scholarly journals In-Situ Synchrotron X-Ray Diffraction of Ti-6Al-4V During Thermomechanical Treatment in the Beta Field

Metals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 862 ◽  
Author(s):  
Warchomicka ◽  
Canelo-Yubero ◽  
Zehetner ◽  
Requena ◽  
Stark
Keyword(s):  
Heat Treatment ◽  
Dynamic Recovery ◽  
Isothermal Heat Treatment ◽  
Strain Rates ◽  
X Ray Diffraction ◽  
Slow Cooling ◽  
X Ray ◽  
Restoration Mechanism ◽  
Conventional Microscopy

This work aims to identify the mechanisms of restoration occurring in Ti-6Al-4V during hot plastic deformation and subsequent heat treatment. The allotropic phase transformation that occurs during cooling distorts the interpretation of the restoration mechanisms taking place at high temperatures. Therefore, analysis of deformed samples by conventional microscopy have led to controversies in the interpretation of the main dynamic restoration mechanism. Additionally, static restoration of the microstructure can occur during slow cooling, modifying the microstructure. These facts were mainly the reasons why discontinuous dynamic recrystallization and/or dynamic recovery has been reported as the main dynamic restoration mechanism for Ti-6Al-4V. In this work, we use in-situ synchrotron X-ray diffraction combined with conventional microscopy to determine the dynamic and static mechanisms of restoration during and after deformation at different strain rates. The results show dynamic recovery as main mechanism of restoration during deformation in the β field, denoted by sub-grain formation and a misorientation dependency of the strain rate. After deformation, static recrystallization, grain growth, and coarsening of the β grains can be observed, especially at strain rates higher than 0.1s−1. It is also demonstrated that the nucleation of new grains can occur within the very first seconds of the isothermal heat treatment.

In Situ X-Ray Diffraction Studies of Crystallization Growth Behavior in ZnO-Bi2O3-B2O3 Glass as a Route to Functional Optical Devices

MRS Advances ◽  
2018 ◽  
Vol 3 (11) ◽  
pp. 563-567 ◽  
Author(s):  
Quentin Altemose ◽  
Katrina Raichle ◽  
Brittani Schnable ◽  
Casey Schwarz ◽  
Myungkoo Kang ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Glass Ceramics ◽  
Treatment Temperature ◽  
Crystal Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
In Situ Xrd ◽  
Dsc Measurements ◽  
Transmission Window

ABSTRACTTransparent optical ZnO–Bi2O3–B2O3 (ZBB) glass-ceramics were created by the melt quenching technique. In this work, a melt of the glass containing stoichiometric ratios of Zn/Bi/B and As was studied. Differential scanning calorimeter (DSC) measurements was used to measure the thermal behavior. VIS/NIR transmission measurements were used to determine the transmission window. X-ray diffraction (XRD) was used to determine crystal phase. In this study, we explore new techniques and report a detailed study of in-situ XRD of the ZBB composition in order to correlate nucleation temperature, heat treatment temperature, and heat treatment duration with induced crystal phase.

In situ X-ray diffraction study of crystallization process of GeSbTe thin films during heat treatment

2005 ◽  
Vol 244 (1-4) ◽  
pp. 281-284 ◽  
Author(s):  
Naohiko Kato ◽  
Ichiro Konomi ◽  
Yoshiki Seno ◽  
Tomoyoshi Motohiro
Keyword(s):  
Thin Films ◽  
Heat Treatment ◽  
Diffraction Study ◽  
Crystallization Process ◽  
X Ray Diffraction ◽  
X Ray

Phase evolution of (Ni, Co, Mn)O4 during heat treatment with high temperature in situ X-ray diffraction

2016 ◽  
Vol 42 (4) ◽  
pp. 5412-5417 ◽  
Author(s):  
Sungwook Mhin ◽  
HyukSu Han ◽  
Donghyun Kim ◽  
Sunghwan Yeo ◽  
Jung-Il Lee ◽  
...  
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Phase Evolution ◽  
X Ray Diffraction ◽  
X Ray

scholarly journals Fabrication and Crystallization of ZnO-SLS Glass Derived Willemite Glass-Ceramics as a Potential Material for Optics Applications

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Mohd Hafiz Mohd Zaid ◽  
Khamirul Amin Matori ◽  
Sidek Hj. Abdul Aziz ◽  
Halimah Mohamed Kamari ◽  
Wan Mahmood Mat Yunus ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Glass Ceramic ◽  
Glass Ceramics ◽  
Structural Evolution ◽  
Linear Shrinkage ◽  
Treatment Temperature ◽  
Isothermal Heat Treatment ◽  
X Ray Diffraction ◽  
X Ray ◽  
Zinc Orthosilicate

Willemite glass-ceramics were successfully derived from conventional melt-quench ZnO-SLS precursor glass by an isothermal heat treatment process. The effect of heat treatment temperatures on the physical properties was investigated by Archimedes principle and linear shrinkage. The generation of willemite crystal phase and morphology with increase in heat treatment temperature was examined by X-ray diffraction (XRD), Fourier transform infrared (FTIR), and field emission scanning electron microscopy (FESEM) techniques. X-ray diffraction revealed that the metastableβ-Zn2SiO4and thermodynamically stable zinc orthosilicateα-Zn2SiO4phases can be observed at temperatures above 700°C. The experimental results indicated that the density and shrinkage of the glass-ceramic vary with increasing the sintering temperature. FTIR studies showed that the structure of glass-ceramic consists of SiO2and ZnO4units and exhibits the structural evolution of willemite glass-ceramics. The characteristic of strong vibrational bands can be related to theSiO44-tetrahedron corresponding to reference spectra of willemite.

D-6 Fast In-Situ X-ray Diffraction Stress Analysis During Heat Treatment Cycles of Steel

2004 ◽  
Vol 19 (2) ◽  
pp. 198-198
Author(s):  
T. K. Hirsch ◽  
A. Da Silva Rocha
Keyword(s):  
Heat Treatment ◽  
Stress Analysis ◽  
X Ray Diffraction ◽  
X Ray

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.

Non-destructive measurement of the depth profile of the constituent in iron oxide scale by X-ray diffraction at SPring-8

2011 ◽  
Vol 1 (SRMS-7) ◽  
Author(s):  
M. Sato ◽  
T. Doi ◽  
Y. Hidaka ◽  
Y. Higashida ◽  
Y. Masaki ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Iron Oxide ◽  
Volume Fraction ◽  
Diffraction Measurement ◽  
Isothermal Heat Treatment ◽  
Oxide Scales ◽  
X Ray Diffraction ◽  
X Ray ◽  
Destructive Measurement ◽  
Non Destructive

The depth profiles of the constituent in iron oxide scales were investigated by X-ray diffraction measurement with controlling X-ray penetration depth at SPring-8. We successfully observed the interface region of scales non-destructively using X-ray with energy of 28 keV. The results indicated that the volume fraction ratio of Fe3O4 to FeO around the surface of samples increased by isothermal heat treatment. This suggested that the transformation of FeO to Fe3O4 due to isothermal heat treatment proceeds from surface into the inside of scale.

Phase Transformation and Structural Studies of EUROFER RAFM Alloy

2006 ◽  
Vol 514-516 ◽  
pp. 500-504 ◽  
Author(s):  
A. Paúl ◽  
A. Beirante ◽  
Nuno Franco ◽  
Eduardo Alves ◽  
José Antonio Odriozola
Keyword(s):  
High Temperature Phase ◽  
Temperature Phase ◽  
X Ray Diffraction ◽  
High Concentration ◽  
Slow Cooling ◽  
Austenitic Phase ◽  
Full Transformation ◽  
X Ray ◽  
Rafm Steel

High temperature phase transformations in EUROFER reduced activation ferritic martensitic (RAFM) steel were studied in-situ by means of X-ray diffraction. Results show that, during slow cooling, the austenite to ferrite transformation takes place around 755 oC. Full transformation of the austenitic phase into pure martensite is observed for cooling above 5 oC/min. This transformation was found in samples annealed at 950 oC for 3 h and quenched in liquid nitrogen. TEM analyses reveal a high concentration of carbides along the grain boundaries of the martensitic structure. The thermal expansion coefficient derived from the measurements was 12.7x10-6 K-1.

Sign in / Sign up

Export Citation Format

Share Document