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MM: Fachverband Metall- und Materialphysik
MM 15: Poster session I
MM 15.36: Poster
Montag, 7. März 2016, 18:00–20:00, Poster B3
Push-Out Behavior of Tungsten Fiber-Reinforced Tungsten — •Bruno Jasper1, Stephan Schönen2, Jan W. Coenen1, Till Höschen3, Johann Riesch3, Rudolf Neu3,4, and Christian Linsmeier1 — 1FZ Jülich GmbH, IEK4 - Plasmaphysik, Jülich, GER — 2FZ Jülich GmbH, ZEA1 - Engineering und Technologie, Jülich, GER — 3IPP, Garching, GER — 4TU München, Garching, GER
Tungsten (W) with its many beneficial properties, ranging from low hydrogen retention to low erosion yields during plasma exposure, is the candidate material for first-wall application in future fusion powerplants. The major drawback when working with W is its high ductile to brittle transition temperature. To circumvent this and to improve the overall mechanical properties, a tungsten fiber-reinforced tungsten (Wf/W) composite material is under development. Wf/W is composed of a drawn W wire, coated with an interface layer, and a W matrix. If a crack is introduced into the material energy dissipation mechanisms are enabled by the interface. They lower the crack tip energy, leading to extrinsic toughening and therefore to a pseudo-ductile behavior of the material.
For better understanding and more insight into the underlaying micro-mechanisms, push-out tests on single-fiber Wf/W samples were performed. This experimental work, that also covers the influence of sample geometry, sample preparation and test setup, is compared to results of dedicated finite element models.