A simple modified analytic EAM model for bcc Fe and fcc Al was used to calculate the lattice constant and elastic constants of B2 FeAl and DO3 Fe3Al alloys. The formation energies of ...A simple modified analytic EAM model for bcc Fe and fcc Al was used to calculate the lattice constant and elastic constants of B2 FeAl and DO3 Fe3Al alloys. The formation energies of vacancy and antisite were also calculated. The present calculations are in agreement with the experimental data and the theoretical results obtained by other authors.展开更多
The interfacial defects of hard magnetic Pr2Fe14B phase from amorphous t o nanostructures have been investigated by positron lifetime spectroscopy. The n anostructure was produced by melt-spinning and nanocrystallizat...The interfacial defects of hard magnetic Pr2Fe14B phase from amorphous t o nanostructures have been investigated by positron lifetime spectroscopy. The n anostructure was produced by melt-spinning and nanocrystallization route. The t wo main components can be ascribed to vacancy-like defects in the intergranular layers or the interfaces,and microvoids or large free volumes with size compar ed to several missing atoms at the interactions of the （atomic） aggregates or the crystallites. The remarkable changes in the positron lifetimes from the amor phous structure to the nanocrystructure with varied sizes can be interpreted,in dicating that the structural transformation and the grain growth induce the defe ct changes occurring at the interfaces with different shapes and sizes.展开更多
文摘A simple modified analytic EAM model for bcc Fe and fcc Al was used to calculate the lattice constant and elastic constants of B2 FeAl and DO3 Fe3Al alloys. The formation energies of vacancy and antisite were also calculated. The present calculations are in agreement with the experimental data and the theoretical results obtained by other authors.
文摘The interfacial defects of hard magnetic Pr2Fe14B phase from amorphous t o nanostructures have been investigated by positron lifetime spectroscopy. The n anostructure was produced by melt-spinning and nanocrystallization route. The t wo main components can be ascribed to vacancy-like defects in the intergranular layers or the interfaces,and microvoids or large free volumes with size compar ed to several missing atoms at the interactions of the （atomic） aggregates or the crystallites. The remarkable changes in the positron lifetimes from the amor phous structure to the nanocrystructure with varied sizes can be interpreted,in dicating that the structural transformation and the grain growth induce the defe ct changes occurring at the interfaces with different shapes and sizes.
