Abstract
By means of electron back scattered diffraction (EBSD) in the scanning electron microscope (SEM) microstructurally short fatigue crack initiation and propagation has been characterised in the metastable beta-titanium alloy TIME-TAL®LCB (Ti-6.8Mo-4.5Fe-1.5AI). It was shown that local crystallographic orientation of individual grains influences the crack initiation and crack growth mechanisms. Grain boundaries are classified into high- and low-angle grain boundaries dependent on the orientation relationship of two neighbouring grains. During cyclic loading intergranular and transgranular cracks preferentially initiate at grain boundaries with highmisorientation angles because of stresses due to elastic anisotropy. Furthermore low- and high-angle grain boundaries influence the short fatigue crack growth behaviour, increase and decrease of crack propagation rate respectively, in different way.
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