[2B05-09] Advanced Fusion Material Technology

11:05 AM - 11:20 AM JST(2:05 AM - 2:20 AM UTC)

[2B07] Mechanical properties and Microstructure of Gas-atomized Cu-Y-Zr and WO₃ ODS-Cu towards the Overcoming of Trade-off between Strength and Conductivity

*Zimo Gao¹, Hao YU¹, Ryuta Kasada¹ (1. Tohoku Univ.)

Keywords:

ODS-Cu,Mechanical alloying

Copper alloys has been widely used as heat sink materials due to the excellent thermal conductivity. Oxide dispersion strengthened alloys has been proved to dramatically enhance the mechanical properties and irradiation resistance by the dispersed oxide particles However, coarsening of powder and inhomogeneous distribution of oxide limited the further application of Zr-added ODS-Cu. This research is to fabricate the oxide dispersion strengthened copper alloy by mechanical alloying with gas-atomized Cu-Y-Zr powder and WO₃ powder.As a result, WO₃ addition effectively enhance the efficiency of mechanical alloying, which achieved almost 100% production rate for MAed powder after filtered by mesh of 525μm. After sintering, the Cu-Y-Zr-2.5wt%WO₃ achieved 270HV and 70mm²/s on thermal diffusivity. X-ray diffraction results indicated that WO₃ decompose in MA process, which provided free oxygen for Y or Zr and existed as pure tungsten in the as-sintered sample.