Journal
ACTA MATERIALIA
Volume 112, Issue -, Pages 261-272Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2016.04.014
Keywords
Dendrite; Magnesium alloys; X-ray tomography; Phase field simulation
Funding
- National Natural Science Foundation of China [51205229, 51275269]
- Tsinghua University Initiative Scientific Research Program [20151080370]
- UK Royal Academy of Engineering/Royal Society through the Newton International Fellowship Scheme
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In solidification, dendritic morphology was observed to change accordingly if either the type or quantity of the additional element was modified. To gain insight into this phenomenon, the 3D dendrite morphology of different binary magnesium alloys, including MgAl, MgBa, MgCa and MgZn alloys was characterized using synchrotron X-ray tomography and electron backscattered diffraction. Results showed that for most Mg -based alloys, the dendrite exhibited a typical 18 -branch morphology with preferred growth orientations along < 11 (2) over bar0 > and < 11 (2) over bar3 >, whereas for MgZn alloys, the dendrite morphology would change from the 18 -branch pattern to 12 -branch if the Zn content increased, i.e. the so-called dendrite orientation transition (DOT) took place. This DOT behaviour of the Mg alloy dendrite was then successfully modelled using the 3D phase field method by changing the magnitude of related parameters in the specially formulated anisotropy function based on spherical harmonics. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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