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Journal of Materials Science

, Volume 28, Issue 19, pp 5275–5279 | Cite as

Processing maps for hot working of Cu-Ni-Zn alloys

Part II α-β nickel silver
  • D. Padmavardhani
  • Y. V. R. K. Prasad
Papers

Abstract

The constitutive behaviour of α-β nickel silver in the temperature range 600–850 °C and strainrate range 0.001–100s−1 was characterized with the help of a processing map generated on the principles of the dynamic materials model. On the basis of the flow-stress data, processing maps showing the variation of the efficiency of power dissipation (given by [2m/(m+1)], wherem is the strain-rate sensitivity) with temperature and strain rate were obtained, α-β nickel silver exhibits a single domain at temperatures greater than 700 °C and at strain rates lower than 1 s−1 with a maximum efficiency of power dissipation of about 42% occurring at about 850 °C and at 0.1 s−1. In the domain, the α phase undergoes dynamic recrystallization and controls the deformation of the alloy, while the β phase deforms superplastically. Optimum conditions for the processing of α-β nickel silver are 850 °C and 0.1 s−1. The material undergoes unstable flow at strain rates of 10 and 100 s−1 and in the temperature range 600–750 °C, manifestated in the form of adiabatic shear bands.

Keywords

Nickel Recrystallization Shear Band Material Model Power Dissipation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1993

Authors and Affiliations

  • D. Padmavardhani
    • 1
  • Y. V. R. K. Prasad
    • 1
  1. 1.Department of MetallurgyIndian Institute of ScienceBangaloreIndia

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