New Insights into the Growth Mechanism of 3D-Printed Al 2O 3-Y 3Al 5O 12 Binary Eutectic Composites
18 Pages Posted: 27 Sep 2019 Publication Status: Accepted
We investigated the complex solidification behaviour of Al2O3-Y3Al5O12 eutectics prepared by laser engineered net shaping. Colony structure consisting of coupled irregular eutectic was dominant at interior region of as-fabricated specimens, and its growth behaviour was depicted by Magnin-Kurz model. In each deposited layer, The Y3Al5O12 phase within irregular eutectic grew through a competitive mechanism from random to oriented, whereas the orientation of Al2O3 remained unchanged. Transition from anomalous to colony coupled eutectics occurred at the bottom of each layer, and irregular to regular eutectics transition was recognized at outer region of as-built sample.
Keywords: ceramic eutectic, additive manufacturing, laser engineered net shaping, solidification
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