Journal
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
Volume 56, Issue 1, Pages 172-183Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2007.07.006
Keywords
functionally graded materials; indentation and hardness; mechanical testing; nanostructured materials; numerical algorithms
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A systematic study of depth-sensing indentation was performed on nanocrystalline (nc) Ni-W alloys specially synthesized with controlled unidirectional gradients in plastic properties. A yield strength gradient and a roughly constant Young's modulus were achieved in the nc alloys, using electrodeposition techniques. The force vs. displacement response from instrumented indentation experiments matched very well with that predicted from the analysis of Part I of this paper. The experiments also revealed that the pile-up of the graded alloy around the indenter is noticeably higher than that for the two homogeneous reference alloys that constitute the bounding conditions for the graded material. These trends are also consistent with the predictions of the indentation analysis. (c) 2007 Elsevier Ltd. All rights reserved.
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