The bonding characteristics of (0001)α2||(111)γ interface in two-phase TiAl alloy have beeninvestigated with the recursion method. The results of bond order integral and interaction energybetween atoms are presented...The bonding characteristics of (0001)α2||(111)γ interface in two-phase TiAl alloy have beeninvestigated with the recursion method. The results of bond order integral and interaction energybetween atoms are presented. The effects of B on atoms bonding both in constituent phase andat the α2/γ interface have been studied. The correlation between the mechanical propertiesof the alloy and the bonding at the interface has been discussed. The results suggest that Bsegregation to the interface benefits the ductility. This is supported by the related experiment.展开更多
Al_2O_3 and 3% (mole fraction) yttrium tetragonal zirconia was joined together by a process of directly joining their green body in plastic state and following co-sintering. Joining strength, joint microstructure, str...Al_2O_3 and 3% (mole fraction) yttrium tetragonal zirconia was joined together by a process of directly joining their green body in plastic state and following co-sintering. Joining strength, joint microstructure, stress state of joining interface, and diffusion between joined compositions were studied. Experimental results show that a transition interlayer containing both joined particles is formed in the joint which is dense and pore free, fracture taken place at Al_2O_3 matrix near the joining interface but the joining strength is lower than normal Al_2O_3 matrix because of the complex stress state near the interface. Apart from the effect of plasticity of green bulk on joining before sintering, it is postulated from the HRTEM/EDS studied results that the diffusion of Al 3+ to the ZrO_2 grain during the sintering process contributed to the interface bonding which led a success joining of Al_2O_3 and ZrO_2 composites.展开更多
The ion transfer of the basic dye rhodamine B at the interface between water and nitro- benzene,water and 1,2-dichloroethane,as well as water and nitrobenzene-chlorobenzene mixtures has been studied by cyclic voltamme...The ion transfer of the basic dye rhodamine B at the interface between water and nitro- benzene,water and 1,2-dichloroethane,as well as water and nitrobenzene-chlorobenzene mixtures has been studied by cyclic voltammetry and chronopotentiometry with linear current scanning.A transfer mechanism of rhodamine B is proposed in terms of its electrochemical behavior,dissociation and distribution equilibria,and is ascribed as diffusion-controlled reversible process of rhodamine B.The ex- perimental data obtained for the relationship between interfacial half-wave potential ° and pH are in agreement with the theoretical equation based on the mechanism,and the standard interracial potential differences °and standard Gibbs energies G°are calculated by extrapolation.The effect of the nature of solvent on the transfer behavior and the stability of the interface have been dis- cussed.展开更多
文摘The bonding characteristics of (0001)α2||(111)γ interface in two-phase TiAl alloy have beeninvestigated with the recursion method. The results of bond order integral and interaction energybetween atoms are presented. The effects of B on atoms bonding both in constituent phase andat the α2/γ interface have been studied. The correlation between the mechanical propertiesof the alloy and the bonding at the interface has been discussed. The results suggest that Bsegregation to the interface benefits the ductility. This is supported by the related experiment.
文摘Al_2O_3 and 3% (mole fraction) yttrium tetragonal zirconia was joined together by a process of directly joining their green body in plastic state and following co-sintering. Joining strength, joint microstructure, stress state of joining interface, and diffusion between joined compositions were studied. Experimental results show that a transition interlayer containing both joined particles is formed in the joint which is dense and pore free, fracture taken place at Al_2O_3 matrix near the joining interface but the joining strength is lower than normal Al_2O_3 matrix because of the complex stress state near the interface. Apart from the effect of plasticity of green bulk on joining before sintering, it is postulated from the HRTEM/EDS studied results that the diffusion of Al 3+ to the ZrO_2 grain during the sintering process contributed to the interface bonding which led a success joining of Al_2O_3 and ZrO_2 composites.
基金The support of the National Natural Science Foundation of China is gratefully acknowledged.
文摘The ion transfer of the basic dye rhodamine B at the interface between water and nitro- benzene,water and 1,2-dichloroethane,as well as water and nitrobenzene-chlorobenzene mixtures has been studied by cyclic voltammetry and chronopotentiometry with linear current scanning.A transfer mechanism of rhodamine B is proposed in terms of its electrochemical behavior,dissociation and distribution equilibria,and is ascribed as diffusion-controlled reversible process of rhodamine B.The ex- perimental data obtained for the relationship between interfacial half-wave potential ° and pH are in agreement with the theoretical equation based on the mechanism,and the standard interracial potential differences °and standard Gibbs energies G°are calculated by extrapolation.The effect of the nature of solvent on the transfer behavior and the stability of the interface have been dis- cussed.
