|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Ultrafine Grained Materials IX
||Hardening by Annealing in Nanocrystalline Metals
||Oliver Renk, Anton Hohenwarter, Reinhard Pippan
|On-Site Speaker (Planned)
In comparison to coarse grained materials nanocrystalline metals can show pronounced hardening during annealing at temperatures where no significant grain growth occurs. These phenomena can be attributed to the first stages of recovery in nanocrystalline materials. Although known for several years the origin of this unexpected hardening is still controversially discussed. Solute segregation to grain boundaries and dislocation source hardening has been proposed to cause the strengthening effect. An in depth study on selected binary alloys was carried out to gain deeper insights into the occurring hardening mechanisms. It will be shown, that hardening upon annealing can only be observed if the grain size is well below a material specific threshold value and is a clearly grain size dependent phenomena. The reasons for such a distinct transition in the annealing behaviour will be the centre of discussion.