Abstracts

Novosibirsk participants

The state in the particle/substrate contact determines the processes responsible for the appearance of a mechanoactivation bond during cold gas-dynamic spraying. Within the framework of mechanics of continuous media, the unique condition for the appearance of such a bond is the melting of the material at the contact boundary. Thus, it was shown [1] that a thin layer of melted metal can appear in the contact region if the particle deformed using the impact with a certain velocity. Therefore, the study of these processes by the method of molecular dynamics is important.

In the present work, by the example of spherical nickel clusters, a comparative analysis for the state in the course of melting with slow heating and the state at the contact during a collision with a rigid wall is performed. Diagrams of the state of nickel are calculated by heating clusters of different diameters up to a temperature higher than the melting point. The melting point decreases with decreasing number of particles in the cluster. A mesoanalysis is performed in the cluster/wall contact region in the course of the collision. It is shown that thermodynamic parameters reach the values corresponding to melting in the near-wall region of a cluster with the number of atoms of 5000 with initial velocities higher than 1000 m/sec, and the study of structural changes in the state of the cluster in this region confirms the assumption on melting of a thin layer of nickel at the boundary with the wall.

1. Alkhimov A.P., Klinkov S.V., Kosarev V.F. Temperature near the contact boundary at a high-velocity impact of a microparticle on the surface// Physical Mesomechanics - 2000. - Vol.3 - No.1 - P.53-57.

Note. Abstracts are published in author's edition

Comments

[Home] [Conference]

© 1996-2001, Institute of computational Techologies SB RAS, Novosibirsk
© 1996-2001, Siberian Branch of Russian Academy of Science, Novosibirsk