|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Solid State Precipitation
||Hydride Precipitates in Zirconium Alloys: Evolution of Dissolution and Precipitation Temperatures during Thermal Cycling Correlated to Microstructure Features
||Egle Conforto, Stephane Cohendoz, Patrick Girault, Cyril Berziou, Xavier Feaugas
|On-Site Speaker (Planned)
The fast and spontaneous hydrogen diffusion in zirconium alloys used in nuclear industry leads to the hydride precipitation which is often pointed as causing embrittlement and rupture. Our studies using XDR, TEM and SEM-EBSD have been demonstrating that the nature of the hydride phase precipitated depends on the hydrogen content and can show crystallographic orientation relationships (ORs) with the substrate. DSC has been used to identify the dissolution and precipitation energies at global scale. The difference of both can be associated to the misfit dislocation contribution to the precipitation. Local TEM “in-situ” dissolution observations confirm the dissolution temperature identified at global scale and demonstrate the fact that part of misfit dislocations can be depinning during dissolution process. The consequence of this mechanism is that dissolution and precipitation temperatures shift during thermal cyclic loading. This situation will be correlated to the nature of crystallographic hydride phases and their ORs.
||Planned: Supplemental Proceedings volume