|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Ultrafine-grained Materials X
||Investigation of Fatigue Micro-mechanisms in Ultrafine Grained CoCrxNi Medium Entropy Alloy
||Shivakant Shukla, Mageshwari Komarasamy, Kaimiao Liu, Rajiv S Mishra
|On-Site Speaker (Planned)
The aim of this study is to understand the micro-mechanisms involved in cyclic loading condition of an ultrafine-grained (UFG) CoCrxNi medium entropy alloy (MEA). Since it is known that MEAs possess a high fraction of twin boundaries, an effort has been made to understand the effect of twin boundaries on crack nucleation and subsequent growth under cyclic loading. The UFG microstructure was obtained via cold rolling followed by annealing. Orientation image microscopy (OIM) and transmission electron microscopy (TEM) were employed to investigate the grain size distribution and misorientation angle information of the sample before and after the fatigue test. No stress induced grain coarsening was observed and UFG microstructure was stable. The possibility of fatigue induced shear band formation and propagation were analyzed using OIM. S-N curve was generated to understand the overall fatigue life at various stresses.
||Planned: Supplemental Proceedings volume