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The first-principle method based on the density function theory was used to investigate the formation energy,the migration barrier energy of first nearest neighbor(1NN)and second nearest neighbor(2NN)in tungsten system doped with solute atom rhenium or tantalum.The results presented the mono-vacancy formation energies were highly sensitive to the alloy composition.Solute atoms Re and Ta made a positive role to produce the mono-vacancy.In addition,the migration barrier energy of W-Re and W-Ta system is 1.61eV and 1.46eV,which is lower than that of pure tungsten.The calculation indicated that the transmutation elements Re and Ta had promoted the process of migration of the point defects in Bcc tungsten.