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Quantitative assessment of strain and heat treatment on twin formation in commercially pure nickel

Thermomechanical treatment comprising cold working to 6% strain followed by annealing at temperatures in the range 700 o C to 1000 o C greatly increases the fraction of special boundaries, primarily Σ3 type. The accompanying generation of annealing twins is analysed using the accident growth model due to Gleiter and the phenomenological model of Pande et al. It is shown that Gleiter’s model, which contains no scaling factors, when used correctly, predicts the twin density in Cu alloys and pure nickel. The model due to Pande et al also predicts the twin density in Ni but this model incorporates two scaling factors that detract from its generality.