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Title: Modeling slip system strength evolution in Ti-7Al informed by in-situ grain stress measurements

Abstract

In this work, far-field high-energy X-ray diffraction microscopy is used to asses the evolution of slip system strengths in hexagonal close-packed (HCP) Ti-7Al during tensile deformation in-situ. The following HCP slip system families are considered: basal $$\langle$$a$$\rangle$$, prismatic $$\langle$$a$$\rangle$$, pyramidal$$\langle$$a$$\rangle$$, and first-order pyramidal $$\langle$$c + a$$\rangle$$. A 1 mm length of the specimen's gauge section, marked with fiducials and comprised of an aggregate of over 500 grains, is tracked during continuous deformation. The response of each slip system family is quantified using ‘slip system strength curves’ that are calculated from the average stress tensors of each grain over the applied deformation history. These curves, which plot the average resolved shear stress for each slip system family versus macroscopic strain, represent a mesoscopic characterization of the aggregate response. A short time-scale transient softening is observed in the basal $$\langle$$a$$\rangle$$, prismatic $$\langle$$a$$\rangle$$, and pyramidal $$\langle$$a$$\rangle$$ slip systems, while a long time-scale transient hardening is observed in the pyramidal $$\langle$$c + a$$\rangle$$ slip systems. These results are used to develop a slip system strength model as part of an elasto-viscoplastic constitutive model for the single crystal behavior. A suite of finite element simulations is performed on a virtual polycrystal to demonstrate the relativemore » effects of the different parameters in the slip system strength model. The model is shown to accurately capture the macroscopic stress-strain response using parameters that are chosen to capture the mesoscopic slip system responses.« less

Authors:
 [1];  [2];  [1];  [3];  [3];  [4];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Air Force Research Lab. (AFRL), Wright-Patterson AFB, OH (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  4. Carnegie Mellon Univ., Pittsburgh, PA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Under Secretary for Energy; Air Force Research Laboratory (AFRL). Materials and Manufacturing Directorate; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
OSTI Identifier:
1781294
Alternate Identifier(s):
OSTI ID: 1372694; OSTI ID: 1397848
Report Number(s):
LLNL-JRNL-703660
Journal ID: ISSN 1359-6454; 836747
Grant/Contract Number:  
AC52-07NA27344; AC02-06CH11357; LLNL-JRNL-703660
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 128; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Titanium; Diffraction; Slip system strength; Crystal plasticity

Citation Formats

Pagan, Darren C., Shade, Paul A., Barton, Nathan R., Park, Jun-Sang, Kenesei, Peter, Menasche, David B., and Bernier, Joel V. Modeling slip system strength evolution in Ti-7Al informed by in-situ grain stress measurements. United States: N. p., 2017. Web. doi:10.1016/j.actamat.2017.02.042.
Pagan, Darren C., Shade, Paul A., Barton, Nathan R., Park, Jun-Sang, Kenesei, Peter, Menasche, David B., & Bernier, Joel V. Modeling slip system strength evolution in Ti-7Al informed by in-situ grain stress measurements. United States. https://doi.org/10.1016/j.actamat.2017.02.042
Pagan, Darren C., Shade, Paul A., Barton, Nathan R., Park, Jun-Sang, Kenesei, Peter, Menasche, David B., and Bernier, Joel V. 2017. "Modeling slip system strength evolution in Ti-7Al informed by in-situ grain stress measurements". United States. https://doi.org/10.1016/j.actamat.2017.02.042. https://www.osti.gov/servlets/purl/1781294.
@article{osti_1781294,
title = {Modeling slip system strength evolution in Ti-7Al informed by in-situ grain stress measurements},
author = {Pagan, Darren C. and Shade, Paul A. and Barton, Nathan R. and Park, Jun-Sang and Kenesei, Peter and Menasche, David B. and Bernier, Joel V.},
abstractNote = {In this work, far-field high-energy X-ray diffraction microscopy is used to asses the evolution of slip system strengths in hexagonal close-packed (HCP) Ti-7Al during tensile deformation in-situ. The following HCP slip system families are considered: basal $\langle$a$\rangle$, prismatic $\langle$a$\rangle$, pyramidal$\langle$a$\rangle$, and first-order pyramidal $\langle$c + a$\rangle$. A 1 mm length of the specimen's gauge section, marked with fiducials and comprised of an aggregate of over 500 grains, is tracked during continuous deformation. The response of each slip system family is quantified using ‘slip system strength curves’ that are calculated from the average stress tensors of each grain over the applied deformation history. These curves, which plot the average resolved shear stress for each slip system family versus macroscopic strain, represent a mesoscopic characterization of the aggregate response. A short time-scale transient softening is observed in the basal $\langle$a$\rangle$, prismatic $\langle$a$\rangle$, and pyramidal $\langle$a$\rangle$ slip systems, while a long time-scale transient hardening is observed in the pyramidal $\langle$c + a$\rangle$ slip systems. These results are used to develop a slip system strength model as part of an elasto-viscoplastic constitutive model for the single crystal behavior. A suite of finite element simulations is performed on a virtual polycrystal to demonstrate the relative effects of the different parameters in the slip system strength model. The model is shown to accurately capture the macroscopic stress-strain response using parameters that are chosen to capture the mesoscopic slip system responses.},
doi = {10.1016/j.actamat.2017.02.042},
url = {https://www.osti.gov/biblio/1781294}, journal = {Acta Materialia},
issn = {1359-6454},
number = ,
volume = 128,
place = {United States},
year = {Fri Feb 17 00:00:00 EST 2017},
month = {Fri Feb 17 00:00:00 EST 2017}
}

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