Transformational Superplasticity of Bi ₂ WO ₆ and Bi ₂ MoO ₆

Abstract

Transformational Superplasticity was studied in the compounds Bi 2 WO 6 and Bi 2 MoO 6 . The magnitudes of transitional strain are related to the ( T t /T mP ), s of the phase transitions and are proportional to the externally applied stresses. Strain‐rate sensitivities were similar, 0.85 and 0.86; however, the Bi 2 WO 6 exhibited a strain‐axis intercept and the Bi 2 MoO 6 a stress‐axis intercept. The grain‐size effect present in the Bi 2 WO 6 supports an accommodated grain‐boundary sliding mechanism for the superplastic deformation process.