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Title: In-situ white beam microdiffraction study of the deformation behavior in polycrystalline magnesium alloy during uniaxial loading

Abstract

Scanning white beam X-ray microdiffraction has been used to study the heterogeneous grain deformation in a polycrystalline Mg alloy (MgAZ31). The high spatial resolution achieved on beamline 7.3.3 at the Advanced Light Source provides a unique method to measure the elastic strain and orientation of single grains as a function of applied load. To carry out in-situmeasurements a light weight (~;;0.5kg) tensile stage, capable of providing uniaxial loads of up to 600kg, was designed to collect diffraction data on the loading and unloading cycle. In-situ observation of the deformation process provides insight about the crystallographic deformation mode via twinning and dislocation slip.

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
Advanced Light Source Division
OSTI Identifier:
935406
Report Number(s):
LBNL-740E
TRN: US0804290
DOE Contract Number:
DE-AC02-05CH11231
Resource Type:
Conference
Resource Relation:
Conference: 9th International Conference of the American Institute of Physics; Related Information: Journal Publication Date: 01/19/2007
Country of Publication:
United States
Language:
English
Subject:
36; ADVANCED LIGHT SOURCE; ALLOYS; DEFORMATION; DIFFRACTION; DISLOCATIONS; MAGNESIUM ALLOYS; ORIENTATION; PHYSICS; SLIP; SPATIAL RESOLUTION; STRAINS; TWINNING; UNLOADING; microdiffraction magnesium deformation

Citation Formats

Advanced Light Source, Tamura, Nobumichi, Lynch, P.A., Stevenson, A.W., Liang, D., Parry, D., Wilkins, S., Madsen, I.C., Bettles, C., Tamura, N., and Geandier, G. In-situ white beam microdiffraction study of the deformation behavior in polycrystalline magnesium alloy during uniaxial loading. United States: N. p., 2007. Web.
Advanced Light Source, Tamura, Nobumichi, Lynch, P.A., Stevenson, A.W., Liang, D., Parry, D., Wilkins, S., Madsen, I.C., Bettles, C., Tamura, N., & Geandier, G. In-situ white beam microdiffraction study of the deformation behavior in polycrystalline magnesium alloy during uniaxial loading. United States.
Advanced Light Source, Tamura, Nobumichi, Lynch, P.A., Stevenson, A.W., Liang, D., Parry, D., Wilkins, S., Madsen, I.C., Bettles, C., Tamura, N., and Geandier, G. Fri . "In-situ white beam microdiffraction study of the deformation behavior in polycrystalline magnesium alloy during uniaxial loading". United States. doi:. https://www.osti.gov/servlets/purl/935406.
@article{osti_935406,
title = {In-situ white beam microdiffraction study of the deformation behavior in polycrystalline magnesium alloy during uniaxial loading},
author = {Advanced Light Source and Tamura, Nobumichi and Lynch, P.A. and Stevenson, A.W. and Liang, D. and Parry, D. and Wilkins, S. and Madsen, I.C. and Bettles, C. and Tamura, N. and Geandier, G.},
abstractNote = {Scanning white beam X-ray microdiffraction has been used to study the heterogeneous grain deformation in a polycrystalline Mg alloy (MgAZ31). The high spatial resolution achieved on beamline 7.3.3 at the Advanced Light Source provides a unique method to measure the elastic strain and orientation of single grains as a function of applied load. To carry out in-situmeasurements a light weight (~;;0.5kg) tensile stage, capable of providing uniaxial loads of up to 600kg, was designed to collect diffraction data on the loading and unloading cycle. In-situ observation of the deformation process provides insight about the crystallographic deformation mode via twinning and dislocation slip.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 19 00:00:00 EST 2007},
month = {Fri Jan 19 00:00:00 EST 2007}
}

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  • Scanning white beam X-ray microdiffraction has been used to study the heterogeneous grain deformation in a polycrystalline Mg alloy (MgAZ31). The high spatial resolution achieved on beamline 7.3.3 at the Advanced Light Source provides a unique method to measure the elastic strain and orientation of single grains as a function of applied load. To carry out in-situ measurements a light weight ({approx}0.5kg) tensile stage, capable of providing uniaxial loads of up to 600kg, was designed to collect diffraction data on the loading and unloading cycle. In-situ observation of the deformation process provides insight about the crystallographic deformation mode via twinningmore » and dislocation slip.« less
  • The deformation behavior of pure copper polycrystals was investigated by in situ X-ray microdiffraction using synchrotron radiation. Tensile axis rotations of several positions of same grain were observed. Tensile axis movement depends on local position of a grain. This phenomenon may originate from the orientation relation between neighboring grains.
  • Recent experiments have shown that formation of dislocation cell structures and rotation of structural elements at the macroscopic level are fundamental to the development of plastic deformation. However, attention should also be focused on micro-volumes because local stress and strain can significantly differ from their averaged values at the macroscale. In-situ orientation measurements in copper polycrystals during uniaxial deformation were performed using synchrotron x-ray microdiffraction at the Advanced Light Source. We observed heterogeneities in deformation-induced microstructure within individual grains. Different slip systems in particular can be simultaneously activated among neighboring volume elements of individual grains.
  • Recent experiments have shown that formation of dislocation cell structures and rotation of structural elements at the macroscopic level are fundamental to the development of plastic deformation. However, attention should also be focused on micro-volumes because local stress and strain can significantly differ from their averaged values at the macroscale. In-situ orientation measurements in copper polycrystals during uniaxial deformation were performed using synchrotron x-ray microdiffraction at the Advanced Light Source. We observed heterogeneities in deformation-induced microstructure within individual grains. Different slip systems in particular can be simultaneously activated among neighboring volume elements of individual grains.
  • In situ synchrotron x-ray imaging and diffraction are used to investigate anisotropic deformation of an extruded magnesium alloy AZ31 under uniaxial compression along two different directions, with the loading axis (LA) either parallel or perpendicular to the extrusion direction (ED), referred to as LA∥ED and LAED, respectively. Multiscale measurements including stress–strain curves (macroscale), x-ray digital image correlation (mesoscale), and diffraction (microscale) are obtained simultaneously. Electron backscatter diffraction is performed on samples collected at various strains to characterize deformation twins. The rapid increase in strain hardening rate for the LA∥ED loading is attributed to marked {101¯2} extension twinning and subsequent homogenizationmore » of deformation, while dislocation motion leads to inhomogeneous deformation and a decrease in strain hardening rate.« less