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 language | English |
|---|---|
| Pages (from-to) | 1202-1206 |
| Number of pages | 5 |
| Journal | Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy |
| Volume | 45 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 1998 Dec |
Keywords
- 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