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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
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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

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References

REFERENCES

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