Hidden Effects of Negative Stacking Fault Energies in Complex Concentrated Alloys

Calculated stacking-fault energies of elemental metals.

Stacking Fault Energies of Tetrahedrally Coordinated Crystals

The energies of the intrinsic stacking fault in 20 tetrahedrally coordinated crystals, determined by electron microscopy from the widths of extended dislocations, range from a few mJ/m to 300 mJ/m. The reduced stacking fault energy (RSFE: stacking fault energy per bond perpendicular to the fault plane) has been found to have correlations with the effective charge, the charge redistribution inde...

Simple model of stacking-fault energies.

Stacking - fault energies in simple metals : applications to BCC metals

We present a general method for calculating the stacking-fault energy in simple metals, and then we apply this to the ( 1 1 2 ) faults in body-centred cubic (BCC) metals. Our method contains no approximations for a given wavenumber characteristic (or equivalently the pair potential). Our results show that metastable faults do indeed exist in the simple BCC metals (Li, Na. K, Rb, Cs, Ca. Sr, Ba)...

Hidden negative energies in strongly accelerated universes

where u is the velocity of an observer while "u is the energy density and P is the pressure measured by the observer and we use the (þ ) convention for the metric. The equation-of-state parameter is then defined as w P="u. In cosmological setups, one then considers homogeneous and isotropic Friedmann universes. In such a case, even for more general, imperfect-fluid DE models, the configuration ...