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The hardness and Young's modulus of bulk YBa2Cu3O7−x (1:2:3) and YBa2Cu4O8 (1:2:4) as determined by ultra low load indentation

Published online by Cambridge University Press:  31 January 2011

B.N. Lucas ,
W.C. Oliver ,
R.K. Williams ,
J. Brynestad  and
M.E. O'Hern
B.N. Lucas
Affiliation:
University of Tennessee, Knoxville, Tennessee
W.C. Oliver
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831–6116
R.K. Williams
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831–6116
J. Brynestad
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831–6116
M.E. O'Hern
Affiliation:
Nano Instruments, Inc., Knoxville, Tennessee
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Abstract

Using a highly-spatially-resolved mechanical properties microprobe, the Young's modulus and hardness of bulk YBa2Cu3O7−x (1:2:3) and YBa2Cu4O8 (1:2:4) have been determined. The Young's modulus of a superconductor is an important parameter in determining critical grain sizes above which microcracking will occur due to anisotropic thermal stresses that arise during processing. This phenomenon of microcracking has been determined to cause a decrease in the attainable critical current densities in bulk superconductors. The mechanical properties data for these two materials show that the Young's modulus of 1:2:3 is approximately 35% greater than the modulus of 1:2:4. This along with available anisotropic thermal expansion data for 1:2:3 and 1:2:4 suggests that the critical grain size for 1:2:4 is about 7 times greater than the critical grain size for microcracking in 1:2:3.

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Type
Articles
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Journal of Materials Research , Volume 6 , Issue 12 , December 1991 , pp. 2519 - 2522
Copyright
Copyright © Materials Research Society 1991

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