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Precipitation; Vegard’s law; copper alloys; grain boundary migration.

Discontinuous precipitation (DP) is associated with grain boundary migration in the wake of which alternate plates of the precipitate and the depleted matrix form. Some copper base alloys show DP while others do not. In this paper the misfit strain parameter, 𝜂, has been calculated and predicted that if 100 𝜂 > ± 0.1, DP is observed. This criterion points to diffusional coherency strain theory to be the operative mechanism for DP.

K T Kashyap¹

1. Department of Mechanical Engineering, PES Institute of Technology, Bangalore 560 085, India

Manuscript received

12 June 2008

Manuscript revised

4 August 2009