International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

The structure formation features of the bulk glass alloy Zr41,2Ti13,8Cu12,5Ni10Be22,5 under conditions of melt casting in a copper mold and subsequent heating of amorphous ingots, are studied. It is shown that for certain parameters of the model (the thickness of the ingot and its heating rate), the main contribution to the total crystallized volume fraction passes from frozen crystal growth processes to the processes of nucleation and growth of new crystals. Regardless of the dominant crystallization process during heating, amorphous ingots of the Zr41,2Ti13,8Cu12,5Ni10Be22,5 alloy are crystallized to form a coarse crystalline structure.

Model results of solidification processes as a bridge between individual sciences are presented. There is a historical analysis of the development of knowledge and methodologies in different sciences. A methodological scientific approach has been used. It is proposed to develop known scientific methodologies with the expansion of new results. Representations are modeling results in low volume solidification. These tasks are convenient in a mathematical description of an additive approach.

Directional crystallization of binary melts is one of the ways of obtaining solid materials, the quality of which is completely determined by the physical and regime parameters of the solidification process. It is well known that, under certain conditions, the solidliquid interface becomes morphologically unstable and the constitutional supercooling occurs ahead of the planar solidification front, which leads to the appearance of a metastable region. In this supercooled region, crystals can grow in the form of dendrites, grow on impurity inclusions, etc. As this zone is transitional between the already formed crystal and the melt, it is called a two-phase zone. In this paper, we present the results of numerical experiments carried out in accordance with the model taking into account the formation of a two-phase zone. In particular, qualitative and quantitative patterns of the time dependence of the formation of a two-phase zone in the Fe-Ni melt are obtained under two different regimes of active and passive cooling. Based on the results of calculations, it can also be concluded that, in both cases, there are such values of the cooling parameters, under which a two-phase zone is formed very close to the right boundary of the sample, i.e. practically the whole sample remains homogeneous. Choosing the appropriate cooling mode and its parameters makes it possible to optimize the directional crystallization process both in the quality of the obtained alloys and in the speed of their production.