DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Development of grain-scale slip activity and lattice rotation fields in Inconel 718

Journal Article · · Acta Materialia
 [1];  [2];  [1];  [1];  [3];  [4];  [1];  [1]
  1. University of California, Santa Barbara, CA (United States)
  2. University of Arizona, Tucson, AZ (United States)
  3. University of Poitiers (France)
  4. Cornell University, Ithaca, NY (United States)

Using a combination of in-situ high-resolution digital image correlation (HR-DIC), Heaviside-DIC method (H-DIC), and crystal plasticity finite element (CPFE), we investigate the evolution of intragranular lattice rotations and slip activity during monotonic and cyclic loading in a high performance, polycrystalline face centered cubic material. The CPFE employs a quasi-3D model microstructure, which is a highly resolved mirror representation of the experimental in-situ test sample. In agreement, the measurements and calculations reveal that most grains, regardless of their size and lattice orientation, develop intragranular lattice rotation gradients that span the grain. For a small cluster of grains on the deformed material, we perform HR-DIC analysis of slip lines to demonstrate agreement in the active slip systems and changes in this local slip activity across the individual grains. The combined analysis reveals that deforming grains are divided into sub-granular regions of uniform lattice rotation and these regions are most often associated with only one or two active slip systems. The gradient lines that divide them correspond to changes in the predominant slip system. The model is used to examine the evolution of intragranular lattice rotation in a single fully reversed tension-compression cycle. The calculations indicate that intragranular gradients intensify during the reverse loading path as nearest neighboring regions appear to shed lattice rotation, increasing the lattice rotation in some regions, while shutting down rotation in neighboring regions. So these findings provide insight into the irreversible changes that develop within deforming grains at the scale of the grain, particularly the heterogeneous development of intragranular lattice rotation in early stages of deformation, which could serve as precursors to localization.

Research Organization:
Univ. of California, Santa Barbara, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0018901
OSTI ID:
1976785
Journal Information:
Acta Materialia, Vol. 226, Issue C; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (44)

Strain localization and damage in dual phase steels investigated by coupled in-situ deformation experiments and crystal plasticity simulations journal December 2014
Characterizing microscale deformation mechanisms and macroscopic tensile properties of a high strength magnesium rare-earth alloy: A combined experimental and crystal plasticity approach journal March 2020
On the assumptions of the generalized plane stress problem and the Filon average journal February 2014
A combined grain scale elastic–plastic criterion for identification of fatigue crack initiation sites in a twin containing polycrystalline nickel-base superalloy journal January 2016
Insight into microstructure-sensitive elastic strain concentrations from integrated computational modeling and digital image correlation journal February 2021
Investigation of three-dimensional aspects of grain-scale plastic surface deformation of an aluminum oligocrystal journal December 2008
High-Resolution Deformation Mapping Across Large Fields of View Using Scanning Electron Microscopy and Digital Image Correlation journal August 2018
Stress and deformation heterogeneity in individual grains within polycrystals subjected to fully reversed cyclic loading journal June 2015
Finite element modeling of crystal plasticity with grains shaped as truncated octahedrons journal October 2006
Revealing the Subsurface Basal 〈a〉 Dislocation Activity in Magnesium Through Lattice Rotation Analysis journal September 2020
Incorporating grain-level residual stresses and validating a crystal plasticity model of a two-phase Ti-6Al-4 V alloy produced via additive manufacturing journal December 2018
Effect of realistic 3D microstructure in crystal plasticity finite element analysis of polycrystalline Ti-5Al-2.5Sn journal June 2015
Coupling between experimental measurements and polycrystal finite element calculations for micromechanical study of metallic materials journal September 2007
Quantitative investigation of micro slip and localization in polycrystalline materials under uniaxial tension journal September 2018
Crystal Plasticity journal December 1983
Crystal plasticity modelling and HR-DIC measurement of slip activation and strain localization in single and oligo-crystal Ni alloys under fatigue journal January 2017
Crystallographic aspects of geometrically-necessary and statistically-stored dislocation density journal March 1999
Latent hardening in copper and aluminium single crystals journal March 1980
Understanding the evolving state of deforming polycrystals using synchrotron x-rays journal December 2019
Crack initiation sensitivity of wrought direct aged alloy 718 in the very high cycle fatigue regime: the role of non-metallic inclusions journal December 2016
Experimental investigation of plastic grain interaction journal October 2002
The influence of microstructure on surface strain distributions in a nickel micro-tension specimen journal November 2012
Observations of lattice curvature near the interface of a deformed aluminium bicrystal journal January 2000
Nickel-Based Superalloys for Advanced Turbine Engines: Chemistry, Microstructure and Properties journal March 2006
Overview of constitutive laws, kinematics, homogenization and multiscale methods in crystal plasticity finite-element modeling: Theory, experiments, applications journal February 2010
Simulation of micromechanical behavior of polycrystals: finite elements versus fast Fourier transforms journal August 2009
An experimental study of the polycrystalline plasticity of austenitic stainless steel journal November 2015
Direct measurements of slip irreversibility in a nickel-based superalloy using high resolution digital image correlation journal March 2020
Microstructural statistics for fatigue crack initiation in polycrystalline nickel-base superalloys journal September 2017
Automated and quantitative analysis of plastic strain localization via multi-modal data recombination journal May 2020
Measurement of elastic and rotation fields during irreversible deformation using Heaviside-digital image correlation journal November 2020
A multiscale model for the elastoviscoplastic behavior of Directionally Solidified alloys: Application to FE structural computations journal March 2014
Crystallographic texture evolution in bulk deformation processing of FCC metals journal January 1992
Grain-scale experimental validation of crystal plasticity finite element simulations of tantalum oligocrystals journal September 2014
Kinetics of flow and strain-hardening journal November 1981
A procedure for identifying the plastic behavior of single crystals from the local response of polycrystals journal October 2003
Some geometrical relations in dislocated crystals journal March 1953
Measurements of plastic localization by heaviside-digital image correlation journal September 2018
On modelling the elasto-viscoplastic response of metals using polycrystal plasticity journal November 1998
A crystal-plasticity FEM study on effects of simplified grain representation and mesh types on mesoscopic plasticity heterogeneities journal September 2012
Multiple slip in bicrystal deformation journal June 1957
Self-Assembled Nanoparticle Surface Patterning for Improved Digital Image Correlation in a Scanning Electron Microscope journal March 2013
Material rate dependence and localized deformation in crystalline solids journal December 1983
Three-dimensional investigation of the texture and microstructure below a nanoindent in a Cu single crystal using 3D EBSD and crystal plasticity finite element simulations journal April 2006

Figures / Tables (22)