Bilinear Behavior in Nano and Microindentation Tests of fcc Polycrystalline Materials

[+] Author and Article Information
A. A. Elmustafa

Department of Mechanical and Aerospace Engineering, Princeton Institute of Science and Technology of Materials, Princeton University, Princeton, NJ  

A. A. Ananda

NASA Langley Research Center-ConITS, Hampton, VA

W. M. Elmahboub

Department of Mathematics, School of Science, Hampton University, Hampton, VA

J. Eng. Mater. Technol 126(4), 353-359 (Nov 09, 2004) (7 pages) doi:10.1115/1.1789962 History: Received September 05, 2003; Revised March 24, 2004; Online November 09, 2004
Copyright © 2004 by ASME
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Grahic Jump Location
Hardness vs. load for annealed and work-hardened α-brass. The data includes nanohardness and microhardness measurements.
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Circular prismatic dislocation loops injected inside a three-sided Berkovich pyramidal indentation for work hardened mechanically polished α-brass samples. Image represents SEM micrograph.
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3D circular prismatic dislocation loops in a three-sided Berkovich indentations
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H12/C12 versus 1/D, for α-brass, OFC, and iridium samples
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Comparison of measured areas based on electron and optical microscopy and areas based on contact stiffness. The solid line represents A(stiffness)=A(optical). The best fit to the data is a line of slope of 1.03 (dotted line).
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Geometry of injected geometrically necessary circular dislocation (GNDs) loops in indentation testing
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Normalized shear stress, τxz, versus x/R for prismatic circular dislocation loops for indentations at onset of bilinear behavior and shallow depth of indentation for annealed and work hardened α-brass samples
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Normalized shear stress, τXZ, versus depth for prismatic circular dislocation loops for α-brass, and OFC at deep, onset of bilinear behavior, and shallow depth of indentation



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