Study of Mechanical Behaviour of Polycrystalline Materials at the Mesoscale Using High Energy X-Ray Diffraction

Owing to its selectivity, diffraction is a powerful tool for analysing the mechanical behaviour of polycrystalline materials at the mesoscale, i.e. phase and grain scale. In situ synchrotron diffraction (transmission mode) during tensile tests and modified self-consistent elastoplastic model were used to study elastic and plastic phenomena occurring in polycrystalline specimens during deformation. The evolution of stress for grains which belong to different phases of duplex stainless steel and pearlitic steel was analyzed.

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In situ high-energy synchrotron X-ray diffraction studies and first principles modeling of α-MnO2 electrodes in Li–O2 and Li-ion coin cells

Journal of Materials Chemistry A ◽

10.1039/c4ta06633b ◽

2015 ◽

Vol 3 (14) ◽

pp. 7389-7398 ◽

Cited By ~ 33

Author(s):

Zhenzhen Yang ◽

Lynn Trahey ◽

Yang Ren ◽

Maria K. Y. Chan ◽

Chikai Lin ◽

...

Keyword(s):

First Principles ◽

Structural Changes ◽

High Energy ◽

X Ray Diffraction ◽

Synchrotron Diffraction ◽

X Ray ◽

Li Ion ◽

Battery Cells

In situ synchrotron diffraction and first principles modeling shows structural changes in α-MnO2 during cycling in Li–O2 battery cells, as lithium and oxygen are incorporated into and removed from tunnels in the structure.

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In Situ Measurement of Internal Stresses and Strain Rates by High Energy X-Ray Diffraction during High Temperature Mechanical Testing

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.278.48 ◽

2011 ◽

Vol 278 ◽

pp. 48-53 ◽

Cited By ~ 7

Author(s):

Alain Jacques ◽

Laura Dirand ◽

Jean Philippe Chateau ◽

Thomas Schenk ◽

Olivier Ferry ◽

...

Keyword(s):

High Temperature ◽

Mechanical Behaviour ◽

Lattice Mismatch ◽

High Energy ◽

Internal Stresses ◽

Strain Rates ◽

X Ray Diffraction ◽

Experimental Conditions ◽

X Ray

The combination of high temperature (1050°C -1150°C) testing and in situ high energy X-Ray diffraction measurements using synchrotron Three Crystal Diffractometry may give various insights into the mechanical behaviour of superalloys: measurement of the lattice mismatch, order within the ' phase, elastic constants, and dynamic response to changes in the experimental conditions. Several examples are given on the rafted AM1 superalloy, resulting from experiments at the ID15A (ESRF) and BW5 (DESY) high energy beamlines.

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In-situ synchrotron high energy X-ray diffraction study of micro-mechanical behaviour of R phase reorientation in nanocrystalline NiTi alloy

Acta Materialia ◽

10.1016/j.actamat.2020.05.004 ◽

2020 ◽

Vol 194 ◽

pp. 565-576 ◽

Cited By ~ 2

Author(s):

Bo Feng ◽

Xiangguang Kong ◽

Shijie Hao ◽

Yinong Liu ◽

Ying Yang ◽

...

Keyword(s):

Diffraction Study ◽

Mechanical Behaviour ◽

Niti Alloy ◽

High Energy ◽

X Ray Diffraction ◽

X Ray

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Multi length scale characterization of austenite in TRIP steels using high-energy X-ray diffraction

Powder Diffraction ◽

10.1017/s0885715613000237 ◽

2013 ◽

Vol 28 (2) ◽

pp. 77-80 ◽

Cited By ~ 1

Author(s):

R. Blondé ◽

E. Jimenez-Melero ◽

L. Zhao ◽

J.P. Wright ◽

E. Brück ◽

...

Keyword(s):

Volume Fraction ◽

Tensile Tests ◽

High Energy ◽

X Ray Diffraction ◽

X Ray ◽

Trip Steels ◽

Stable Austenite ◽

Scale Characterization ◽

The Stability

The martensitic transformation behavior of the meta-stable austenite phase in low alloyed TRIP steels has been studied in situ using high-energy X-ray diffraction during deformation. The stability of austenite has been studied at different length scales during tensile tests and at variable temperatures down to 153 K. A powder diffraction analysis has been performed to correlate the macroscopic behavior of the material to the observed changes in the volume fraction of the phases. Our results show that at lower temperatures the deformation induced austenite transformation is significantly enhanced and extends over a wider deformation range, resulting in a higher elongation at fracture. To monitor the austenite behavior at the level of an individual grain a high-resolution far-field detector was used. Sub-grains have been observed in austenite prior to transformation.

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In-Situ Synchrotron High Energy X-Ray Diffraction Study of Micro-Mechanical Behaviour of R Phase Reorientation in Nanocrystalline NiTi Alloy

SSRN Electronic Journal ◽

10.2139/ssrn.3499094 ◽

2019 ◽

Author(s):

Bo Feng ◽

Xiangguang Kong ◽

Shijie Hao ◽

Yinong Liu ◽

Ying Yang ◽

...

Keyword(s):

Diffraction Study ◽

Mechanical Behaviour ◽

Niti Alloy ◽

High Energy ◽

X Ray Diffraction ◽

X Ray

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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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