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Instrumented indentation probing of laser surface-refined cast Al alloy

Published online by Cambridge University Press:  03 March 2011

S. Nayak ,
Laura Riester  and
Narendra B. Dahotre
S. Nayak
Affiliation:
Department of Materials Science and Engineering, Center for Laser Applications, University of Tennessee, Knoxville, Tennessee 37996
Laura Riester
Affiliation:
High Temperature Materials Laboratory, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
Narendra B. Dahotre
Affiliation:
Department of Materials Science and Engineering, Center for Laser Applications, University of Tennessee, Knoxville, Tennessee 37996; and Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
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Abstract

The surface layer of A319 alloy was refined by selective remelting using laser energy. Instrumented indentation technique was used to measure hardness (H) and elastic modulus (E) of the laser-melted layer. Berkovich tip was used to indent the material for 100-nm, 200-nm, 500-nm, and 1000-nm depths. The H and the E were found to be 1.22 GPa and 78.2 GPa, respectively, for 1000-nm indentation depths. The variances associated with H and E were minimal, whereas, the same for substrate possessed significant scattering. Also, H and E increased with decreasing depth of indentation. Closer examination suggested that when the heterogeneity in the material was in the scale of indentation depth, significant scattering took place and the hard phase Si influenced the average hardness. However, the influence of indentation depth on elastic modulus was not statistically significant.

Keywords

LaserCompositeNanoindentation
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 1 , January 2004 , pp. 202 - 207
Copyright
Copyright © Materials Research Society 2004

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