Texture Evolution Under Fast Heating and Cooling Rates of Zirconium Alloys Studied In-Situ by Synchrotron X-Ray Diffraction

2020 ◽  
Author(s):  
Chi-Toan Nguyen ◽  
Alistair Garner ◽  
Javier Romero ◽  
Antoine Ambard ◽  
Michael Preuss ◽  
...  
Keyword(s):  
Texture Evolution ◽  
Zirconium Alloys ◽  
X Ray Diffraction ◽  
Fast Heating ◽  
Cooling Rates ◽  
X Ray ◽  
Heating And Cooling

Phase Transitions in Gold Contacts to Gallium Arsenide

1984 ◽  
Vol 37 ◽  
Author(s):  
Edward Beam ◽  
D. D. L. Chung
Keyword(s):  
Gallium Arsenide ◽  
Phase Transitions ◽  
Peritectic Transformation ◽  
Complete Dissolution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Heating And Cooling ◽  
Similar Phase ◽  
Gold Contacts

AbstractX-ray diffraction was used in situ to study the phase transitions which occurred in 1500 Å Au/GaAs(100) upon heating and cooling. The reaction between Au and GaAs took the form Au + Ga → α Au-Ga. Upon heating, α Au-Ga completely dissolved in liquid Au-Ga. Upon subsequent cooling, β Au-Ga (or Au7Ga2) formed. In 1 atm of nitrogen, phase transitions were observed reversibly at 525 ± 25°C (due to the complete dissolution of α Au-Ga upon heating) and 415 ± 5°C (due to the peritectic transformation of β Au-Ga to α Au-Ga and liquid Au-Ga upon heating). In a vacuum of 425 μ (0.031 Kg/2m) similar phase transitions were observed at 425 ± 25°C and 387 ± 13°C, respectively.

scholarly journals Texture evolution of orthorhombic α″ titanium alloy investigated by in situ X-ray diffraction

2017 ◽  
Vol 679 ◽  
pp. 504-510 ◽  
Author(s):  
W. Elmay ◽  
S. Berveiller ◽  
E. Patoor ◽  
T. Gloriant ◽  
F. Prima ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Texture Evolution ◽  
X Ray Diffraction ◽  
X Ray

scholarly journals In situ x-ray diffraction study of graphitic carbon formed during heating and cooling of amorphous-C/Ni bilayers

2010 ◽  
Vol 96 (15) ◽  
pp. 153105 ◽  
Author(s):  
K. L. Saenger ◽  
J. C. Tsang ◽  
A. A. Bol ◽  
J. O. Chu ◽  
A. Grill ◽  
...  
Keyword(s):  
Diffraction Study ◽  
Graphitic Carbon ◽  
X Ray Diffraction ◽  
X Ray ◽  
Heating And Cooling

In situ x-ray diffraction of solution-derived ferroelectric thin films for quantitative phase and texture evolution measurement

2012 ◽  
Vol 112 (10) ◽  
pp. 104109 ◽  
Author(s):  
Krishna Nittala ◽  
Sungwook Mhin ◽  
Jacob L. Jones ◽  
Douglas S. Robinson ◽  
Jon F. Ihlefeld ◽  
...  
Keyword(s):  
Thin Films ◽  
Texture Evolution ◽  
Ferroelectric Thin Films ◽  
X Ray Diffraction ◽  
X Ray ◽  
Quantitative Phase

scholarly journals Sample chamber for synchrotron based in-situ X-ray diffraction experiments under electric fields and temperatures between 100 K and 1250 K

2021 ◽  
Vol 28 (1) ◽  
pp. 158-168
Author(s):  
Melanie Nentwich ◽  
Tina Weigel ◽  
Carsten Richter ◽  
Hartmut Stöcker ◽  
Erik Mehner ◽  
...  
Keyword(s):  
Electric Fields ◽  
Degrees Of Freedom ◽  
X Ray Diffraction ◽  
X Ray ◽  
Heating And Cooling ◽  
Hemispherical Dome ◽  
Sample Chamber ◽  
Overall Performance ◽  
Scientific Questions

Many scientific questions require X-ray experiments conducted at varying temperatures, sometimes combined with the application of electric fields. Here, a customized sample chamber developed for beamlines P23 and P24 of PETRA III at DESY to suit these demands is presented. The chamber body consists mainly of standard vacuum parts housing the heater/cooler assembly supplying a temperature range of 100 K to 1250 K and an xyz manipulator holding an electric contact needle for electric measurements at both high voltage and low current. The chamber is closed by an exchangeable hemispherical dome offering all degrees of freedom for single-crystal experiments within one hemisphere of solid angle. The currently available dome materials (PC, PS, PEEK polymers) differ in their absorption and scattering characteristics, with PEEK providing the best overall performance. The article further describes heating and cooling capabilities, electric characteristics, and plans for future upgrades of the chamber. Examples of applications are discussed.

Austenite-Ferrite Transformation in Non-Oriented Electrical Steels

2007 ◽  
Vol 560 ◽  
pp. 85-89
Author(s):  
Enrique Díaz Barriga-Castro ◽  
Armando Salinas-Rodríguez ◽  
Enrique Nava-Vázquez
Keyword(s):  
Electrical Steel ◽  
Tensile Ductility ◽  
X Ray Diffraction ◽  
Electrical Steels ◽  
Transformation Temperatures ◽  
X Ray ◽  
Heating And Cooling ◽  
Ferrite Transformation ◽  
Isothermal Heat Treatments

The aim of the present work is to determine the austenite to ferrite transformation temperatures in a Si-Al non-oriented electrical steel. Critical transformation temperatures on heating and cooling are determined using an in-situ X-ray diffraction technique where the specimen is heated or cooled in a stepwise manner. The transformation temperatures are estimated from changes in the intensities of the (110)α and (111)γ peaks as a function of temperature. The time evolution of the microstructure resulting from isothermal heat treatments at temperatures between 800 and 1000 °C applied after cooling from 1050 °C is followed by quantitative metallography on samples quenched into water. The results show that, on cooling, formation of ferrite starts at about 950 °C and ends at 790 °C, indicating a strong effect of Si and Al on the austenite to ferrite and eutectoid transformations. These results suggest that the low tensile ductility exhibited by this material at temperatures near 1000 °C can be attributed to strain localization in strain-induced ferrite formed at temperatures as high as 1025 °C.

scholarly journals A compact and flexible induction furnace for in situ X-ray microradiograhy and computed microtomography at Elettra: design, characterization and first tests

2018 ◽  
Vol 25 (4) ◽  
pp. 1172-1181 ◽  
Author(s):  
Marko Kudrna Prašek ◽  
Mattia Pistone ◽  
Don R. Baker ◽  
Nicola Sodini ◽  
Nicoletta Marinoni ◽  
...  
Keyword(s):  
Induction Furnace ◽  
Fast Heating ◽  
X Ray ◽  
Precise Control ◽  
Heating And Cooling ◽  
Solidification Processes ◽  
Computed Microtomography ◽  
Internal Volume ◽  
Melting And Solidification

A compact and versatile induction furnace for in situ high-resolution synchrotron and laboratory hard X-ray microradiography and computed microtomography is described. The furnace can operate from 773 to 1723 K. Its programmable controller enables the user to specify multiple heating and cooling ramp rates as well as variable dwell times at fixed temperatures allowing precise control of heating and cooling rates to within 5 K. The instrument can work under a controlled atmosphere. Thanks to the circular geometry of the induction coils, the heat is homogeneously distributed in the internal volume of the graphite cell (ca. 150 mm3) where the sample holder is located. The thermal gradient within the furnace is less than 5 K over a height of ca. 5 mm. This new furnace design is well suited to the study of melting and solidification processes in geomaterials, ceramics and several metallic alloys, allowing fast heating (tested up to 6.5 K s−1) and quenching (up to 21 K s−1) in order to freeze the sample microstructure and chemistry under high-temperature conditions. The sample can be held at high temperatures for several hours, which is essential to follow phenomena with relatively slow dynamics, such as crystallization processes in geomaterials. The utility of the furnace is demonstrated through a few examples of experimental applications performed at the Elettra synchrotron laboratory (Trieste, Italy).

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