The energetics and electronic structures of W doped γ-Co/γ′-Co

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Al interface region model were calculated by the first principles method based on plane-wave pseudopotential theory. The results demonstrate that the substitution of W atom for Al atom sited in γ-Co/γ′-Co

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Al interfaces can improve the rupture strength of the γ-Co/γ′-Co

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Al interface. However

the substitution of W atom for Al or Co atom in other place has little effect on the rupture strength of the phase boundary region. The analysis of electron densities of states（DOS） and the distributions of valence electron densities of γ-Co/γ′-Co

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Al interface indicate that the doping of W leads to the strong electron interaction between W and its nearest neighbor Co atoms

resulting in the enhancement of the interlayer atomic bonding interaction in the phase boundary region

which is the direct reason for the enhancement of the rupture strength of γ-Co/γ′-Co

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Al phase boundary.