Mechanical properties and electronic structure of MgCu2, Mg2 Ca and MgZn2 phases were investigated by means of first principles calculations from CASTEP program based on density functional theory（DFT）. The calculate...Mechanical properties and electronic structure of MgCu2, Mg2 Ca and MgZn2 phases were investigated by means of first principles calculations from CASTEP program based on density functional theory（DFT）. The calculated lattice parameters are in good agreement with the experimental and literature values. The calculated heat of formation and cohesive energies showed that MgCu2 has the strongest alloying ability and structural stability. Elastic constants of MgCu2, Mg2 Ca and MgZn2 were calculated, and the bulk moduli, shear moduli, elastic moduli and Poisson ratio were derived. The calculated results show that MgCu2, Mg2 Ca and MgZn2 are all ductile phases. Among the three phases, MgCu2 has the strongest stiffness and the plasticity of MgZn2 phase is the best. Melting points of the three phases were predicted using cohesive energy and elastic constants. Density of states（DOS）, Mulliken population, electron occupation number and charge density difference were discussed. Finally, Debye temperature was calculated and discussed.展开更多
The properties of MgCu2and Mg2Si phases were discussed by the first-principle calculations,which include electronicstructure,structural stability and elastic properties.The calculated structural parameters tally with ...The properties of MgCu2and Mg2Si phases were discussed by the first-principle calculations,which include electronicstructure,structural stability and elastic properties.The calculated structural parameters tally with experimental and previoustheoretical data.The results of formation heat and cohesive energy indicate that MgCu2has stronger structural stability andMg2Si has stronger alloying ability.The calculated results of shear modulus G,bulk modulus B and Young^modulus E indicatethat MgCu2is ductile material and Mg2Si is brittle material with larger stiffness.The calculation results of density of state(DOS)and population analysis show that the Mg〗Si has stronger ionic bond.展开更多
基金Project(2013201018)supported by Scientific and Technological Project of Liaoning Province,China
文摘Mechanical properties and electronic structure of MgCu2, Mg2 Ca and MgZn2 phases were investigated by means of first principles calculations from CASTEP program based on density functional theory（DFT）. The calculated lattice parameters are in good agreement with the experimental and literature values. The calculated heat of formation and cohesive energies showed that MgCu2 has the strongest alloying ability and structural stability. Elastic constants of MgCu2, Mg2 Ca and MgZn2 were calculated, and the bulk moduli, shear moduli, elastic moduli and Poisson ratio were derived. The calculated results show that MgCu2, Mg2 Ca and MgZn2 are all ductile phases. Among the three phases, MgCu2 has the strongest stiffness and the plasticity of MgZn2 phase is the best. Melting points of the three phases were predicted using cohesive energy and elastic constants. Density of states（DOS）, Mulliken population, electron occupation number and charge density difference were discussed. Finally, Debye temperature was calculated and discussed.
基金National Natural Science Foundation of China(Nos.U1610123,51674226,51574207,51574206,51274175)International Cooperation Project of the Ministry of Science and Technology of China(No.2014DFA50320)+3 种基金Science and Technology Major Project of Shanxi Province(No.MC2016-06)International Science and Technology Cooperation Project of Shanxi Province(No.2015081041)Research Project Supported by Shanxi Scholarship Council of China.(No.2016-Key 2Transformation of Scientific and Technological Achievements Special Guide Project of Shanxi Province(No.201604D131029)
文摘The properties of MgCu2and Mg2Si phases were discussed by the first-principle calculations,which include electronicstructure,structural stability and elastic properties.The calculated structural parameters tally with experimental and previoustheoretical data.The results of formation heat and cohesive energy indicate that MgCu2has stronger structural stability andMg2Si has stronger alloying ability.The calculated results of shear modulus G,bulk modulus B and Young^modulus E indicatethat MgCu2is ductile material and Mg2Si is brittle material with larger stiffness.The calculation results of density of state(DOS)and population analysis show that the Mg〗Si has stronger ionic bond.
