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- KurzbeschreibungThe machinability of a material is an important property, with strong influence on the production costs of the machined parts. Besides the material properties, the deformation mechanisms are influenced by the process parameters like cutting speed, penetration depth and the tool geometry in macroscopic machining. In micromachining, additionally the crystallographic features of the sample have to be taken into account. If the scale of the process is in the range of the grain size of the workpiece or smaller, the crystal orientation as well as size effects may have a fundamental influence on the deformation mechanisms, as the plastic deformation generally takes place by dislocation slip in confined planes. Therefore, this manuscript deals with the question, if it is possible to utilize anisotropy effects of the workpiece material and concomitant inhomogeneous deformation mechanisms to improve the efficiency of micromachining processes, especially in single crystals and textured materials. Two technical alloys, the body centered cubic titanium alloy &8220;Ti 15-3&8221; and the face centered cubic nickel based superalloy &8220;Alloy 625&8221; were investigated.<br>As machining processes lead to highly complex stress fields in the sample, rendering a detailed analysis difficult, the mechanical properties and deformation mechanisms of the aforementioned alloys were first investigated by nanoindentation and compression of FIB machined micropillars. Thus, the fundamental mechanisms concerning the deformation behavior were determined, and applied to explain the results of microscratching experiments, which were considered as representatives of a micromachining process. The mechanical behavior of the investigated alloys was determined with respect to the crystal orientation, by performing compression experiments in crystals with different orientations. Additionally, the indentation moduli and hardness of the materials were studied with respect to the applied load to identify possible size effects.<br>In indentation, the deformation mechanisms were determined by analyzing the asymmetry of material pile-up around the imprint, as well as the orientation of the slip lines at the material surface, determined by EBSD. Moreover, the deformation mechanisms were also determined by pillar compression, allowing the calculation the critical resolved shear stress, leading to the activation of dislocation slip in the active slip system. It was therefore possible to investigate, if the peculiar deformation response of pure body centered cubic materials was also observed for highly alloyed systems like Ti 15-3
- AutorKai Nowag
- Ausgabe1. Auflage
- VerlagShaker Media Verlag
- Seiten211 Seiten
- Gewicht405 g
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