|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Mechanical Behavior of Nanostructured Materials
||L-121: Cyclic Response of Friction-stir Processed Ultra-fine Grained Copper
||Salar Salahi, G. Guven Yapici
|On-Site Speaker (Planned)
Friction processing has become a viable method of refinement down to ultra-fine and nanostructured regime, especially in the stir zone. It is also possible to obtain sound joints of similar and dis-similar materials with this technique. Reliable utilization of friction stir welded joints with ultra-fine grained microstructure requires attention on the fatigue behavior as well. In this work, cyclic response of pure copper at different joint zones was investigated. Fatigue properties were demonstrated with the S-N curves developed under positive mean stress. Fatigue properties were specified at a strain ratio of 0.1 with total strain amplitudes up to 0.2%. The results demonstrated cyclic hardening at high strain amplitudes, while softening was observed at low strain amplitude of 0.01%. The hysteresis loops indicated the concavity along with the small portion of linear behavior after the reversal point. Fatigue properties at various conditions were discussed in light of the respective failure mechanisms.
||Planned: Supplemental Proceedings volume