Modeling the role of local crystallographic correlations in microstructures of Ti-6Al-4V using a correlated structure visco-plastic self-consistent polycrystal plasticity formulation

Riyad, Iftekhar A.; Feather, William G.; Vasilev, Evgenii; Lebensohn, Ricardo A.; McWilliams, Brandon A.; Pilchak, Adam L.; Knezevic, Marko

doi:10.1016/j.actamat.2020.116502

Title: Modeling the role of local crystallographic correlations in microstructures of Ti-6Al-4V using a correlated structure visco-plastic self-consistent polycrystal plasticity formulation

Journal Article · Fri Nov 20 00:00:00 EST 2020 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2020.116502· OSTI ID:1835771

Riyad, Iftekhar A. ^[1]; Feather, William G. ^[1];

^[1];

^[2]; McWilliams, Brandon A. ^[3]; Pilchak, Adam L. ^[4]; Knezevic, Marko ^[1]

Univ. of New Hampshire, Durham, NH (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Army Research Lab., Adelphi, MD (United States)
Air Force Research Lab. (AFRL), Wright-Patterson AFB, OH (United States)

This paper presents a multi-level crystal plasticity-based simulation framework for modeling mechanical response and microstructure evolution of Ti-6Al-4V with α-lath/lamellar microstructures. Here, the model is a correlated structure visco-plastic self-consistent (CS-VPSC) formulation linking three scales: a single crystals micro-scale, a lath/lamellar colony meso-scale, and a lath/lamellar aggregate macro-scale. A selected hardening law for the evolution of critical resolved shear stress per slip system used in CS-VPSC is phenomenological. However, it adjusts the resistances of basal and prismatic slip systems based on the geometry of slip transfer between adjacent lamellae. Consistent with experimental evidences, the resolved shear stress on the pyramidal slip planes is dependent not only on the stress in the direction of slip but also on the two orthogonal shear stress components and the three normal stress components (non-Schmid effects). Electron backscatter diffraction (EBSD) data in conjunction with a procedure relying on α→β phase transformation is used to construct paired variants of α-laths/lamellae satisfying their local crystallographic correlations. The procedure fits volume fractions of individual laths/lamellae with the experimental EBSD data and selects a distribution of habit planes between adjacent variants with respect to the loading direction. The simulation framework is applied to interpret the deformation behavior in tension and compression along two sample directions of Ti-6Al-4V fabricated via laser powder bed fusion. Moreover, the model is used to simulate texture evolution during rolling of the material to large strains. It is demonstrated that the model is capable of predicting plastic anisotropy/asymmetry and the concomitant texture evolution. While the model reveals a significant effect of habit plane inclination with respect to the loading direction on yield stress, the comparison of the data and model predictions shows that a random distribution of habit planes fits the flow response. It is further inferred that the tension-compression asymmetry arises from the non-Schmid effects.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE; US Army Research Laboratory (USARL)

Grant/Contract Number:: 89233218CNA000001; W911NF-15-2-0084

OSTI ID:: 1835771

Report Number(s):: LA-UR-20-26185

Journal Information:: Acta Materialia, Vol. 203; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Modeling the role of local crystallographic correlations in microstructures of Ti-6Al-4V using a correlated structure visco-plastic self-consistent polycrystal plasticity formulation

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