|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Bulk Processing of Nanostructured Powders and Nanopowders by Consolidation
||Achieving Good Mechanical Properties and High Thermal Stability with Ultrafine Grained Cu-5at%Zr Alloy Synthesized by High Energy Mechanical Milling and Spark Plasma Sintering
||Wei Zeng, Dengshan Zhou, Deliang Zhang
|On-Site Speaker (Planned)
Fully dense ultrafine grained Cu-5at%Zr alloy was synthesized through high energy mechanical milling combined with spark plasma sintering. The alloy exhibits a tensile yield stress (YS) of 373MPa, ultimate tensile strength (UTS) of 505PMa and elongation to fracture of ~5%. The copper grain sizes ranged from 100 to 500nm, and the microstructure contains Zr(C,O) nanoparticles of 10~20nm in diameter which are distributed inside copper grains and impede dislocation movement inducing significant strain hardening. The considerable tensile ductility is ascribed to the full density of the material eliminating most of the nano poles and the significant strain hardening hindering strain instability. The thermal stability of the material is so high that softening is not observed after heat treatment under 1000℃ for 50h, the excellent thermal stability is likely due to the pinning effect of Zr(C,O) nanoparticles and segregation of Zr atoms into grain boundaries.
||Planned: A print-only volume