In order to investigate Hafnium transition metal alloys HfM (M= Co, Ir, Os,Pt, Rh, Ru)
phase diagrams in the region of 50/50% atomic ratio, we performed ab initio Full-Potential
Linearized Augmented Plane Waves calculations of the enthalpies of formation of HfM compounds
at B2 (CsCl) structure type. The obtained enthalpies of formation are discussed and compared to
some of the existing models and available experimental data.