size Relations: Grain Sizes, Slopes, and Branch Intersections,” J. Mater. Sci. Eng., A204, 152–9 (1995).Google Scholar
3. Kear, B.H., Sadangi, R.K., Al-Sharab, J.F., Deutsch, S., Kavukcuoglu, B., Tse, S.D. and Mann, A.B., Voronov, O.A., Nordahl, C.S., “Grain Size Reduction in Y2O3 via a Reversible Phase Transformation Mechanism," Journal of the American Ceramic Society (accepted).Google Scholar
4. Al-Sharab, J.F., Kear, B.H., Deutsch, S. and Tse, S.D., “Characterization and Nanoscale Strain Analysis of Surface Modified Layer in Y2O3,” Microscopy and Microanalysis, 16 (Suppl 2), 1278–1279 (2010).Google Scholar