skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

Journal Article · · Acta Materialia
 [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)

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.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
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
Grant/Contract Number:
AC52-07NA27344; AC02-06CH11357; LLNL-JRNL-703660
OSTI ID:
1781294
Alternate ID(s):
OSTI ID: 1372694; OSTI ID: 1397848
Report Number(s):
LLNL-JRNL-703660; 836747
Journal Information:
Acta Materialia, Vol. 128; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 84 works
Citation information provided by
Web of Science

References (38)

Fiducial marker application method for position alignment of in situ multimodal X-ray experiments and reconstructions journal March 2016
Synchrotron applications of an amorphous silicon flat-panel detector journal July 2008
A rotational and axial motion system load frame insert for in situ high energy x-ray studies journal September 2015
Integrated computational materials engineering: A new paradigm for the global materials profession journal November 2006
A fast methodology to determine the characteristics of thousands of grains using three-dimensional X-ray diffraction. II. Volume, centre-of-mass position, crystallographic orientation and strain state of grains journal July 2012
Single-Crystal Elastic Moduli and the hcp → bcc Transformation in Ti, Zr, and Hf journal July 1964
The identification of a Non-Basal slip vector in titanium and Titanium-Aluminum alloys journal January 1968
High-energy diffraction microscopy at the advanced photon source journal July 2011
Modeling void growth in polycrystalline materials journal October 2013
Understanding local deformation in metallic polycrystals using high energy X-rays and finite elements journal October 2014
Quantitative analysis of crystal scale deformation heterogeneity during cyclic plasticity using high-energy X-ray diffraction and finite-element simulation journal August 2014
Crystal Plasticity journal December 1983
Efficient subpixel image registration algorithms journal January 2008
Study of Structure and Deformation Pathways in Ti-7Al Using Atomistic Simulations, Experiments, and Characterization journal March 2017
Latent hardening in copper and aluminium single crystals journal March 1980
Study of grain-level deformation and residual stresses in Ti-7Al under combined bending and tension using high energy diffraction microscopy (HEDM) journal September 2016
Relation of dislocation density in different slip systems to work hardening parameters for magnesium crystals journal April 1975
Far-field high-energy diffraction microscopy: a tool for intergranular orientation and strain analysis journal July 2011
In situ single-grain peak profile measurements on Ti–7Al during tensile deformation journal October 2009
Determining grain resolved stresses in polycrystalline materials using three-dimensional X-ray diffraction journal April 2010
Overview of constitutive laws, kinematics, homogenization and multiscale methods in crystal plasticity finite-element modeling: Theory, experiments, applications journal February 2010
Characterization of microstructural anisotropy in orthotropic materials using a second rank tensor journal March 1984
Deformation behavior of HCP Ti-Al alloy single crystals journal March 2002
Effect of texture and slip mode on the anisotropy of plastic flow and flow softening during hot working of Ti-6Al-4V journal July 2001
Key computational modeling issues in Integrated Computational Materials Engineering journal January 2013
Short-range order (SRO) and its effect on the primary creep behavior of a Ti–6wt.%Al alloy journal December 2001
Crystal Plasticity Model Validation Using Combined High-Energy Diffraction Microscopy Data for a Ti-7Al Specimen journal November 2016
Mechanical twinning and detwinning in pure Ti during loading and unloading – An in situ high-energy X-ray diffraction microscopy study journal December 2014
Ductile Fracture by Void Growth to Coalescence book January 2010
Kinetics of flow and strain-hardening journal November 1981
New opportunities for quantitative tracking of polycrystal responses in three dimensions journal August 2015
Defect evolution and pore collapse in crystalline energetic materials journal February 2009
On modelling the elasto-viscoplastic response of metals using polycrystal plasticity journal November 1998
The effect of aluminium on twinning in binary alpha-titanium journal January 2016
Static recovery in titanium alloys at lower temperatures journal December 2004
Plastic behavior of titanium-aluminum alloys journal February 1974
A polycrystal plasticity model of strain localization in irradiated iron journal February 2013
Fatigue crack growth rates in alpha titanium: Faceted vs. striation growth journal March 2013

Cited By (11)

Optimization of VPSC Model Parameters for Two-Phase Titanium Alloys: Flow Stress Vs Orientation Distribution Function Metrics journal June 2018
Uncertainty Quantification in the Mechanical Response of Crystal Plasticity Simulations journal June 2019
Parametrically Homogenized Constitutive Models (PHCMs) for Multi-scale Predictions of Fatigue Crack Nucleation in Titanium Alloys journal June 2019
In-Situ Grain Resolved Stress Characterization During Damage Initiation in Cu-10%W Alloy journal July 2019
Automated Grain Yield Behavior Classification journal September 2019
Crystal Plasticity Model Calibration for Ti-7Al Alloy with a Multi-fidelity Computational Scheme journal November 2018
Intermittent plasticity in individual grains: A study using high energy x-ray diffraction journal January 2019
Measuring stress-induced martensite microstructures using far-field high-energy diffraction microscopy journal August 2018
Intragranular three-dimensional stress tensor fields in plastically deformed polycrystals journal December 2019
Investigation of strain redistribution mechanism in α titanium by image-based crystal plasticity analysis journal September 2019
Combined Effects of Texture and Grain Size Distribution on the Tensile Behavior of α-Titanium journal June 2018

Similar Records

Shock compression/release of magnesium single crystals along a low-symmetry orientation: Role of basal slip
Journal Article · Mon Sep 16 00:00:00 EDT 2019 · Journal of Applied Physics · OSTI ID:1781294

Deformation behavior of CP-titanium under strain path changes: Experiment and crystal plasticity modeling
Journal Article · Sun Oct 10 00:00:00 EDT 2021 · International Journal of Plasticity · OSTI ID:1781294

Strength, deformation, and equation of state of tungsten carbide to 66 GPa
Journal Article · Thu Sep 09 00:00:00 EDT 2021 · Acta Materialia · OSTI ID:1781294