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Sibley School of Mechanical and Aerospace Engineering

New article: Determining Heterogeneous Slip Activity on Multiple Slip Systems from Single Crystal Orientation Pole Figures

Article:  Pagan, DC; Miller, MP; “Determining Heterogeneous Slip Activity on Multiple Slip Systems from Single Crystal Orientation Pole Figures”, ACTA Materialia, 116:200-211

DOI

Abstract:  A new experimental method to determine heterogeneity of shear strains associated with crystallographic slip in the bulk of ductile, crystalline materials is outlined. The method quantifies the time resolved evolution of misorientation within plastically deforming crystals using single crystal orientation pole figures (SCPFs) measured in-situ with X-ray diffraction. A multiplicative decomposition of the crystal kinematics is used to interpret the distributions of lattice plane orientation observed on the SCPFs in terms of heterogeneous slip activity (shear strains) on multiple slip systems. To show the method’s utility, the evolution of heterogeneous slip is quantified in a silicon single crystal plastically deformed at high temperature at multiple load steps, with slip activity in sub-volumes of the crystal analyzed simultaneously. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd.  All rights reserved.

Funding Acknowledgement:  National Science Foundation; National Institutes of Health/National Institute of General Medical Sciences under NSF [DMR-1332208]; National Science Foundation (NSF) [CMMI-0928257]; U.S. Department of Energy by Lawrence Livermore National Laboratory [DE-AC52-07NA27344 (LLNL-JRNL-679683)]

Funding Text:  The experiment was conducted at the Cornell High Energy Synchrotron Source (CHESS), which is supported by the National Science Foundation and the National Institutes of Health/National Institute of General Medical Sciences under NSF Award No. DMR-1332208. Darren Pagan was supported by by the National Science Foundation (NSF) under award No. CMMI-0928257 and a GRA position at CHESS. This work was performed partially under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344 (LLNL-JRNL-679683). The authors wish to thank Professors Paul Dawson and Armand Beaudoin for many helpful discussions and guidance, Mark Obstalecki for help performing the silicon compression experiment, and Dr. Jacob Ruff for his support as staff scientist at the A-2 station at CHESS.

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