Formation of Deformation Textures in Face-Centered-Cubic Materials Studied by In-Situ High-Energy X-Ray Diffraction and Self-Consistent Model

Silver sulfide, Ag2S, is most commonly known as the tarnish that forms on silver surfaces due to the exposure of silver to hydrogen sulfide. The mineral acanthite is a monoclinic crystalline form of Ag2S that is stable to 176°C. Upon heating above 176°C, there is a phase conversion to a body-centered cubic (bcc) form referred to as argentite. Further heating above 586°C results in conversion of the bcc phase to a face-centered cubic (fcc) phase polymorph. Both high-temperature cubic phases are solid-state silver ion conductors. In situ high-temperature X-ray diffraction was used to better understand the polymorphs of Ag2S on heating. The existing powder diffraction file (PDF) entries for the high-temperature fcc polymorph are of questionable reliability, prompting a full Rietveld structure refinement of the bcc and fcc polymorphs. Rietveld analysis was useful to show that the silver atoms are largely disordered and can only be described by unreasonably large isotropic displacement parameters or split site models.

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Study of Micromechanical Behaviour of Two Phase Polycrystalline Materials Using Diffraction and Self Consistent Model

Materials Science Forum ◽

10.4028/www.scientific.net/msf.783-786.2059 ◽

2014 ◽

Vol 783-786 ◽

pp. 2059-2064

Author(s):

Andrzej Baczmański ◽

Elżbieta Gadalińska ◽

Chedly Braham ◽

Sebastian Wroński ◽

Lea le Joncour ◽

...

Keyword(s):

Lattice Strain ◽

Polycrystalline Materials ◽

X Ray Diffraction ◽

Two Phase ◽

X Ray ◽

Consistent Model ◽

Self Consistent ◽

In Situ Deformation ◽

Specific Orientation

Diffraction methods for lattice strain measurement provide useful information concerning the nature of grains behaviour during elastoplastic deformation. The main advantage of the diffraction methods is the possibility of studying mechanical properties of polycrystalline materials separately in each phase and in groups of grains with a specific orientation. In this work we present application of the neutron and X-ray diffraction to study “in situ” deformation of two phase stainless steels during tensile loading. The experimental results are compared with self-consistent model.

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Strain Evolution of Highly Asymmetric Polycrystalline Ferroelectric Ceramics via a Self-Consistent Model and In Situ X-Ray Diffraction

Journal of the American Ceramic Society ◽

10.1111/jace.12011 ◽

2012 ◽

Vol 95 (12) ◽

pp. 3947-3954 ◽

Cited By ~ 3

Author(s):

Goknur Tutuncu ◽

Maziar Motahari ◽

Joel Bernier ◽

Mesut Varlioglu ◽

Jacob L. Jones ◽

...

Keyword(s):

Ferroelectric Ceramics ◽

X Ray Diffraction ◽

X Ray ◽

Strain Evolution ◽

Consistent Model ◽

Self Consistent

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Study of slip activity in a Mg-Y alloy by in situ high energy X-ray diffraction microscopy and elastic viscoplastic self-consistent modeling

Acta Materialia ◽

10.1016/j.actamat.2018.05.065 ◽

2018 ◽

Vol 155 ◽

pp. 138-152 ◽

Cited By ~ 32

Author(s):

Leyun Wang ◽

Zhonghe Huang ◽

Huamiao Wang ◽

Alireza Maldar ◽

Sangbong Yi ◽

...

Keyword(s):

High Energy ◽

X Ray Diffraction ◽

X Ray ◽

Slip Activity ◽

Self Consistent ◽

Diffraction Microscopy

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Hydrogen-induced structural transformation of AuCu nanoalloys probed by synchrotron X-ray diffraction techniques

Nanoscale ◽

10.1039/c3nr06327e ◽

2014 ◽

Vol 6 (8) ◽

pp. 4067-4071 ◽

Cited By ~ 13

Author(s):

M. Yamauchi ◽

K. Okubo ◽

T. Tsukuda ◽

K. Kato ◽

M. Takata ◽

...

Keyword(s):

Structural Transformation ◽

Hydrogen Atmosphere ◽

Face Centered Cubic ◽

X Ray Diffraction ◽

X Ray ◽

Face Centered

In situ X-ray diffraction measurements reveal that the transformation of a AuCu nanoalloy from a face-centered-cubic to an L10 structure is accelerated under a hydrogen atmosphere.

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In Situ X-Ray Diffraction Analysis of Face-Centered Cubic Metals Deformed at Room and Cryogenic Temperatures

Journal of Materials Engineering and Performance ◽

10.1007/s11665-019-04226-5 ◽

2019 ◽

Vol 28 (8) ◽

pp. 4658-4666

Author(s):

Marcel Tadashi Izumi ◽

John Jairo Hoyos Quintero ◽

Maicon Rogerio Crivoi ◽

Milene Yumi Maeda ◽

Ricardo Sanson Namur ◽

...

Keyword(s):

Diffraction Analysis ◽

Face Centered Cubic ◽

Cryogenic Temperatures ◽

X Ray Diffraction ◽

X Ray ◽

Cubic Metals ◽

Face Centered

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New designs of hydrophobic and mesostructured Ultra Low k materials with isolated mesopores

MRS Proceedings ◽

10.1557/opl.2011.853 ◽

2011 ◽

Vol 1335 ◽

Author(s):

Anthony Grunenwald ◽

André Ayral ◽

Pierre Antoine Albouy ◽

Vincent Rouessac ◽

David Jauffres ◽

...

Keyword(s):

Grazing Incidence ◽

Face Centered Cubic ◽

X Ray Diffraction ◽

X Ray ◽

In Situ Xrd ◽

X Ray Scattering ◽

Face Centered ◽

Film Porosity ◽

Low K

ABSTRACTIn this work, hydrophobic mesostructured organosilica thin films, exhibiting isolated mesopores (~ 7 nm), have been successfully deposited by spin-coating using different polystyrene-block-polyethylene oxide copolymers (PS-b-PEO) as structure-directing agents and methyltriethoxysilane (MTES) as organosilica precursor. Different ordered mesostructures (Face Centered Cubic, 2D or 3D Hexagonal and Body Centered Cubic) can be achieved by controlling different synthesis parameters. X-Ray Diffraction (XRD) and Grazing Incidence Small Angle X-Ray Scattering (GISAXS) techniques were used to investigate the mesostructure evolution through thermal and UV treatments. Swelling and shrinkage were evidenced by in-situ XRD and X-Ray Reflectivity measurements during the thermal removal of the meso-templates. Infrared spectroscopy and 29Si NMR were additionally used to investigate the microstructure evolution. The film porosity was estimated thanks to Ellipsometry Porosimetry (EP). Correlation between mechanical properties through nanoindentation measurements and the mesostructure ordering is discussed as well as assessments of the dielectric constant k by mercury contact probe.

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In-Situ High-Energy X-ray Diffraction Study of Austenite Decomposition During Rapid Cooling and Isothermal Holding in Two HSLA Steels

Metallurgical and Materials Transactions A ◽

10.1007/s11661-021-06192-x ◽

2021 ◽

Vol 52 (5) ◽

pp. 1812-1825

Author(s):

Sen Lin ◽

Ulrika Borggren ◽

Andreas Stark ◽

Annika Borgenstam ◽

Wangzhong Mu ◽

...

Keyword(s):

Isothermal Holding ◽

Weight Percent ◽

High Energy ◽

Decomposition Kinetics ◽

Bainitic Transformation ◽

Austenite Decomposition ◽

X Ray Diffraction ◽

Rapid Cooling ◽

X Ray

AbstractIn-situ high-energy X-ray diffraction experiments with high temporal resolution during rapid cooling (280 °C s−1) and isothermal heat treatments (at 450 °C, 500 °C, and 550 °C for 30 minutes) were performed to study austenite decomposition in two commercial high-strength low-alloy steels. The rapid phase transformations occurring in these types of steels are investigated for the first time in-situ, aiding a detailed analysis of the austenite decomposition kinetics. For the low hardenability steel with main composition Fe-0.08C-1.7Mn-0.403Si-0.303Cr in weight percent, austenite decomposition to polygonal ferrite and bainite occurs already during the initial cooling. However, for the high hardenability steel with main composition Fe-0.08C-1.79Mn-0.182Si-0.757Cr-0.094Mo in weight percent, the austenite decomposition kinetics is retarded, chiefly by the Mo addition, and therefore mainly bainitic transformation occurs during isothermal holding; the bainitic transformation rate at the isothermal holding is clearly enhanced by lowered temperature from 550 °C to 500 °C and 450 °C. During prolonged isothermal holding, carbide formation leads to decreased austenite carbon content and promotes continued bainitic ferrite formation. Moreover, at prolonged isothermal holding at higher temperatures some degenerate pearlite form.

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