Regensburg 2022 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 10: Poster Session 1

MM 10.31: Poster

Montag, 5. September 2022, 18:00–20:00, P2

Investigation of fatigue-generated vacancies in thin metal films using nanoindenter creep tests — •My Nguyen, Thomas Brede, Jan Verhoeven, and Cynthia A. Volkert — Institute for Materials Physics, Georg-August University of Göttingen, Göttingen, Germany

It is known that vacancies are created in metals during cyclic loading, however, they have been only rarely directly detected. In this study, we develop an experimental set-up to detect fatigue generated vacancies by measuring their contribution to creep deformation. Our methodology involves performing nanoindenter creep tests on thin metal films while they are being fatigued by cyclic loading. The fatigue is realized by using delay line structures (with thin films on top) on which standing surface acoustic waves (SAW) are generated. Contributions from thermal drift during the creep tests have been minimized using a continuous stiffness measurement (CSM) method. We will describe our experimental setup and present first results.