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팔라듐에서의 변형 및 수소흡수거동에 미치는 형상 및 가공의 영향
정영관,김경훈,김세웅,Jung, Y.G.,Kim, K.H.,Kim, S.W. 한국수소및신에너지학회 2001 한국수소 및 신에너지학회논문집 Vol.12 No.4
The relation between the deformation and the geometrical shape, and the effect of cold work on the hydrogen absorption behavior in palladium were investigated. The Pd specimens used were plates and wires as cold worked and annealed states. The palladium plates and wires were loaded with hydrogen by electrochemical method. Experimental analyses were carried out through X -ray diffraction, micrometer measurement and decimal balance measurement. As the results, it is found that the effect of cold work on hydrogen absorption capacity was relatively small. The deformation of the palladium plates in thickness direction is larger than in other lateral directions whereas the palladium wires showed the same deformation ratio in all radius directions because of the circular distribution of coexisting $\alpha$ and $\beta$ phases. The products of plastic deformation such as slip lines and voids etc. were observed abundantly in all specimens although the specimens had undergone only once of a hydrogen absorption and desorption.
정영관(Y.G. Jung),박규섭(G.S. Park),이근진(G.J. Lee),김경훈(G.H. Kim),김세웅(S.W. Kim),박대흠(D.H. Park) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
Numerical analysis on the atomic level is necessary as properties of materials are based on the correlation between atoms. The embedded atom method established on density functional theory was developed as a new means for calculating various properties and phenomena of realistic metal systems. In this study, we had corrected constitutive formulae and parameters, and developed the program on the palladium for the purpose of doing Embedded Atom Method analyses on metals. And then we have computed the properties of the palladium on the fundamental scale of the atomic structure. As a result, simulated ground state properties, such as the lattice constant, elastics constants etc , show good agreement with other simulation data and with experimental data.