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MM: Fachverband Metall- und Materialphysik

MM 4: Microstructure and Phase Transformations - Characterization

MM 4.3: Vortrag

Montag, 16. März 2020, 10:45–11:00, IFW B

Investigation of irradiation damage in thin plates of Ti6Al4V via high-energy x-ray diffraction — •Tim Lengler^1,4, Dieter Lott¹, Peter Staron¹, Emad Maawad¹, Sabine Riemann², Andriy Ushakov³, and Gudrid Moortgat-Pick^3,4 — ¹Institute of Material Research, Helmholtz-Zentrum Geesthacht, Germany — ²Deutsches Elektronen-Synchrotron (DESY), Zeuthen, Germany — ³Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany — ⁴Universität Hamburg, Hamburg, Germany

In order to ensure stable long-term operation of the planned positron source for the International Linear Collider (ILC), candidate materials for the conversion target have to be tested. The intense electron beam at the Mainz Microtron (MAMI) injector was used for first irradiation tests on thin plates of Ti6Al4V which is a promising candidate material for the positron conversion target as well as for the exit window to the photon beam absorber. In this work, the beforehand at MAMI irradiated plates, simulating realistic irradiation impacts as expected at the ILC, were studied via high-energy synchrotron diffraction in transmission geometry at the P07 beamline at PETRA III to investigate the potential irradiation damage. Complementary, standard source x-ray diffraction measurements were carried out in reflection geometry to gain sensitivity for surface modifications. The synchrotron and x-ray studies allow us to investigate the microstructure in a non-destructive way and, in particular, to observe changes in the phase composition and the grain size distribution due to irradiation that may compromise the long-term stability of the material.