The Dynamics Study On Melting Of The Metal Particles

Melting of solids is a common phenomenon in nature and one of the most important phase transformations in materials science and engineering.However,the intrinsic mechanism of melting in solids still remains unrevealed.In this paper,we studied the dynamic behavior of metal particle melting in the melt by using the asymptotic method,and revealing the influence mechanism of particle melting temperature,solute concentration,and interface velocity in the melt.1.The asymptotic solution of the dynamic model for particle melting in melt considering the surface energy effect.was obtained b y using asymptotic method.The result reveals that the isotropic surface energy reduces the melting temperature and increases the melting speed of the particles.Along certain crystal orientations,the anisotropic surface energy enhances the melting temperature and slows down the melting speed of particles.while along other crystal orientations,it reduces the melting temperature and increases the melting speed of the particles.In alloy melts,the difference of solute concentration near the interface enhances the melting temperature and inhibits the melting speed of particles.The initial solute concentration decreases the melting speed and enhances the melting temperature along all crystal orientations of the particles.2.The influence of Soreteffect on particle melting process in alloy meltwas studied.The asymptotic solution of the dynamic model for particle melting in alloy melt considering the Soret effect was obtained by using asymptotic method.The result reveals that the positive Soret enhances the melting temperature and decreases the melting speed of the particles.The negative Soret coefficient reduces the melting temperature and increases the melting speed of the micro/nanoparticles.The positive Soret enhances the solute concentration.while the negative Soret coefficient reduces solute concentration near the interface.3.The dynamic model was established based on the consideration of the influence of interface dynamies on particle melting in melt.The asymptotic solution of the dynamic model for particle melting in melt considering the interface kinetics was obtained by using asymptotic method.The result reveals that the isotropic interface kinetics reduces the melting temperature and increases the melting speed of the particles.The anisotropic interface kinetics enhances the melting temperature and reduces the melting speed along certain crystal directions of the particles,while reduces the melting temperature and increases the melting speed along other crystal orientations of the particles.According to the asymptotic solution obtained in this paper,the melting temperature,the solute concentration,size and speed of the micro/nanoparticles are calculated,which is compared with the existing experimental data.The results show that the theoretical prediction of particle melting temperature is consistent with the experimental data.