Nano-structure of Bulk Nano-granular Material in Cu/Co System

Cheng Zhou, Tatsuhiko Aizawa, Kiyohiko Tatsuzawa

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Nano-granulation process of Cu/Co system is investigated on the route of bulk mechanical alloying. Using the bulk mechanical alloying, the super-saturated solid solution of Cu-20mol%Co has been prepared. Through the further heat treatment, the Co nano-precipitated from the super-saturated solid solution in the copper matrix, resulting in appearance of the giant magneto-resistance. In the present study, the nano-precipitation of Co and the Co-particulate size is investigated by XRD, VSM and TEM. The relationship between the magneto-resistance ratio and the nano-precipitation process of Co is investigated. This relation depends on both the nucleation rate of Co-cluster precipitate and the growth rate of Co-cluster. The change of the magneto-resistance ratio with the Co-cluster size is also obtained: Co precipitate size must be 1∼3 nm to attain higher magneto-resistance ratio than 10%.

Original languageEnglish
Pages (from-to)1202-1206
Number of pages5
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume45
Issue number12
Publication statusPublished - 1998 Dec
Externally publishedYes

Fingerprint

Granular materials
Magnetoresistance
Mechanical alloying
Precipitates
Solid solutions
Giant magnetoresistance
Granulation
Copper
Nucleation
Heat treatment
Transmission electron microscopy

Keywords

  • Bulk mechanical alloying
  • Cu/Co
  • Giant magneto-resistance
  • Nano-granulation

ASJC Scopus subject areas

  • Mechanical Engineering
  • Metals and Alloys

Cite this

Nano-structure of Bulk Nano-granular Material in Cu/Co System. / Zhou, Cheng; Aizawa, Tatsuhiko; Tatsuzawa, Kiyohiko.

In: Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy, Vol. 45, No. 12, 12.1998, p. 1202-1206.

Research output: Contribution to journalArticle

Zhou, Cheng ; Aizawa, Tatsuhiko ; Tatsuzawa, Kiyohiko. / Nano-structure of Bulk Nano-granular Material in Cu/Co System. In: Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy. 1998 ; Vol. 45, No. 12. pp. 1202-1206.
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