Structural disorder, phase stability and compressibility of refractory body-centered cubic solid-solution alloys

The Debye-Waller factors of refractory bcc solid-solution alloys TiVNbTa and TiVNbMoTa measured by low temperature neutron diffraction are obviously larger than that of the face-centered cubic (fcc) solid-solution alloy NiCoFeCrMn. The bcc lattice of the studied solid-solution alloys is stable up to similar to 50 GPa, but a structural distortion is clearly observed at pressures higher than similar to 20 GPa. The bulk modulus of bcc high entropy alloys (HEAs) is closely relevant to both the size mismatch in the lattice and the number of elements in the systems. (C) 2020 Published by Elsevier B.V.