Papers by Keyword: Interaction Potential

Abstract: Within the framework of the cluster model of the structure of disordered condensed media, using the pair potential of Mie interaction with the effective depth of the potential well, the relation was obtained for calculating the heat of sublimation of small cluster systems containing up to 500 particles. It is shown that the heat of sublimation of small clusters, referred to the energy of pair interaction between particles, is a universal function of the number of particles in the cluster system, which can be mathematically represented as the square of the hyperbolic tangent. The proposed model makes it possible to estimate the potential energy of the global minimum of the cluster system.

Abstract: Amplitude dependent internal friction (ADIF) was measured on 4N and 6N Cu crystals at 4K–40 K to study the interaction between a dislocation and a pinning atom. The temperature dependence of the stress amplitude necessary to produce a constant ADIF was well explained by assuming the Cottrell type interaction potential based on linear elasticity. This is clearly different from the case of Al crystals where it was necessary to consider a modified Cottrell potential including a deviation from linear elasticity near the dislocation center.

Abstract: Thermal motion of nanoscale liquid Pb inclusions attached to fixed dislocations in thin Al foils is investigated using in-situ TEM. In contrast with 3D random motion of free inclusions, the attached inclusions demonstrate oscillations in the close proximity of the dislocations. This is due to the elasticity of the dislocations. It is found that inclusions captured by one dislocation repulse at small separations, and attract at large ones and this is also caused by the dislocation elasticity. Such behaviour of trapped inclusions can be considered as a motion in a potential well or in coupled potential wells in the case of motion of several trapped inclusions on one dislocation. The potential of interaction of an inclusion with a dislocation and the potential of mutual interaction between inclusions are determined.