The characteristics of Cu–12 wt.% Ag filamentary microcomposite in different isothermal process
✍ Scribed by J.B. Liu; L. Meng
- Publisher
- Elsevier Science
- Year
- 2006
- Tongue
- English
- Weight
- 630 KB
- Volume
- 418
- Category
- Article
- ISSN
- 0921-5093
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✦ Synopsis
The Cu-12 wt.% Ag microcomposite with a filamentary structure of double phases was prepared by heavy cold drawing and intermediate heat treatments. The influence of isothermal processes on the microstructure and properties was investigated by annealing the microcomposite at various temperatures for different time. The strength slightly decreases and the conductivity slightly increases but the filamentary morphology is still kept during the isothermal treatment at 200 • C. The hardness decreases in initial isothermal period and then increases with prolonging isothermal time. The decrease in strength and the increase in conductivity are more significant during the isothermal treatment at 300 • C than at 200 • C because the filamentary structure evolved from eutectic colonies coarsens and changes into crystallite clusters in long isothermal period. Recrystallizing presented in initial isothermal period at 400 • C converts the filamentary phases into small equiaxial grains and results in the great decrease in strength and the quick increase in conductivity. Significant propagation of recrystallized grains at 400 • C with prolonging isothermal time results in gradual disappearance of the filamentary morphology. However, the strength reduction becomes slow and the conductivity also decreases after a maximum value is reached.