Digital Repository, ICF12, Ottawa 2009

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3D Analysis of Short Fatigue Crack Propagation in a Beta Ti alloy: Effect of the Local Crystallographic Orientation
M. Herbig, J-Y. Buffière, W. Ludwig, E.M. Lauridsen, A. King

Last modified: 2013-05-03


The influence of local crystallographic orientation on the propagation of short
fatigue cracks in a metastable beta Ti alloy was studied in three dimensions by
combining different synchrotron based characterisation methods.
First, the recently developed diffraction contrast tomography technique (DCT) [1]
was used to determine the orientation and shape of the grains (approximately
100 grains) forming the gauge volume of a fatigue sample, containing an
artificial crack nucleation site (FIB notch). Next, fatigue crack initiation and
propagation through the sample were monitored in-situ by tomography [2]. Local
crack configuration corresponding to the crossing of grain boundaries were
analysed systematically as a function of the local grain shapes and their
crystallographic orientations and compared to existing models in the litterature.

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