Synthesis of Ni-based bulk amorphous alloys by warm extrusion of amorphous powders

M. H. Lee, DongHyun Bae, W. T. Kim, Do Hyang Kim, E. Rozhkova, P. B. Wheelock, D. J. Sordelet

Research output: Contribution to journalArticle

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Abstract

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.

Original languageEnglish
Pages (from-to)89-96
Number of pages8
JournalJournal of Non-Crystalline Solids
Volume315
Issue number1-2
DOIs
Publication statusPublished - 2003 Jan 1

Fingerprint

Amorphous alloys
Powders
Extrusion
synthesis
high strength
gas atomization
Gases
liquids
Liquids
Atomization
casts
Crystallization
crystallization
Anisotropy
anisotropy
curves
gases
Processing
temperature

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

Cite this

Lee, M. H. ; Bae, DongHyun ; Kim, W. T. ; Kim, Do Hyang ; Rozhkova, E. ; Wheelock, P. B. ; Sordelet, D. J. / Synthesis of Ni-based bulk amorphous alloys by warm extrusion of amorphous powders. In: Journal of Non-Crystalline Solids. 2003 ; Vol. 315, No. 1-2. pp. 89-96.
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Synthesis of Ni-based bulk amorphous alloys by warm extrusion of amorphous powders. / Lee, M. H.; Bae, DongHyun; Kim, W. T.; Kim, Do Hyang; Rozhkova, E.; Wheelock, P. B.; Sordelet, D. J.

In: Journal of Non-Crystalline Solids, Vol. 315, No. 1-2, 01.01.2003, p. 89-96.

Research output: Contribution to journalArticle

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AU - Lee, M. H.

AU - Bae, DongHyun

AU - Kim, W. T.

AU - Kim, Do Hyang

AU - Rozhkova, E.

AU - Wheelock, P. B.

AU - Sordelet, D. J.

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N2 - 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.

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