Plasmon energy losses in shear bands of metallic glass

Shear bands resulting from plastic deformation in cold-rolled Al88Y7Fe5 metallic glass were observed to display alternating density changes along their propagation direction. Electron-energy loss spectroscopy (EELS) was used investigate the volume plasmon energy losses and around shear bands. Energy shifts of peak centre width (FWHM) reflecting damping precisely determined within an accuracy a few meV using open source python module (Hyperspy) fit shapes zero-loss peaks with Lorentzian functions. The maximum bulk calculated for bright dark band segments relative matrix be about 38 14 meV, respectively. larger denser regions. analysis presented here suggests that plasmons are caused by two contributions: (i) Variable due medium-range order (MRO). This affects static structure factor S(k), which, turn, leads either reduced or increased according Ziman–Baym formula. (ii) ionic effective electron mass appearing zero-momentum frequency formula Ep(q=0) coupled give rise small variations energy. model predicts meV.