Abstract
The compressive behavior and sintering condition of Ni-based metallic glass sintered body produced by precise hot pressing was investigated in this study. Ni-based metallic glass powder prepared by a gas atomizing process was sintered under the condition of processing temperature 863 K, processing pressure 200 MPa, which enabled to achieve sintered bodies of nearly full densification without crystallization. These processing condition were found in previous study using precise hot pressing.
The compression test was conducted using amorphous sintered body described above. The compressive strength, Young's modulus, and elastic elongation are 1929 MPa, 94.8 GPa, and 0.021, respectively. The amorphous sintered body has high strength and lower Young's modulus than crystalline metals. These compressive characteristics are the same as bulk metallic glass manufactured by casting. Sintering condition of Ni-based metallic glass sintered body was observed using transmission electron microscope. While the contrast was observed in metallic glass powder boundaries, oxides, micro pores, and crystals weren't found, which demonstrated excellent sintering properties obtained by the diffusion mechanism.
In addition, the gear-shaped sintered amorphous body was successfully manufactured, showing great potential for various applications in manufacturing.
