|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Mechanical Behavior of Nanostructured Materials
||Suppressing Oxide Nanoparticle Coarsening and Cu Nanograin Growth in Nanostructured Cu Matrix Nanocomposites by Adding Ti
||Dengshan Zhou, Wei Zeng, Charlie Kong, Paul Munroe, Deliang Zhang
|On-Site Speaker (Planned)
Suppressing oxide nanoparticle coarsening during powder consolidation is crucial for fabricating bulk nanostructured metal matrix nanocomposites with excellent mechanical and physical properties via powder metallurgy routes. It has shown that alloying element can significantly improve the thermal stability of oxide nanoparticles in oxide dispersion-strengthened (ODS) metals, so we investigated the effectiveness of minor Ti addition on the suppression of Al2O3/Y2O3 nanoparticle coarsening and Cu nanograin growth during annealing mechanically milled nanostructured Cu-5vol.%Al2O3/Y2O3 nanocomposite powder particles. For the milled powder sample annealed at 700oC or 900oC for 1 hour, energy dispersive spectrometry (EDS) analysis revealed that the doped Ti atoms diffused into the Al2O3 or Y2O3 nanoparticles to form Ti-containing nanoparticles, which are more stable than those corresponding Ti-free nanoparticles. Such thermally stable Ti-rich complex nanoparticles effectively retarded the migration of Cu grain boundaries during annealing, inhibiting the growth of Cu nanograins.
||Planned: Supplemental Proceedings volume