scholarly journals Synchrotron X-ray quantitative evaluation of transient deformation and damage phenomena in a single nickel-rich cathode particle

2020 ◽  
Vol 13 (10) ◽  
pp. 3556-3566 ◽  
Author(s):  
León Romano Brandt ◽  
John-Joseph Marie ◽  
Thomas Moxham ◽  
Dominic P. Förstermann ◽  
Enrico Salvati ◽  
...  
Keyword(s):  
Quantitative Evaluation ◽  
Lattice Strain ◽  
X Ray ◽  
Transient Deformation ◽  
Synchrotron Xrd

Operando synchrotron XRD and in situ ptycho-tomography of single NMC811 particle revealed the correlation between lattice strain and degradation.

Synchrotron Radiation Study on Alloy 617 and Alloy 230 for VHTR Application

2011 ◽  
Author(s):  
Kun Mo ◽  
Hsiao-Ming Tung ◽  
Xiang Chen ◽  
Weiying Chen ◽  
Jon B. Hansen ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Internal Stress ◽  
Applied Stress ◽  
Lattice Strain ◽  
High Energy ◽  
Uniaxial Tensile ◽  
X Ray Diffraction ◽  
Alloy 617 ◽  
X Ray

High-energy synchrotron radiation has proven to be a powerful technique for investigating fundamental deformation processes for various materials, particularly metals and alloys. In this study, high-energy synchrotron X-ray diffraction (XRD) was used to evaluate Alloy 617 and Alloy 230, both of which are top candidate structural materials for the Very-High-Temperature Reactor (VHTR). Uniaxial tensile experiments using in-situ high-energy X-ray exposure showed the substantial advantages of this synchrotron technique. First, the small volume fractions of carbides, e.g. ∼6% of M6C in Alloy 230, which are difficult to observe using lab-based X-ray machines or neutron scattering facilities, were successfully examined using high-energy X-ray diffraction. Second, the loading processes of the austenitic matrix and carbides were separately studied by analyzing their respective lattice strain evolutions. In the present study, the focus was placed on Alloy 230. Although the Bragg reflections from the γ matrix behave differently, the lattice strain measured from these reflections responds linearly to external applied stress. In contrast, the lattice strain evolution for carbides is more complicated. During the transition from the elastic to the plastic regime, carbide particles experience a dramatic loading process, and their internal stress rapidly reaches the maximum value that can be withstood. The internal stress for the particles then decreases slowly with increasing applied stress. This indicates a continued particle fracture process during plastic deformations of the γ matrix. The study showed that high-energy synchrotron X-ray radiation, as a non-destructive technique for in-situ measurement, can be applied to ongoing material research for nuclear applications.

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

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.

scholarly journals Lattice Strain Evolutions in Ni-W Alloys during a Tensile Test Combined with Synchrotron X-ray Diffraction

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4027
Author(s):  
Tarik Sadat ◽  
Damien Faurie ◽  
Dominique Thiaudière ◽  
Cristian Mocuta ◽  
David Tingaud ◽  
...  
Keyword(s):  
Solid Solution ◽  
Tensile Test ◽  
Single Phase ◽  
Lattice Strain ◽  
Tensile Tests ◽  
X Ray Diffraction ◽  
X Ray ◽  
Significant Difference ◽  
Diffraction Peaks

Ni and Ni(W) solid solution of bulk Ni and Ni-W alloys (Ni-10W, Ni-30W, and Ni-50W) (wt%) were mechanically compared through the evolution of their {111} X-ray diffraction peaks during in situ tensile tests on the DiffAbs beamline at the Synchrotron SOLEIL. A significant difference in terms of strain heterogeneities and lattice strain evolution occurred as the plastic activity increased. Such differences are attributed to the number of brittle W clusters and the hardening due to the solid solution compared to the single-phase bulk Ni sample.

Interpretation of Diffraction Data from In Situ Stress Measurements during Biaxial Sheet Metal Forming

2013 ◽  
Vol 768-769 ◽  
pp. 441-448
Author(s):  
Thomas Gnäupel-Herold ◽  
Mark Iadicola ◽  
Adam Creuziger ◽  
Tim Foecke ◽  
Lin Hu
Keyword(s):  
Sheet Metal Forming ◽  
Metal Forming ◽  
Lattice Strain ◽  
Hybrid Approach ◽  
Yield Behavior ◽  
Strain Measurements ◽  
X Ray ◽  
Lattice Strains ◽  
Model Predictions

Biaxial yield behavior is determined in-situ through X-ray lattice strain measurements. The distributions of d-spacings in different sample directions is affected both by the changes in diffraction elastic constants (DEC) from evolving texture and by the intergranular (IG) strains. Model predictions were found to be lacking, thus, a hybrid approach was developed based on measurements of DEC and IG strains at selected biaxial deformations. In order to convert measured lattice strains to stress for any given biaxial plastic strain a theoretical approximation was fitted to the experimental data, thus allowing the estimation of the evolution of DEC and IG strains with plastic deformation.

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