A high strength Ni-based bulk amorphous alloy is synthesized by warm extrusion of gas atomized amorphous powder. The Ni59Zr20Ti16Si2Sn3 amorphous powder obtained by a high pressure Ar gas atomization method has a wide super-cooled liquid region of 63 K. Warm extrusion of the amorphous powders in the super-cooled liquid state successfully yielded a fully consolidated bulk amorphous Ni59Zr20Ti16Si2Sn3 alloy. The processing conditions for extrusion are obtained from the time-temperature-transformation curve for the onset of crystallization of the amorphous powder. Lower extrusion ratio of 5 is preferred for the retention of the single amorphous phase during extrusion at 848 K. The extruded bulk amorphous Ni59Zr20Ti16Si2Sn3 alloy exhibits a high strength level (∼2.0 GPa) similar to that of an as-cast bulk amorphous Ni59Zr20Ti16Si2Sn3 alloy (∼2.2 GPa). The mechanical behavior of the extruded alloy under the compressive condition shows no anisotropy in the longitudinal and transverse directions to the extrusion direction.
Bibliographical noteFunding Information:
The work performed at Center for Non-crystalline Materials, Yonsei University was supported by the Creative Research Initiatives of the Korean Ministry of Science and Technology. M.H.L. is grateful for the support from the Brain Korea 21 project. The work performed at Ames Laboratory was supported by USDOE, Office of Basic Energy Sciences, Division of Materials Science under contract no. W-7405-ENG-82.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Materials Chemistry