Characterization of the Fracture Morphology of Commercially Pure (cp)-Titanium Micro Specimens Tested by Tension-Compression Fatigue Tests

Surface modification could improve functional or mechanical properties of components, which are used for example in biotechnological or automotive applications. Thereby, small structures produced by micro milling or laser structuring processes are in the same order as the grain size. They act as geometrical notches and could reduce the mechanical properties. In this work we will show detailed investigations of the fracture morphology of tension-compression tested micro notched specimens. The fracture surfaces were analyzed with a Scanning Electron Microscope (SEM) to determine the location of the failure. Furthermore metallographic microsections of some specimens were prepared to analyze the crack growth in detail: the aim is to investigate whether the crack propagation is affected by metallurgical features, such as the crystallographic orientation of the grains or microstructural barriers like grain boundaries. With these analyses we expect to be able to correlate the different stages of crack growth. The contents of this work are part of a research topic of the Collaborative Research Centre 926 "Microscale Morphology of Component Surfaces". (C) 2014 Elsevier Ltd.