VULCAN: A “hammer” for high-temperature materials research

An, Ke; Chen, Yan; Stoica, Alexandru Dan

doi:10.1557/mrs.2019.256

Cited by 57 publications

(25 citation statements)

References 66 publications

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“…In-situ thermal cycling neutron experiments were performed under the stress-free condition in an air atmosphere using the mechanical testing system on the VULCAN engineering materials diffractometer at the Spallation Neutron Source of the Oak Ridge National Laboratory ( Fig. 1 d) [ 23 , 24 ]. An induction heating coil was used to control the heating and cooling with a thermocouple attached to the sample.…”

Section: Methodsmentioning

confidence: 99%

Unravelling thermal history during additive manufacturing of martensitic stainless steel

Chae

Huang

Woo

et al. 2021

Journal of Alloys and Compounds

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Section: Methodsmentioning

confidence: 99%

Unravelling thermal history during additive manufacturing of martensitic stainless steel

Chae

Huang

Woo

et al. 2021

Journal of Alloys and Compounds

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“…The phase composition and lattice parameters of the SLSed BaTiO 3 were further analyzed using neutron diffraction at VULCAN at the Spallation Neutron Source, Oak Ridge National Laboratory. 34,35 The SLSed specimen was ground into powders and loaded in a vanadium can. Neutron diffraction patterns were collected with a center wavelength at 2.0 Å, which allows a measurable d-spacing from 0.5 to 2.4 Å. Rietveld refinement of the neutron diffraction pattern were performed using the General Structure Analysis System (GSAS) through the EXPGUI interface.…”

Section: Methodsmentioning

confidence: 99%

Direct selective laser sintering of hexagonal barium titanate ceramics

Zhang

Wang

et al. 2020

J. Am. Ceram. Soc.

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Barium titanate (BaTiO 3) are functional ceramics with attractive ferroelectric and piezoelectric properties, 1-3 which enable their broad applications such as acoustic imaging, chip capacitors, and dynamic access memories. 4,5 The phase transformation of BaTiO 3 occurs with the temperatures: rhombohedral to orthorhombic at ~−90°C, orthorhombic to tetragonal at ~0°C, tetragonal to cubic at ~120°C, and cubic to hexagonal at ~1460 o C. 6-8 Among these five polymorphs, tetragonal (t-BaTiO 3) phase is used to prepare piezoelectric ceramics with high piezoelectric coefficients and dielectric constants (d 33 ~ 1500 to 500 pC/N, and ε′ ~ 3000 to 6800 at a frequency range from 0.1 to 10 kHz, 25ºC). 9-11 In contrast, hexagonal BaTiO 3 (h-BaTiO 3) is a high-temperature phase that is usually metastable at room temperature. Li et al suggested that the hexagonal phase can be stabilized at room temperature via the substitution of Cr and Sb for Ti. 12 Regarding the dielectric properties, Akishige et al reported that single-crystal h-BaTiO 3 grown from the molten phase had a low dielectric constant (ε′ < 2200 at 1 kHz). 13 Later, Yu et al synthesized h-BaTiO 3 crystals using a pressurized

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“…The use of neutron diffraction was selected for the present study due to the penetration depth of neutrons and resolution power of crystallographically equivalent high order peaks. Tensile specimens were deformed on the VULCAN neutron diffractometer 29,41 at the Spallation Neutron Source (SNS) at the Oak Ridge National Laboratory. A detailed description of the tensile loading procedures has been provided in prior work 23,33 .…”

Section: Methodsmentioning

confidence: 99%

Correlating work hardening with co-activation of stacking fault strengthening and transformation in a high entropy alloy using in-situ neutron diffraction

Frank

Nene

Chen

et al. 2020

Sci Rep

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Transformation induced plasticity (TRIP) leads to enhancements in ductility in low stacking fault energy (SFE) alloys, however to achieve an unconventional increase in strength simultaneously, there must be barriers to dislocation motion. While stacking faults (SFs) contribute to strengthening by impeding dislocation motion, the contribution of SF strengthening to work hardening during deformation is not well understood; as compared to dislocation slip, twinning induced plasticity (TWIP) and TRIP. Thus, we used in-situ neutron diffraction to correlate SF strengthening to work hardening behavior in a low SFE Fe40Mn20Cr15Co20Si5 (at%) high entropy alloy, SFE ~ 6.31 mJ m−2. Cooperative activation of multiple mechanisms was indicated by increases in SF strengthening and γ-f.c.c. → ε-h.c.p. transformation leading to a simultaneous increase in strength and ductility. The present study demonstrates the application of in-situ, neutron or X-ray, diffraction techniques to correlating SF strengthening to work hardening.

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VULCAN: A “hammer” for high-temperature materials research

Abstract: Abstract

Cited by 57 publications

References 66 publications

Unravelling thermal history during additive manufacturing of martensitic stainless steel

Unravelling thermal history during additive manufacturing of martensitic stainless steel

Direct selective laser sintering of hexagonal barium titanate ceramics

Correlating work hardening with co-activation of stacking fault strengthening and transformation in a high entropy alloy using in-situ neutron diffraction

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