|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Mechanical Behavior of Nanostructured Materials
||L-153: The Influence of Severe Plastic Deformation on the Fatigue Crack Growth Behavior of Pure Metals and Alloys
||Thomas Leitner, Anton Hohenwarter, Reinhard Pippan
|On-Site Speaker (Planned)
Ultrafine-grained (UFG) and nanocrystalline (NC) metals exhibit exceptional strength under monotonic and cyclic loading and are therefore interesting materials for many engineering applications. However, beside strength also damage tolerance has to be considered in order to guarantee the safety of components made of UFG metals. Therefore fatigue crack growth (FCG) experiments were performed on pure nickel, ARMCO iron, austenitic steel, fully pearlitic steel and a NiTi alloy, which were severely plastically deformed to obtain UFG microstructures. In general, deteriorated FCG resistance is observed in the near-threshold region for nanostructured metals, compared to their coarser-grained counterparts. However, at higher stress intensity factor ranges UFG and NC samples can exhibit comparable or even slower crack propagation. The results are discussed with focus on the microscopic FCG mechanisms and the contributions from extrinsic and intrinsic toughening.
||Planned: Supplemental Proceedings volume