|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Nanocomposites V: Structure-Property Relationships in Nanostructured Materials
||Size Effect in Ti-Fe-(Sn) Ultrafine Lamellar Eutectic Composites during Micro/-nano-indentation
||Tapabrata Maity, Jürgen Eckert
|On-Site Speaker (Planned)
ISE has been studied in series of Ti-Fe-(Sn) ultrafine eutectic lamellar composites (UECs) by micro-/nanoindentation in wide depth range. The UECs are comprised of ultrafine FeTi and β–Ti lamellae phases with different lamellae thickness. Indentation studies revealed that dislocation based plasticity persists in such UECs. It has been shown that severe forging (SF) assisted on the formation of new lamellae interfaces due to their fragmentation, localized reorientation and phase rearrangement. Presence of large fraction of lamellae interface assist the evolution of high GND density of 10^15/m2 and hardness 16 GPa, which further increases upto 10^16 /m2 and 22 GPa, upon SF.
A micromechanical model showing that high density GNDs generated at small indentation depths shifts away from the plastic zone underneath Berkovich indenter for microcrystalline specimens, can easily be able to accommodate in the SF UECs and thus give rise to exceptionally excessive hardness as far as 22 GPa.
||Planned: Supplemental Proceedings volume