Investigation on the initial transient in solidification of a transparent alloy during the rocket flights TEXUS 36 and 40

Physics

Scientific paper

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Space Materials: Physics

Scientific paper

The morphological instability of a solid-liquid interface in directional solidification was investigated under diffusive conditions during two sounding rocket missions. Herewith the use of a transparent binary alloy allowed an in-situ observation of the interface morphology. Between the two flights the experiment hardware was thermally optimized and the alloy concentration was changed. As a result in both experiments different time-dependent development of the interface velocity, different critical velocities and different time intervals up to onset of morphological instability were detected, being a sustainable data basis for theoretical modelling in future.

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