Abstract
The intergranular stress was investigated at grain boundaries (GBs) of Ti-2Al-2.5Zr alloy under cyclic loading. The crystal plasticity (CP) simulations revealed that the strain incompatibility between soft-soft grains due to shear direction difference, which forced the slight activation of tension twins (TT) near GBs. Twin boundaries (TBs) and GBs constituted new triple junctions, leading to further stress concentration and fatigue damage initiation. While the strain quantity difference at soft-hard GBs induced the moderate stress jump and stable stress evolution, which was insufficient to generate fatigue cracks. The EBSD-based CP model successfully predicted the twin activation and fatigue cracks at GBs.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
