Crystallization of metals in the ultrasonic field

Pavel Danilov,Olga Kudryashova,Marina Khmeleva,A Vorozhtsov

doi:10.1051/matecconf/201824300006

Pavel Danilov, Olga Kudryashova + Show 2 more

Open Access

https://doi.org/10.1051/matecconf/201824300006

Copy DOI

Abstract

In the manuscript process of crystallization of metals at ultrasonic influence is considered. The known models of crystallization under the influence of ultrasound are investigated. By means of calculations influence of parameters of ultrasonic influence and characteristics of crystals of metal on the received structure of alloy is established. The corresponding mathematical model of ultrasonic crushing of particles and their agglomerates in metal fusion is offered. It is determined the threshold mode of ultrasonic influence on fusion at which almost monodisperse distribution of particles by the sizes is reached.

Highlights

It is known that ultrasound positively influences on the process of a crystallization of metals
About the speed of a crystallization and influence of characteristics of ultrasound on it: - process of a crystallization accelerates in all volume of a melt; - the threshold nature of acceleration with intensity of ultrasound: at increase in intensity at first crystallization process sharply accelerates, and further increase in intensity changes nothing
It is possible to assume that at some parameters of ultrasound the dynamic mode at which large agglomerates will collapse to more shallow particles which will unite in agglomerates again can be implemented

Summary

Introduction

It is known that ultrasound positively influences on the process of a crystallization of metals (the size of grain and the second phases decreases, the plasticity of metal increases). A lot of manuscripts are devoted to studying of structure and properties of melts of the metals processed by ultrasound [1,2,3,4,5,6,7,8,9]. Discovery was made [10] that under some conditions of ultrasonic processing of melts it is possible to reach extremely crushed (not dendritic) structure of casting metal. About the speed of a crystallization and influence of characteristics of ultrasound on it: - process of a crystallization accelerates in all volume of a melt (sometimes on 3 orders); - the threshold nature of acceleration with intensity of ultrasound: at increase in intensity at first crystallization process sharply accelerates, and further increase in intensity changes nothing

Results

Discussion

Conclusion