Nearly complete strain-induced phase transformation in cold-rolled pure cobalt
Résumé
The aim of this study is to investigate the effect of high strain levels, achieved through cold rolling, on the straininduced phase transformation in cobalt, from the Face-Centred Cubic (FCC) phase to the Hexagonal Close-Packed (HCP) one. The samples were cold-rolled at various reduction ratios and their surfaces were analysed using Electron BackScattered Diffraction (EBSD), which provides miscellaneous valuable information such as phase ratio and crystallographic texture. Results show that approximately 87 % of the initial FCC phase is converted to HCP phase under 71 % of von Mises equivalent plastic strain. A linear decrease of the FCC phase fraction as a function of the logarithm of equivalent strain was observed. Furthermore, an evolution of the basal {0001}HCP pole figure at different strains was remarked, tending toward a typical cold-rolled texture for the highest strain.
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