Influence of gravity level on Columnar-to-Equiaxed Transition during directional solidification of Al – 20 wt.% Cu alloys
Source abstract
Abstract
Solidification experiments on refined and non-refined Al-Cu alloys were carried out on Earth and during two parabolic flights to investigate the influence of gravity level upon solidification dynamics. In situ and real-time monitoring of the microstructure formation was characterized by using an X-ray radiography device based on a microfocus X-ray source. This paper presents for the first time direct observation of metal alloy directional solidification under varying gravity level. By a comparative study between the experiments, the influence of gravity on fragmentation and dendrite fragments transport was enlightened. In addition, a spectacular transition from a columnar to a fully equiaxed microstructure was revealed when there is a sharp increase of gravity level. It was shown that this phenomenon is a consequence of a sudden increase of the liquid undercooling ahead of the columnar front accompanying the change in hydrostatic pressure. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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Research context
OpenAlex topics: Solidification and crystal growth phenomena · Metallurgical Processes and Thermodynamics · Aluminum Alloy Microstructure Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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