| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
Microstructure-interacting Short Crack Growth in Blocky Alpha Zircaloy-4 |
| Author(s) |
Weifeng Wan, Fionn Dunne |
| On-Site Speaker (Planned) |
Weifeng Wan |
| Abstract Scope |
Microstructurally short fatigue crack growth in blocky alpha Zircaloy-4 is experimentally investigated in cyclic three-point bend testing. The short crack propagation is sensitive to the local microstructure with respect to grain crystallographic orientation and grain boundaries. Polcrystals with predominant c-axis texture aligned out-of-plane and normal to loading give alternating crack paths along prismatic planes. Samples with c-axis texture aligned in plane and normal to loading typically show straight paths along prismatic planes, sometimes tortuous paths, but always crystallographic. Prismatic <a>-direction crack growth rate is low (0.077 μm/cycle) compared to that for prismatic <c>-direction growth (0.458 μm/cycle) for given loading. Hence the crystallographic plane within which cracks grow is important for growth rate. For the tortuous cracks, with the predominant c-axis texture in plane and normal to loading, crack growth occurs along basal, prismatic and pyramidal planes, deflecting from one slip plane to another during transgranular propagation. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |