|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Powder Metallurgy of Light, Reactive and Other Non-ferrous Metals
||Microstructure of Y2O3 Stabilized UFG CP Ti Prepared by Cryomilling and Spark Plasma Sintering
||Jiří Kozlík, Josef Stráský, Petr Harcuba, Miloš Janeček
|On-Site Speaker (Planned)
Titanium is a promising material in many applications. Further enhancement of mechanical properties can be achieved via grain refinement. One of the limiting problems is the insufficient stability of the fine-grained structure when exposed to high temperatures, which can be improved by addition of ceramic particles.
The material was produced by powder metallurgy using high energy ball milling in liquid argon and spark plasma sintering. The aim is to investigate the influence of ceramic particles on microstructure, microstructural stability and mechanical properties of the material.
Homogeneous distribution of Y<sub>2</sub>O<sub>3</sub> nanoparticles was achieved by ball milling. The reinforced UFG Ti is stable up to 850 °C (needed to obtain fully dense sample by SPS) thanks to the grain boundary pinning by ceramic particles. The microhardness is increased because of the Orowan strengthening by Y<sub>2</sub>O<sub>3</sub>. Grain growth is significantly suppressed during annealing when compared to the plain CP Ti.
||Planned: Supplemental Proceedings volume