In Situ Synchrotron Radiation Study of TiH2-6Al-4V and Ti-6Al-4V: Accelerated Alloying and Phase Transformation, and Formation of an Oxygen-Enriched Ti4Fe2O Phase in TiH2-6Al-4V

In this paper we study the growth of Cu x Se y and Na x Cu y Se z thin films on polycrystalline Cu substrates. The investigation took place in situ by means of photoemission spectroscopy with synchrotron radiation, in UHV. Deposition of elemental Se with a dense flux on a polycrystalline Cu substrate at RT and subsequent heating to 100°C causes the formation of a thick Cu 2-x Se film (with x equal or very close to zero). A phase transition of this copper selenide occurs by annealing at 200°C. Deposited Na on the Cu 2-x Se film is diffused into the bulk, resulting in the formation of a Na x Cu y Se z compound. Exposure to Cl 2 at 120°C causes the out-diffusion of Na to the surface, where NaCl is formed. The Na diffusion in and out of the copper selenide film is analogous to alkali intercalation–deintercalation from TX 2 layer compounds.

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In Situ Observation of Weld Solidification and Phase Transformation Process Using Synchrotron Radiation

Materials Science Forum ◽

10.4028/www.scientific.net/msf.539-543.3820 ◽

2007 ◽

Vol 539-543 ◽

pp. 3820-3825 ◽

Cited By ~ 5

Author(s):

Yuichi Komizo ◽

Hidenori Terasaki ◽

Mitsuharu Yonemura ◽

Takahiro Osuki

Keyword(s):

Phase Transformation ◽

Synchrotron Radiation ◽

Welding Process ◽

Fusion Welding ◽

Morphological Observation ◽

Observation System ◽

Imaging Plate ◽

In Situ Observation ◽

Welding Processes

In order to understand the microstructure changes during welding processes , kinetic information about the phase transformation is essential. In our research group, in-situ observation systems consisting of undulator beam and imaging plate and two dimensional pixel detector have recently been used. These make it possible that phase transformation can be identified in real-time under the condition of directional-oriented solidification . In the present work, a combination of analyzing method: the in-situ observation system by X-ray diffraction technique using intense synchrotron radiation, and morphological observation by high-temperature laser scanning confocal microscopy is suggested to analyze the phase transformation during the welding process. Using the results acquired by these analysis methods, phase evolution of hypereutectoid carbon steel, during fusion welding was analyzed. The primary phase was directly identified as an austenite phase. Precipitation of pearlite phase was observed followed by the martensitic transformation.

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Application of in situ synchrotron X-ray topography to the study of a solid-phase transformation: crystallography of the transition in pure titanium

Journal of Applied Crystallography ◽

10.1107/s0021889883011231 ◽

1983 ◽

Vol 16 (6) ◽

pp. 646-648 ◽

Cited By ~ 6

Author(s):

C. Jourdan ◽

J. Gastaldi

Keyword(s):

Phase Transformation ◽

High Temperature ◽

Synchrotron Radiation ◽

Solid Phase ◽

Pure Titanium ◽

X Ray ◽

Solid Phase Transformation

With a high-temperature camera, designed for in situ synchrotron radiation X-ray topography, the crystallography of the α → β transition in titanium has been studied.

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