POLYMORPHISM OF FE-NI AND FE-MN NANOSTRUCTURED ALLOYS SUBJECTED TO PRESSURE SHEAR

The phase transformations [BCC]-[HCP], [BCC]-[FCC], [FCC]-[HCP] caused by deformation and high pressure in stable iron-based alloys: iron, F e-Ni alloys N6, N23, N27, and Fe-Mn alloy G40 were studied The nuclear gamma resonance [NGR] technique was used to examine samples subjected to high pressure and deformation shear in situ. The phase transformat ions studied on pressure shear in situ are accompanied by a large decr ease in grain dimensions and a rise of local stresses, which are respo nsible for the observed changes in the polymorphism of Fe-Ni and Fe-Mn alloys and formation of new structural stales: a epsilon sextet with a broad distribution of [NGR] parameters in iron (or intercrystalline structure), a epsilon Singlet in the [FCC] Gadfield steel ([SF] clus ters), etc.