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

2011 ◽  
Vol 278 ◽  
pp. 48-53 ◽  
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.

scholarly journals A Study of Recrystallization and Phase Transitions in Intermetallic Titanium Aluminides by In Situ High-Energy X-Ray Diffraction

2007 ◽  
Vol 539-543 ◽  
pp. 1519-1524 ◽  
Author(s):  
Klaus Dieter Liss ◽  
A. Bartels ◽  
Helmut Clemens ◽  
S. Bystrzanowski ◽  
A. Stark ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Titanium Aluminides ◽  
Strain Relaxation ◽  
High Energy ◽  
Internal Stresses ◽  
X Ray Diffraction ◽  
X Ray ◽  
In Situ Heating ◽  
Increasing Temperature

High-energy synchrotron X-ray diffraction is a novel and powerful tool for bulk studies of materials. In this study, it is applied for the investigation of an intermetallic γ-TiAl based alloy. Not only the diffraction angles, but also the morphology of reflections on the Debye-Scherrer rings are evaluated in order to approach lattice parameters and grain sizes as well as crystallographic relationships. An in-situ heating cycle from room temperature to 1362 °C has been conducted starting from massively transformed γ-TiAl which exhibits high internal stresses. With increasing temperature the occurrence of strain relaxation, chemical and phase separation, domain orientations, phase transitions, recrystallization processes, and subsequent grain growth can be observed. The data obtained by high-energy synchrotron X-ray diffraction, extremely rich in information, are interpreted step by step.

scholarly journals High-energy synchrotron radiation X-ray diffraction measurements during in situ aging of a NiTi-15 at. % Hf high temperature shape memory alloy

Materialia ◽  
2019 ◽  
Vol 5 ◽  
pp. 100220 ◽  
Author(s):  
Matthew Carl ◽  
Jesse Smith ◽  
Robert W. Wheeler ◽  
Yang Ren ◽  
Brian Van Doren ◽  
...  
Keyword(s):  
High Temperature ◽  
Synchrotron Radiation ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
High Energy ◽  
X Ray Diffraction ◽  
X Ray

Properties of Mbe Grown Heterostructures of GaAs/InSb and InP/InSb.

1989 ◽  
Vol 145 ◽  
Author(s):  
M. T. Asom ◽  
E. A. Fitzgerald ◽  
F. A. Thiel ◽  
R. People ◽  
D. Eaglesham ◽  
...  
Keyword(s):  
Hall Effect ◽  
Lattice Mismatch ◽  
High Energy ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
Energy Position ◽  
X Ray ◽  
Transmission Electron ◽  
Diffraction Peaks

AbstractWe have employed molecular beam epitaxy in the growth of InSb on GaAs and InP. The transport, optical and structural properties of the films were investigated by in-situ reflection high energy electron diffraction, Hall effect and temperature dependent Hall effect, photoluminescence, transmission electron microscopy and X-ray diffractometry techniques. We report mobilities of up to 32,000 cm2/volt-sec and free electron concentrations of 3x1016/cm3 at room temperature. We have discovered a new defect state in InSb with an energy position of Ec - 0.05 ± 0.006eV. Optical and structural measurements reveal that the differences in thermal expansion and lattice mismatch between the substrates and films results in the broadening of the X-ray diffraction peaks and the near gap photoluminescence linewidths. Furthermore, we observe band gap shifts to higher energies of 10meV and 20meV for growth on GaAs and InP, respectively.

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

2020 ◽  
Vol 194 ◽  
pp. 565-576 ◽  
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

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

2014 ◽  
Vol 996 ◽  
pp. 118-123 ◽  
Author(s):  
Andrzej Baczmański ◽  
Elżbieta Gadalińska ◽  
Sebastian Wroński ◽  
Chedly Braham ◽  
Wilfrid Seiler ◽  
...  
Keyword(s):  
Mechanical Behaviour ◽  
Pearlitic Steel ◽  
Tensile Tests ◽  
High Energy ◽  
Polycrystalline Materials ◽  
X Ray Diffraction ◽  
Elastoplastic Model ◽  
Synchrotron Diffraction ◽  
X Ray

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.

Time-resolved in situ powder X-ray diffraction reveals the mechanisms of molten salt synthesis

2016 ◽  
Vol 52 (96) ◽  
pp. 13865-13868 ◽  
Author(s):  
Saul J. Moorhouse ◽  
Yue Wu ◽  
Hannah C. Buckley ◽  
Dermot O'Hare
Keyword(s):  
High Temperature ◽  
Molten Salt ◽  
Powder Diffraction ◽  
High Energy ◽  
Chemical Processes ◽  
Molten Salt Synthesis ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray

We report the first use of high-energy monochromatic in situ X-ray powder diffraction to gain unprecedented insights into the chemical processes occurring during high temperature, lab-scale metal oxide syntheses.

scholarly journals In Situ Determination of Phase Stress States in an Unstable Medium Manganese Duplex Steel Studied by High-Energy X-ray Diffraction

Metals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1335
Author(s):  
Mathias Lamari ◽  
Sébastien Y. P. Allain ◽  
Guillaume Geandier ◽  
Jean-Christophe Hell ◽  
Astrid Perlade ◽  
...  
Keyword(s):  
Retained Austenite ◽  
High Strength Steels ◽  
High Strength ◽  
High Energy ◽  
Internal Stresses ◽  
X Ray Diffraction ◽  
X Ray ◽  
Advanced High Strength Steels ◽  
Stress States

Duplex medium Mn steels are high-potential advanced high-strength steels (AHSS) for automotive construction. Their excellent forming properties stem from the specific stress partitioning between their constituting phases during deformation, namely the ferritic matrix, unstable retained austenite, and strain-induced fresh martensite. The stability of the retained austenite and the 3D stress tensors of each phase are determined simultaneously in this work by in situ high energy X-ray diffraction on synchrotron beamline during a tensile test. The role of internal stresses inherited from the manufacturing stage are highlighted for the first time as well as new insights to understand the origin of the serrations shown by these alloys.

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