MD-Simulation and Phenomenological Description of the Mass-Transfer and Phase Formation Initiated by the Shock Waves in Alloys

Gusak, A. M., Bushin, I. (1997) MD-Simulation and Phenomenological Description of the Mass-Transfer and Phase Formation Initiated by the Shock Waves in Alloys. Defect and Diffusion Forum, 143-14. с. 1601-1606. ISSN 1662-9507

Перегляд

Image preview.gif Download (79kB) | Перегляд

Резюме

Shock wave propagation in metals and alloys often results in huge mass-transfer. Up to now there is no theory describing this phenomenon. Molecular dynamics simulation can give a hint on the mechanism of mass-transfer and phase formation under the shock wave (SW). We suggest a quasi-one-dimensional model of SW. Then we use this model to simulate a three-dimensional migration of interstitial atoms in the front of SW. This model shows the possibility of capturing the interstitial atoms by the moving front of SW only for the pressures exceeding certain critical value. If the pressure is less-than this value, one needs some other explanation. Amorphizing of alloys by SW looks unrealistic for perfect crystals. We failed to suggest reasonable microscopic mechanism for such cases. Instead of this we suggest phenomenological description of mass-transfer and intermediate phase formation called ''the model of fast mixing''. According to this model redistribution of the components takes place only in the moving layer (SW-front). This simple model describes concentration profiles after shock as well as intermediate phase formation. Computer animation gives possibility to observe behavior of phase nuclei under shock.

Actions (login required)

Перегляд елементу