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

Cheng Zhou, Tatsuhiko Aizawa, Kiyohiko Tatsuzawa

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


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
Issue number12
Publication statusPublished - 1998 Dec


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

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry


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