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INTRODUCTION

IN polycrystalline materials, mechanical properties are related to textures, especially under plastic deformation: Slip on specific crystallographic planes during the plastic deformation may produce lattice rotations and, hence, develop texture. However, Heidelbach comments that it is not a trivial job to reveal the plastic flow, E-WEN HUANG, Graduate Student, and PETER K. LIAW, Professor and Ivan Racheff Chair of Excellence, are with the Materials Science and Engineering Department, University of Tennessee, Knoxville, TN 37996. ROZALIYA BARABASH, Research Professor, is with the Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, and the Center for Materials Processing, University of Tennessee. Contact e-mail: [email protected] NAN JIA, Lecturer, is with the Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang 110004, P.R. China. YAN-DONG WANG, Professor, is with the Materials Science and Engineering Department, University of Tennessee, and Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University. GENE E. ICE, Group Leader, X-ray Scattering and Microscopy Group, and J. HORTON, Senior Researcher, Alloying Behavior and Design Group, are with the Materials Science and Technology Division, Oak Ridge National Laboratory. BJØRN CLAUSEN, Technical Staff Member and SMARTS Instruments Scientist, is with the Los Alamos Neutron Science Center, Los Alamos National Laboratory, Los Alamos, NM 87545. This article is based on a presentation given in the symposium entitled ‘‘Neutron and X-Ray Studies for Probing Materials Behavior,’’ which occurred during the TMS Spring Meeting in New Orleans, LA, March 9–13, 2008, under the auspices of the National Science Foundation, TMS, the TMS Structural Materials Division, and the TMS Advanced Characterization, Testing, and Simulation Committee. Article published online November 4, 2008 METALLURGICAL AND MATERIALS TRANSACTIONS A

considering the texture development with the microstructure evolution.[1,2] Hill’s[3] and Hutchinson’s[4] selfconsistent (SC) models have been applied very successfully to simulate the micromechanical behavior of polycrystalline materials[5] by the lattice-strain evolution based on neutron-diffraction measurements via the elasto-plastic self-consistent (EPSC) model for several metallic materials.[6,7] The intrinsic assumptions of the EPSC model consider the active inelastic-deformation mechanisms, and, hence, the stiffness/compliance constants are important for simulations.[8–10] The present study extends SC modeling to moderate-to-large deformation strains, considering the grain rotation for describing preferred grain-orientation distributions. In the current work, a visco-plastic self-consistent (VPSC) model is applied to simulate the texture development, based on the measured lattice strains and macrostressmacrostrain responses from a nickel-based alloy. The VPSC model considers the activity of slip systems an