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

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 » of light-weight wrought Mg alloys as structural materials.« less

Authors:
 [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
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. https://doi.org/10.1016/j.jallcom.2015.09.247.
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
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.
@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 = {2015},
month = {10}
}

Journal Article:

Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

Save / Share:

Works referenced in this record:

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

  • Chen, Lijia; Wang, Chunyan; Wu, Wei
  • Metallurgical and Materials Transactions A, Vol. 38, Issue 13
  • DOI: 10.1007/s11661-007-9181-y

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


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

  • Ishihara, Sotomi; Nan, Zhenyu; Goshima, Takahito
  • Materials Science and Engineering: A, Vol. 468-470
  • DOI: 10.1016/j.msea.2006.09.124

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


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


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


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

  • Muránsky, O.; Barnett, M. R.; Luzin, V.
  • Materials Science and Engineering: A, Vol. 527, Issue 6
  • DOI: 10.1016/j.msea.2009.10.018

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

  • Muránsky, O.; Carr, D. G.; Barnett, M. R.
  • Materials Science and Engineering: A, Vol. 496, Issue 1-2
  • DOI: 10.1016/j.msea.2008.07.031

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

  • Brown, D. W.; Agnew, S. R.; Bourke, M. A. M.
  • Materials Science and Engineering: A, Vol. 399, Issue 1-2
  • DOI: 10.1016/j.msea.2005.02.016

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

  • Proust, Gwénaëlle; Tomé, Carlos N.; Jain, Ashutosh
  • International Journal of Plasticity, Vol. 25, Issue 5
  • DOI: 10.1016/j.ijplas.2008.05.005

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

  • Gharghouri, M. A.; Weatherly, G. C.; Embury, J. D.
  • Philosophical Magazine A, Vol. 79, Issue 7
  • DOI: 10.1080/01418619908210386

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

  • Hong, Seong-Gu; Park, Sung Hyuk; Lee, Chong Soo
  • Journal of Materials Research, Vol. 25, Issue 4
  • DOI: 10.1557/JMR.2010.0094

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

  • An, Ke; Skorpenske, Harley D.; Stoica, Alexandru D.
  • Metallurgical and Materials Transactions A, Vol. 42, Issue 1
  • DOI: 10.1007/s11661-010-0495-9

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


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


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

  • Chen, Yan; Yang, Ling; Ren, Fei
  • Scientific Reports, Vol. 4, Issue 1
  • DOI: 10.1038/srep05179

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


    Works referencing / citing this record:

    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

    • Song, Bo; Shu, Xiaogang; Pan, Hucheng
    • Advanced Engineering Materials, Vol. 19, Issue 11
    • DOI: 10.1002/adem.201700267

    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

    • Granroth, Garrett E.; An, Ke; Smith, Hillary L.
    • Journal of Applied Crystallography, Vol. 51, Issue 3
    • DOI: 10.1107/s1600576718004727