Understanding Low-cycle Fatigue Life Improvement Mechanisms in a Pre-twinned Magnesium Alloy

Wu, Wei; An, Ke

doi:10.1016/j.jallcom.2015.09.247

Title: Understanding Low-cycle Fatigue Life Improvement Mechanisms in a Pre-twinned Magnesium Alloy

Abstract

The mechanisms of fatigue life improvement by pre-twinning process in a commercial rolled magnesium (Mg) alloy have been investigated using real-time in situ neutron diffraction under a continuous-loading condition. It is found that by introducing the excess twinned grains through pre-compression along the rolling direction the fatigue life was enhanced approximately 50%, mainly resulting from the prolonged detwinning process and inhibited dislocation slip during reverse tension. Moreover, after pre-twinning process, the removal of the rapid strain hardening during reverse tension leads to a compressive mean stress value and more symmetric shape of stress-strain hysteresis loop. The pre-twinning has significant impacts on the twinning-detwinning characteristics and deformation modes during cyclic loading and greatly facilitates the twinning-detwinning activities in plastic deformation. The cyclic straining leads to the increase of contribution of tensile twinning deformation in overall plastic deformation in both the as-received and pre-deformed sample. The mechanisms of load partitioning in different groups of grains are closely related to the deformation modes in each deformation stage, while the fatigue cycling has little influence on the load sharing. The pre-twinning process provides an easy and cost-effective route to improve the low-cycle fatigue life through manufacturing and processing, which would advance the wide applicationmore »« less

Authors:

Wu, Wei ^[1]; An, Ke ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Publication Date:: Sat Oct 03 00:00:00 EDT 2015

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1236579

Alternate Identifier(s):: OSTI ID: 1397507

Grant/Contract Number:: AC05-00OR22725; LDRD-6789

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Alloys and Compounds

Additional Journal Information:: Journal Volume: 656; Journal ID: ISSN 0925-8388

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; Magnesium alloy; Cyclic loading; Deformation mechanisms; Neutron diffraction; Twinning

Citation Formats


                    Wu, Wei, and An, Ke. Understanding Low-cycle Fatigue Life Improvement Mechanisms in a Pre-twinned Magnesium Alloy.  United States: N. p., 2015. 
Web.  doi:10.1016/j.jallcom.2015.09.247.

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                    Wu, Wei, & An, Ke. Understanding Low-cycle Fatigue Life Improvement Mechanisms in a Pre-twinned Magnesium Alloy.  United States.  https://doi.org/10.1016/j.jallcom.2015.09.247

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                    Wu, Wei, and An, Ke. Sat .  
"Understanding Low-cycle Fatigue Life Improvement Mechanisms in a Pre-twinned Magnesium Alloy".  United States.  https://doi.org/10.1016/j.jallcom.2015.09.247.  https://www.osti.gov/servlets/purl/1236579.

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@article{osti_1236579,

  title        = {Understanding Low-cycle Fatigue Life Improvement Mechanisms in a Pre-twinned Magnesium Alloy},

  author       = {Wu, Wei and An, Ke},

  abstractNote = {The mechanisms of fatigue life improvement by pre-twinning process in a commercial rolled magnesium (Mg) alloy have been investigated using real-time in situ neutron diffraction under a continuous-loading condition. It is found that by introducing the excess twinned grains through pre-compression along the rolling direction the fatigue life was enhanced approximately 50%, mainly resulting from the prolonged detwinning process and inhibited dislocation slip during reverse tension. Moreover, after pre-twinning process, the removal of the rapid strain hardening during reverse tension leads to a compressive mean stress value and more symmetric shape of stress-strain hysteresis loop. The pre-twinning has significant impacts on the twinning-detwinning characteristics and deformation modes during cyclic loading and greatly facilitates the twinning-detwinning activities in plastic deformation. The cyclic straining leads to the increase of contribution of tensile twinning deformation in overall plastic deformation in both the as-received and pre-deformed sample. The mechanisms of load partitioning in different groups of grains are closely related to the deformation modes in each deformation stage, while the fatigue cycling has little influence on the load sharing. The pre-twinning process provides an easy and cost-effective route to improve the low-cycle fatigue life through manufacturing and processing, which would advance the wide application of light-weight wrought Mg alloys as structural materials.},

  doi          = {10.1016/j.jallcom.2015.09.247},

  journal      = {Journal of Alloys and Compounds},

  number       = ,

  volume       = 656,

  place        = {United States},

  year         = {Sat Oct 03 00:00:00 EDT 2015},

  month        = {Sat Oct 03 00:00:00 EDT 2015}

}

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https://doi.org/10.1016/j.jallcom.2015.09.247

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Tracing Phase Transformation and Lattice Evolution in a TRIP Sheet Steel under High-Temperature Annealing by Real-Time In Situ Neutron Diffraction
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Xu, Huiru; Li, Qizhen
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Title: Understanding Low-cycle Fatigue Life Improvement Mechanisms in a Pre-twinned Magnesium Alloy

Abstract

Citation Formats

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Microstructure and deformation mechanism of Mg6Al1ZnA alloy experienced tension–compression cyclic loading journal, February 2011

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Dependence of compressive deformation on pre-strain and loading direction in an extruded magnesium alloy: Texture, twinning and de-twinning journal, February 2014

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Internal stress relaxation and load redistribution during the twinning–detwinning-dominated cyclic deformation of a wrought magnesium alloy, ZK60A journal, August 2008

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Deformation dynamics study of a wrought magnesium alloy by real-time in situ neutron diffraction journal, September 2013

Unraveling cyclic deformation mechanisms of a rolled magnesium alloy using in situ neutron diffraction journal, February 2015

Investigation of deformation twinning in a fine-grained and coarse-grained ZM20 Mg alloy: Combined in situ neutron diffraction and acoustic emission journal, March 2010

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Twinning and de-twinning in beryllium during strain path changes journal, January 2013

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First Results from the VULCAN Diffractometer at the SNS journal, May 2010

VULCAN—The engineering diffractometer at the SNS journal, November 2006

Revealing the cyclic hardening mechanism of an austenitic stainless steel by real-time in situ neutron diffraction journal, October 2014

Visualizing the Structural Evolution of LSM/xYSZ Composite Cathodes for SOFC by in-situ Neutron Diffraction journal, June 2014

Temperature-dependent behavior of a polycrystalline NiTi shape memory alloy around the transformation regime journal, April 2013

Bending Behavior of a Wrought Magnesium Alloy Investigated by the In Situ Pinhole Neutron Diffraction Method journal, August 2018

Influence of Torsion Route on the Microstructure and Mechanical Properties of Extruded AZ31 Rods journal, June 2017

Tracing Phase Transformation and Lattice Evolution in a TRIP Sheet Steel under High-Temperature Annealing by Real-Time In Situ Neutron Diffraction journal, September 2018

Deformation mechanisms and mechanical properties of porous magnesium/carbon nanofiber composites with different porosities journal, July 2018

Event-based processing of neutron scattering data at the Spallation Neutron Source journal, May 2018

Magnesium alloys and applications
journal, January 1994

Improvement of formability and mechanical properties of magnesium alloys via pre-twinning: A review
journal, October 2014

Current issues in magnesium sheet alloys: Where do we go from here?
journal, August 2014

Low-Cycle Fatigue Behavior of an As-Extruded AM50 Magnesium Alloy
journal, May 2007

Twinning effects in a polycrystalline magnesium alloy under cyclic deformation
journal, January 2014

Investigation of fatigue anisotropy in an extruded magnesium alloy
journal, June 2013

Low cycle fatigue of a rare-earth containing extruded magnesium alloy
journal, July 2013

Low cycle fatigue of an extruded Mg–3Nd–0.2Zn–0.5Zr magnesium alloy
journal, December 2014

Low-cycle Fatigue Behaviors of an As-extruded Mg–12%Gd–3%Y–0.5%Zr Alloy
journal, August 2013

In situ neutron diffraction and polycrystal plasticity modeling of a Mg–Y–Nd–Zr alloy: Effects of precipitation on individual deformation mechanisms
journal, June 2013

Cyclic deformation and fatigue of extruded ZK60 magnesium alloy with aging effects
journal, October 2014

Effect of aging treatment on low-cycle fatigue behavior of extruded Mg–8Al–0.5Zn alloys
journal, October 2012

Effect of microstructure on fatigue behavior of AZ31 magnesium alloy
journal, November 2007

Microstructure and deformation mechanism of Mg6Al1ZnA alloy experienced tension–compression cyclic loading
journal, February 2011

Precipitate characteristics and their effect on the prismatic-slip-dominated deformation behaviour of an Mg–6 Zn alloy
journal, June 2013

Effect of plate-shaped particle distributions on the deformation behaviour of magnesium alloy AZ91 in tension and compression
journal, January 2012

Sensitivity of deformation twinning to grain size in titanium and magnesium
journal, December 2011

Influence of grain size on the compressive deformation of wrought Mg–3Al–1Zn
journal, October 2004

Microstructure-sensitive investigation of magnesium alloy fatigue
journal, May 2015

The effects of texture and extension twinning on the low-cycle fatigue behavior of a rolled magnesium alloy, AZ31B
journal, October 2010

Dependence of compressive deformation on pre-strain and loading direction in an extruded magnesium alloy: Texture, twinning and de-twinning
journal, February 2014

Twinning–detwinning behavior during the strain-controlled low-cycle fatigue testing of a wrought magnesium alloy, ZK60A
journal, February 2008

Internal stress relaxation and load redistribution during the twinning–detwinning-dominated cyclic deformation of a wrought magnesium alloy, ZK60A
journal, August 2008

Twinning–detwinning behavior during fatigue-crack propagation in a wrought magnesium alloy AZ31B
journal, October 2012

Deformation dynamics study of a wrought magnesium alloy by real-time in situ neutron diffraction
journal, September 2013

Unraveling cyclic deformation mechanisms of a rolled magnesium alloy using in situ neutron diffraction
journal, February 2015

Investigation of deformation twinning in a fine-grained and coarse-grained ZM20 Mg alloy: Combined in situ neutron diffraction and acoustic emission
journal, March 2010

Plastic anisotropy and the role of non-basal slip in magnesium alloy AZ31B
journal, June 2005

Hardening evolution of AZ31B Mg sheet
journal, January 2007

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

Pseudoelastic behavior of magnesium alloy during twinning-dominated cyclic deformation
journal, June 2013

Twinning and de-twinning in beryllium during strain path changes
journal, January 2013

On the correlation between deformation twinning and Lüders-like deformation in an extruded Mg alloy: In situ neutron diffraction and EPSC.4 modelling
journal, March 2010

Investigation of deformation mechanisms involved in the plasticity of AZ31 Mg alloy: In situ neutron diffraction and EPSC modelling
journal, November 2008

Internal strain and texture evolution during deformation twinning in magnesium
journal, June 2005

Modeling the effect of twinning and detwinning during strain-path changes of magnesium alloy AZ31
journal, May 2009

Modeling inelastic behavior of magnesium alloys during cyclic loading–unloading
journal, August 2013

Investigation of deformation dynamics in a wrought magnesium alloy
journal, November 2014

An experimental study of cyclic deformation of extruded AZ61A magnesium alloy
journal, May 2011

Study of slip mechanisms in a magnesium alloy by neutron diffraction and modeling
journal, April 2003

Study of the mechanical properties of Mg-7.7at.% Al by in-situ neutron diffraction
journal, July 1999

Twinning and the ductility of magnesium alloys
journal, August 2007

On the Swift effect and twinning in a rolled magnesium alloy under free-end torsion
journal, August 2013

Role of initial {10−12} twin in the fatigue behavior of rolled Mg–3Al–1Zn alloy
journal, May 2010

Enhancing the fatigue property of rolled AZ31 magnesium alloy by controlling {10-12} twinning-detwinning characteristics
journal, April 2010

Improving low-cycle fatigue properties of rolled AZ31 magnesium alloy by pre-compression deformation
journal, June 2014

First In Situ Lattice Strains Measurements Under Load at VULCAN
journal, October 2010

First Results from the VULCAN Diffractometer at the SNS
journal, May 2010

VULCAN—The engineering diffractometer at the SNS
journal, November 2006

Revealing the cyclic hardening mechanism of an austenitic stainless steel by real-time in situ neutron diffraction
journal, October 2014

Visualizing the Structural Evolution of LSM/xYSZ Composite Cathodes for SOFC by in-situ Neutron Diffraction
journal, June 2014

Temperature-dependent behavior of a polycrystalline NiTi shape memory alloy around the transformation regime
journal, April 2013

Bending Behavior of a Wrought Magnesium Alloy Investigated by the In Situ Pinhole Neutron Diffraction Method
journal, August 2018

Influence of Torsion Route on the Microstructure and Mechanical Properties of Extruded AZ31 Rods
journal, June 2017

Tracing Phase Transformation and Lattice Evolution in a TRIP Sheet Steel under High-Temperature Annealing by Real-Time In Situ Neutron Diffraction
journal, September 2018

Deformation mechanisms and mechanical properties of porous magnesium/carbon nanofiber composites with different porosities
journal, July 2018

Event-based processing of neutron scattering data at the Spallation Neutron Source
journal, May 2018