MOLECULAR DYNAMIC ANALYSIS OF DISPERSION HARDENING BY COHERENT INTERMETALLIC PHASES IN BCC TUNGSTEN

10.25712/ASTU.1811-1416.2023.04.004

Abstract

Dispersion hardening plays an important role in changing the mechanical properties of structural materials. It is especially important to remember the mechanism of such hardening in materials used under extreme influences. Tungsten is used as a protective material in nuclear reactors, and when irradiated, defects accumulate in it and various coherent and incoherent dispersed particles are released. Studying the interaction of dislocations with the released phases will help ensure long-term and safe operation of the reactor. This paper presents the results of molecular dynamic modeling of the interaction of an edge dislocation with a particle containing rhenium atoms with different stoichiometry, which arise in reality during the transmutation of tungsten with a BCC crystal lattice coherent to the base metal. The obtained results demonstrate an increase in the flow voltage as the average particle size increases, while the dependence on temperature is weakly expressed. Due to the fact that this type of defects is one of many (pores, grain boundaries, incoherent particles), it seems appropriate to continue working in the key of modeling the movement of dislocation in the stress field induced by a number of the above-mentioned defects. The study of the effect of macroscopic defects on the dynamics of dislocation motion in a tungsten crystal is important for understanding the stability of the crystal lattice of the material in conditions far from equilibrium.