First Results from the VULCAN Diffractometer at the SNS

Wang, Xun-Li; Holden, T. M.; Stoica, A. D.; An, Ke; Skorpenske, Harley D.; Jones, A.B.; Rennich, George Q; Iverson, Erik B.

doi:10.4028/www.scientific.net/msf.652.105

Cited by 38 publications

(21 citation statements)

References 5 publications

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“…The in situ neutron diffraction measurements were performed at the VULCAN Engineering Materials Diffractometer [56][57][58], the Spallation Neutron Source (SNS), Oak Ridge National Laboratory (ORNL) during fully reversed low-cycle fatigue under a continuous-loading condition. Due to the high neutron flux at the VULCAN instrument at SNS, the real-time in situ neutron diffraction measurements have been successfully employed in a number of studies [20,54,[59][60][61][62].…”

Section: Real-time In Situ Neutron Diffraction Measurementsmentioning

confidence: 99%

Unraveling cyclic deformation mechanisms of a rolled magnesium alloy using in situ neutron diffraction

Liaw

2015

Acta Materialia

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In the current study, the deformation mechanisms of a rolled magnesium alloy were investigated under cyclic loading using real-time in situ neutron diffraction under a continuous-loading condition. The relationship between the macroscopic cyclic deformation behavior and the microscopic response at the grain level was established. The neutron diffraction results indicate that more and more grains are involved in the twinning and detwinning deformation process with the increase of fatigue cycles. The residual twins appear in the early fatigue life, which is responsible for the cyclic hardening behavior. The asymmetric shape of the hysteresis loop is attributed to the early exhaustion of the detwinning process during compression, which leads to the activation of dislocation slips and rapid strain-hardening. The critical resolved shear stress for the activation of tensile twinning closely depends on the residual strain developed during cyclic loading. In the cycle before the sample fractured, the dislocation slips became active in tension, although the sample was not fully twinned. The increased dislocation density leads to the rise of the stress concentration at weak spots, which is believed to be the main reason for the fatigue failure. The deformation history greatly influences the deformation mechanisms of hexagonal-close-packed-structured magnesium alloy during cyclic loading.

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Section: Real-time In Situ Neutron Diffraction Measurementsmentioning

confidence: 99%

Unraveling cyclic deformation mechanisms of a rolled magnesium alloy using in situ neutron diffraction

Liaw

2015

Acta Materialia

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“…After a rather fast temperature rise up to 1000 • C with a heating rate of 0.1 • C/s, both samples were subjected to consecutive stepwise annealing treatments covering the temperature range of 1000-1300 • C with 3 h per 50 • C step, during which time neutron diffraction data were collected. Additional high-temperature measurements were conducted using the new VULCAN diffractometer [20,21] at the Spallation Neutron Source [22]. In situ neutron diffraction was collected during continuous heating up to 1300 • C. …”

Section: In Situ Neutron Scattering Experimentsmentioning

confidence: 99%

Unusual thermal stability of nano-structured ferritic alloys

Wang

Liu

Keiderling

et al. 2012

Journal of Alloys and Compounds

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“…[1,2] With VULCAN, users can conduct mapping of residual stresses, chemistry, microstructure, and texture, as well as dynamically measure the mechanical response, chemical transformation, and microstructure evolution under applied load, temperature, or severe processing conditions. With special sample environments, including a vacuum furnace and unique multiaxial tension-torsion load frame, VULCAN extends neutron scattering studies to broader areas of materials science and solid mechanics.…”

Section: Introductionmentioning

confidence: 99%

First In Situ Lattice Strains Measurements Under Load at VULCAN

Skorpenske

Stoica

et al. 2010

Metall Mater Trans A

213

119

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The engineering materials diffractometer, VULCAN, at the Spallation Neutron Source began commissioning on June 26, 2009. This instrument is designed for materials science and engineering studies. In situ lattice strain measurements of a model metallic material under monotonic tensile load have been performed on VULCAN. The tensile load was applied under two different strain rates, and neutron diffraction measurements were carried out in both high-intensity and high-resolution modes. These experiments demonstrated VULCAN's in situ study capability of deformation behaviors even during the early phases of commissioning.

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First Results from the VULCAN Diffractometer at the SNS

Cited by 38 publications

References 5 publications

Unraveling cyclic deformation mechanisms of a rolled magnesium alloy using in situ neutron diffraction

Unraveling cyclic deformation mechanisms of a rolled magnesium alloy using in situ neutron diffraction

Unusual thermal stability of nano-structured ferritic alloys

First In Situ Lattice Strains Measurements Under Load at VULCAN

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