Twinning-detwinning behavior during cyclic deformation of magnesium alloy

Lee, Soo Yeol; Wang, Huamiao; Gharghouri, Michael A.

doi:10.3390/met5020881

Title: Twinning-detwinning behavior during cyclic deformation of magnesium alloy

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Abstract

In situ neutron diffraction has been used to examine the deformation mechanisms of a precipitation-hardened and extruded Mg-8.5wt.%Al alloy subjected to (i) compression followed by reverse tension (texture T1) and (ii) tension followed by reverse compression (texture T2). Two starting textures are used: (1) as-extruded texture, T1, in which the basal pole of most grains is normal to the extrusion axis and a small portion of grains are oriented with the basal pole parallel to the extrusion axis; (2) a reoriented texture, T2, in which the basal pole of most grains is parallel to the extrusion axis. For texture T1, the onset of extension twinning corresponds well with the macroscopic elastic-plastic transition during the initial compression stage. The non-linear macroscopic stress/strain behavior during unloading after compression is more significant than during unloading after tension. For texture T2, little detwinning occurs after the initial tension stage, but almost all of the twinned volumes are detwinned during loading in reverse compression.

Authors:

Lee, Soo Yeol ^[1]; Wang, Huamiao ^[2]; Gharghouri, Michael A. ^[3]

Chungnam National Univ., Daejeon (Korea)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Canadian Nuclear Lab., Chalk River, ON (Canada)

Publication Date:: 2015-05-26

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

Sponsoring Org.:: USDOE

OSTI Identifier:: 1208853

Grant/Contract Number:: AC52-06NA25396

Resource Type:: Accepted Manuscript

Journal Name:: Metals

Additional Journal Information:: Journal Volume: 5; Journal Issue: 2; Journal ID: ISSN 2075-4701

Publisher:: MDPI

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; magnesium alloy; deformation; twinning; detwinning; neutron diffraction

Citation Formats


                    Lee, Soo Yeol, Wang, Huamiao, and Gharghouri, Michael A. Twinning-detwinning behavior during cyclic deformation of magnesium alloy.  United States: N. p., 2015. 
Web.  doi:10.3390/met5020881.

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                    Lee, Soo Yeol, Wang, Huamiao, & Gharghouri, Michael A. Twinning-detwinning behavior during cyclic deformation of magnesium alloy.  United States.  https://doi.org/10.3390/met5020881

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                    Lee, Soo Yeol, Wang, Huamiao, and Gharghouri, Michael A. Tue .  
"Twinning-detwinning behavior during cyclic deformation of magnesium alloy".  United States.  https://doi.org/10.3390/met5020881.  https://www.osti.gov/servlets/purl/1208853.

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@article{osti_1208853,

  title        = {Twinning-detwinning behavior during cyclic deformation of magnesium alloy},

  author       = {Lee, Soo Yeol and Wang, Huamiao and Gharghouri, Michael A.},

  abstractNote = {In situ neutron diffraction has been used to examine the deformation mechanisms of a precipitation-hardened and extruded Mg-8.5wt.%Al alloy subjected to (i) compression followed by reverse tension (texture T1) and (ii) tension followed by reverse compression (texture T2). Two starting textures are used: (1) as-extruded texture, T1, in which the basal pole of most grains is normal to the extrusion axis and a small portion of grains are oriented with the basal pole parallel to the extrusion axis; (2) a reoriented texture, T2, in which the basal pole of most grains is parallel to the extrusion axis. For texture T1, the onset of extension twinning corresponds well with the macroscopic elastic-plastic transition during the initial compression stage. The non-linear macroscopic stress/strain behavior during unloading after compression is more significant than during unloading after tension. For texture T2, little detwinning occurs after the initial tension stage, but almost all of the twinned volumes are detwinned during loading in reverse compression.},

  doi          = {10.3390/met5020881},

  journal      = {Metals},

  number       = 2,

  volume       = 5,

  place        = {United States},

  year         = {2015},

  month        = {5}

}

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