The effects of free surfaces on deformation twinning in HCP metals

Leu, Brandon; Arul Kumar, M.; Beyerlein, I. J.

doi:10.1016/j.mtla.2021.101124

Title: The effects of free surfaces on deformation twinning in HCP metals

Abstract

Deformation twinning is a predominant mode of plastic deformation for hexagonal close packed metals, like Mg and Ti. The heterogenous microstructure and the local stresses associated with twinning play a key role in their mechanical response and fracture. Surface analyses, like electron microscopy, are frequently employed to spatially map microstructure and micromechanical fields in order to study twinning behavior. However, these measurements are inherently influenced by the vicinity of the free surface. In this work, an elasto-visco-plastic fast-Fourier-transform (EVP-FFT) polycrystal modeling approach is employed to investigate the effects of free surfaces on twin development before and after loading. We compare calculated micromechanical fields on free surfaces with those calculated inside the bulk and, in some cases, experimental surface measurements. The results indicate that the creation of free surfaces can promote twin propagation and growth and can influence twin morphology by causing a twin lamella to become larger, more blunted and irregular. The structure along the twin boundaries are also affected, due to the higher driving stresses that extend prismatic-basal and basal-prismatic facets. Furthermore, free surfaces invoke different slip activities in the twin and the surrounding parent crystal by enhancing basal, prismatic and pyramidal slip in some localized regions, while reducingmore »« less

Authors:

^[1];

^[2];

^[1]

Univ. of California, Santa Barbara, CA (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Publication Date:: Thu May 20 00:00:00 EDT 2021

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

Sponsoring Org.:: USDOE Office of Science (SC). Basic Energy Sciences (BES); USDOD; National Science Foundation (NSF)

OSTI Identifier:: 1785481

Report Number(s):: LA-UR-21-20284
Journal ID: ISSN 2589-1529

Grant/Contract Number:: 89233218CNA000001; FWP-06SCPE401; CMMI-1728224

Resource Type:: Accepted Manuscript

Journal Name:: Materialia

Additional Journal Information:: Journal Volume: 17; Journal ID: ISSN 2589-1529

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; free surface; relaxation; deformation twins; local stresses; microscope and HCP metals

Citation Formats


                    Leu, Brandon, Arul Kumar, M., and Beyerlein, I. J. The effects of free surfaces on deformation twinning in HCP metals.  United States: N. p., 2021. 
Web.  doi:10.1016/j.mtla.2021.101124.

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                    Leu, Brandon, Arul Kumar, M., & Beyerlein, I. J. The effects of free surfaces on deformation twinning in HCP metals.  United States.  https://doi.org/10.1016/j.mtla.2021.101124

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                    Leu, Brandon, Arul Kumar, M., and Beyerlein, I. J. Thu .  
"The effects of free surfaces on deformation twinning in HCP metals".  United States.  https://doi.org/10.1016/j.mtla.2021.101124.  https://www.osti.gov/servlets/purl/1785481.

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@article{osti_1785481,

  title        = {The effects of free surfaces on deformation twinning in HCP metals},

  author       = {Leu, Brandon and Arul Kumar, M. and Beyerlein, I. J.},

  abstractNote = {Deformation twinning is a predominant mode of plastic deformation for hexagonal close packed metals, like Mg and Ti. The heterogenous microstructure and the local stresses associated with twinning play a key role in their mechanical response and fracture. Surface analyses, like electron microscopy, are frequently employed to spatially map microstructure and micromechanical fields in order to study twinning behavior. However, these measurements are inherently influenced by the vicinity of the free surface. In this work, an elasto-visco-plastic fast-Fourier-transform (EVP-FFT) polycrystal modeling approach is employed to investigate the effects of free surfaces on twin development before and after loading. We compare calculated micromechanical fields on free surfaces with those calculated inside the bulk and, in some cases, experimental surface measurements. The results indicate that the creation of free surfaces can promote twin propagation and growth and can influence twin morphology by causing a twin lamella to become larger, more blunted and irregular. The structure along the twin boundaries are also affected, due to the higher driving stresses that extend prismatic-basal and basal-prismatic facets. Furthermore, free surfaces invoke different slip activities in the twin and the surrounding parent crystal by enhancing basal, prismatic and pyramidal slip in some localized regions, while reducing slip in others. We demonstrate that the simulated free-surface effects lead to better qualitative and quantitative agreement with experimental measurements from scanning electron microscopy and digital image correlation.},

  doi          = {10.1016/j.mtla.2021.101124},

  journal      = {Materialia},

  number       = ,

  volume       = 17,

  place        = {United States},

  year         = {Thu May 20 00:00:00 EDT 2021},

  month        = {Thu May 20 00:00:00 EDT 2021}

}

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Title: The effects of free surfaces on deformation twinning in HCP metals

Abstract

Citation Formats

Double-slit photoelectron interference in strong-field ionization of the neon dimer journal, January 2019

An analysis of dislocation nucleation near a free surface journal, March 2007

Effect of microstructure on the nucleation of deformation twins in polycrystalline high-purity magnesium: A multi-scale modeling study journal, May 2011

Numerical study of the stress state of a deformation twin in magnesium journal, February 2015

Spatially resolved in situ strain measurements from an interior twinned grain in bulk polycrystalline AZ31 alloy journal, June 2013

The Peierls stress for coupled dislocation partials near a free surface journal, April 2012

Interface structures and twinning mechanisms of twins in hexagonal metals journal, June 2017

Local Stress States and Microstructural Damage Response Associated with Deformation Twins in Hexagonal Close Packed Metals journal, December 2017

Capturing the effects of free surfaces on void strengthening with dislocation dynamics journal, December 2015

Nanoscale gold pillars strengthened through dislocation starvation journal, June 2006

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Mechanical annealing and source-limited deformation in submicrometre-diameter Ni crystals journal, December 2007

Surface effect on the screw dislocation mobility over the Peierls barrier journal, June 2012

Size dependence of mechanical properties of gold at the micron scale in the absence of strain gradients journal, April 2005

On the use of transmission electron microscopy to quantify dislocation densities in bulk metals journal, March 2020

Yield point elongation due to twinning in a magnesium alloy journal, February 2012

Effect of local stress fields on twin characteristics in HCP metals journal, September 2016

Deformation of Thin Copper Crystals journal, April 1956

A study of twinning in zirconium using neutron diffraction and polycrystalline modeling journal, March 2002

Discrete dislocation simulations of the plasticity of micro-pillars under uniaxial loading journal, April 2008

Formation and stability of long basal-prismatic facets in Mg journal, February 2020

Comment on “Lattice Resistance to Dislocation Motion at the Nanoscale” journal, August 2010

Perspective on hetero-deformation induced (HDI) hardening and back stress journal, May 2019

Internal strain and texture development during twinning: Comparing neutron diffraction measurements with crystal plasticity finite-element approaches journal, March 2012

Twin formation from a twin boundary in Mg during in-situ nanomechanical testing journal, June 2019

Grain neighbour effects on twin transmission in hexagonal close-packed materials journal, December 2016

Evolution of stress in individual grains and twins in a magnesium alloy aggregate journal, July 2009

The flow stress gradient between the surface and centre of deformed copper single crystals journal, April 1968

Study of internal lattice strain distributions in stainless steel using a full-field elasto-viscoplastic formulation based on fast Fourier transforms journal, April 2012

Deformation behavior of CP-titanium: Experiment and crystal plasticity modeling journal, May 2018

A half-space Peierls–Nabarro model and the mobility of screw dislocations in a thin film journal, April 2007

Why are { 10 1 ¯ 2 } twins profuse in magnesium? journal, February 2015

Some consequences of surface and size effects in plastically deformed copper single crystals journal, March 1971

Modeling discrete twin lamellae in a microstructural framework journal, August 2016

N-site modeling of a 3D viscoplastic polycrystal using Fast Fourier Transform journal, August 2001

Interfacial structure of { 1 0 1 ‾ 2 } twin tip in deformed magnesium alloy journal, November 2014

Dislocation escape-related size effects in single-crystal micropillars under uniaxial compression journal, March 2007

Double-slit photoelectron interference in strong-field ionization of the neon dimer
journal, January 2019

An analysis of dislocation nucleation near a free surface
journal, March 2007

Effect of microstructure on the nucleation of deformation twins in polycrystalline high-purity magnesium: A multi-scale modeling study
journal, May 2011

Numerical study of the stress state of a deformation twin in magnesium
journal, February 2015

Spatially resolved in situ strain measurements from an interior twinned grain in bulk polycrystalline AZ31 alloy
journal, June 2013

The Peierls stress for coupled dislocation partials near a free surface
journal, April 2012

Interface structures and twinning mechanisms of twins in hexagonal metals
journal, June 2017

Local Stress States and Microstructural Damage Response Associated with Deformation Twins in Hexagonal Close Packed Metals
journal, December 2017

Capturing the effects of free surfaces on void strengthening with dislocation dynamics
journal, December 2015

Nanoscale gold pillars strengthened through dislocation starvation
journal, June 2006

Neutron and Synchrotron X-ray Strain Scanning
journal, February 2001

Twin hopping in nanolayered Zr-2.5Nb
journal, April 2020

Reorientation and stress relaxation due to twinning: Modeling and experimental characterization for Mg
journal, June 2008

Characterization of basal-prismatic interface of twin in deformed titanium by high-resolution transmission electron microscopy
journal, March 2015

Dislocation drag at the nanoscale
journal, November 2010

In situ neutron diffraction investigation of deformation twinning and pseudoelastic-like behaviour of extruded AZ31 magnesium alloy
journal, June 2009

Free-Surface Effects in 3D Dislocation Dynamics: Formulation and Modeling
journal, June 2002

Investigation of {10 1 2} twins in Zn using high-resolution electron microscopy: Interfacial defects and interactions
journal, April 1997

Atomistic simulations of interaction between basal <a> dislocations and three-dimensional twins in magnesium
journal, August 2018

Surface effects on stacking fault and twin formation in fcc nanofilms: A first-principles study
journal, December 2011

Finite element analysis of the free surface effects on the mechanical behavior of thin nickel polycrystals
journal, February 2012

Mechanical annealing and source-limited deformation in submicrometre-diameter Ni crystals
journal, December 2007

Surface effect on the screw dislocation mobility over the Peierls barrier
journal, June 2012

Size dependence of mechanical properties of gold at the micron scale in the absence of strain gradients
journal, April 2005

On the use of transmission electron microscopy to quantify dislocation densities in bulk metals
journal, March 2020

Yield point elongation due to twinning in a magnesium alloy
journal, February 2012

Effect of local stress fields on twin characteristics in HCP metals
journal, September 2016

Deformation of Thin Copper Crystals
journal, April 1956

A study of twinning in zirconium using neutron diffraction and polycrystalline modeling
journal, March 2002

Discrete dislocation simulations of the plasticity of micro-pillars under uniaxial loading
journal, April 2008

Formation and stability of long basal-prismatic facets in Mg
journal, February 2020

Comment on “Lattice Resistance to Dislocation Motion at the Nanoscale”
journal, August 2010

Perspective on hetero-deformation induced (HDI) hardening and back stress
journal, May 2019

Internal strain and texture development during twinning: Comparing neutron diffraction measurements with crystal plasticity finite-element approaches
journal, March 2012

Twin formation from a twin boundary in Mg during in-situ nanomechanical testing
journal, June 2019

Grain neighbour effects on twin transmission in hexagonal close-packed materials
journal, December 2016

Evolution of stress in individual grains and twins in a magnesium alloy aggregate
journal, July 2009

The flow stress gradient between the surface and centre of deformed copper single crystals
journal, April 1968

Study of internal lattice strain distributions in stainless steel using a full-field elasto-viscoplastic formulation based on fast Fourier transforms
journal, April 2012

Deformation behavior of CP-titanium: Experiment and crystal plasticity modeling
journal, May 2018

A half-space Peierls–Nabarro model and the mobility of screw dislocations in a thin film
journal, April 2007

Why are ${10 \bar{1} 2}$ twins profuse in magnesium?
journal, February 2015

Some consequences of surface and size effects in plastically deformed copper single crystals
journal, March 1971

Modeling discrete twin lamellae in a microstructural framework
journal, August 2016

N-site modeling of a 3D viscoplastic polycrystal using Fast Fourier Transform
journal, August 2001

Interfacial structure of { $1 0 \overline{1} 2$ } twin tip in deformed magnesium alloy
journal, November 2014

Dislocation escape-related size effects in single-crystal micropillars under uniaxial compression
journal, March 2007