5-9 September 2016
Prague Congress Centre
Europe/Prague timezone

P1.101 Characterization of the particles dispersion in W-Ti and W-V alloys by SANS

5 Sep 2016, 14:20
1h 40m
Foyer 2A (2nd floor), 3A (3rd floor) (Prague Congress Centre)

Foyer 2A (2nd floor), 3A (3rd floor)

Prague Congress Centre

5. května 65, Prague, Czech Republic
Board: 101
Poster F. Plasma Facing Components P1 Poster session

Speaker

Angel Munoz (Departamento de Física)

Description

In the last years, W and W-Ti and W-V alloys, with grain sizes of hundreds of nanometers and densification very close to 100%, have been produced following a powder metallurgy route that consists of mechanical alloying and consolidation by hot isostatic pressing (HIP). In spite of the submicron-grained microstructure, and the dispersion of second phase nanoparticles, these alloys do not exhibit a significant ductility enhancement with respect to pure tungsten. A relevant microstructural feature in the W-4Ti alloys that might give account for the mechanical behavior is the Ti segregation in large pools and dispersed particles with a wide range of sizes. The same has been found for the W-V alloys. The goal of the present study has been to study the size distribution of the second phase nanoparticles dispersed in W-Ti and W-V alloys using the Small Angle Neutron Scattering (SANS) technique. Unlikely other techniques, as Electron Transmission Microscopy (TEM) or atom probe tomography (APT), SANS allows to obtain information about a macroscopic volume of the material. W-xwt%Ti and W-xwt%V alloys (x=2 and 4) have been produced by mechanical alloying and HIP. The SANS experiments were carried out in the KWS-2 spectrometer of the FRMII at Garching (Germany) using a wave-length of 7 Å. The analyses of the scattering curves in terms of a polydisperse particle system using the Beaucage approach suggest that the particle dispersions may consist of two structural levels, or particle populations. The experimental data have also been analyzed by the maximum entropy method.

Co-authors

Angel Munoz (Departamento de Física, Universidad Carlos III, Avda de la Universidad, 30 28911-Leganés, Spain) Begona Savoini (Departamento de Física, Universidad Carlos III, Avda de la Universidad, 30 28911-Leganés, Spain) Miguel Angel Monge (Departamento de Física, Universidad Carlos III, Avda de la Universidad, 30 28911-Leganés, Spain) Ramiro Pareja (Departamento de Física, Universidad Carlos III, Avda de la Universidad, 30 28911-Leganés, Spain)

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