Abstract
Abstract Directional solidification technique is an important research instrument to study solidification of metals and alloys. In the paper the model [6,7,8] of directional solidification in special Artemis-3 facility was presented. The current work aimed to propose the ease and efficient way in calibrating the facility. The introduced M coefficient allowed effective calibration and implementation of defined thermal conditions. The specimens of AlSi alloys with Fe-rich intermetallics and especially deleterious β-Al5FeSi were processed by controlled solidification velocity, temperature gradient and cooling rate.
Highlights
Directional solidification technology enables formation of materials during directional transition from liquid to solid state along direction specified trough thermal gradient [1]
In the current paper we have concentrated on the calibration method of Artemis [6,8] to control temperature and we proposed factor M, by solidification of AlSi alloys with Fe-rich intermetallics
Directional solidification offers good possibilities to study the microstructure formed by controlled solidification conditions
Summary
Directional solidification technology enables formation of materials during directional transition from liquid to solid state along direction specified trough thermal gradient [1]. As first directional solidification was applied to prepare turbine blades, and can be used to improve functional and structural characteristics of materials, such as single crystal super alloys, high temperature intermetallic compounds, in-situ eutectic composites. Directional solidification technique is an important research instrument to study solidification theory of metals and alloys, because it helps to achieve controllable cooling rate in a broad range, solidification structure from nearequilibrium to far-from equilibrium, interface evolution, solute redistribution, phase selection, crystal growth instability [2,3]. One of the methods for conduction of directional solidification is the aerogel based power down method that uses two controlled heaters [6,7,8]. The method applies control of each heater independently introducing in the specimen the projected temperature gradient, cooling rate and velocity of the solidification front. Application of the aerogel crucible allows to control the position of solidification front in time (because of its transparency) and extremely low thermal conductivity maintain plane solidification front in processed specimens
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