Dresden 2014 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 18: Poster Session
MM 18.34: Poster
Montag, 31. März 2014, 18:00–20:00, P4
In-situ TEM deformation of Ti3SiC2- MAX phase — •Mona-Christin Maaß, Burkhard Roos, and Cynthia A. Volkert — Institute of Materials Physics, Georg-August-University of Göttingen, Friedrich-Hund-Platz 1, Göttingen, Germany
MAX phases are layered alloys consisting of a transition metal, an A-group element, and carbon (or nitrogen). They are interesting candidates for technical application because of their combined properties: electrically and thermally conductive like metals, but also stiff, heat-resistant, and brittle like ceramics.
In-situ TEM experiments are performed to examine the plastic deformation of Ti3SiC2, where dislocation motion is strongly constrained in the basal planes, and to gain insights into the 2-dimensional dynamics of dislocations. For these experiments samples were prepared by conventional thinning with dimpling and Ar ion milling, and also by FIB milling. The samples contained an initial high density of dislocations and were deformed in-situ by loading them with a piezo actuated tungsten tip. These in-situ experiments showed that dislocations move under loading and are able to leave the sample at its free surfaces. Based on crystallographic investigations and TEM post-mortem analysis the slip planes and slip directions of the dislocations and their interactions with existing defects in Ti3SiC2 is discussed. Although these observations are specific to Ti3SiC2, other MAX phases are likely to behave similarly because they all have similar layered, hexagonal structures.