Berlin 2012 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 57: Complex Materials I
MM 57.2: Vortrag
Donnerstag, 29. März 2012, 16:00–16:15, H 1029
Studying plastic deformation in brittle complex metal alloys: deformation of Al13Co4 at room temperature — •Sandra Korte1,2, Volker Schnabel2, and William J Clegg2 — 1Friedrich Alexander Universität Erlangen-Nürnberg, Erlangen, Deutschland — 2University of Cambridge, Cambridge, UK
In this paper the low temperature deformation behaviour of single crystals of orthorhombic Al13Co4 has been studied using micropillar compression. This technique allows the study of plasticity by suppressing cracking in brittle materials as the sample size is reduced to a few microns. Therefore, a polycrystal of sufficient grain size allows the milling of micropillars as single crystalline samples and the selection of different crystal orientations by correlation with electron backscattered diffraction. The plastic deformation of such small single crystals has been studied in terms of the stresses involved and structures observed by scanning and transmission electron microscopy after deformation. It was found that features correlating to crystallographic slip on the glide planes expected based on experiments at higher temperatures mainly occurred where these were oriented favourably, with a high resolved shear stress. In other orientations deformation bands were observed to form on planes of maximum shear stress. This is discussed in the light of the deformation morphology, strain-rate dependence and similar deformation signatures found in bulk metallic glasses.