|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Magnesium Technology 2016
||Dendritic Morphology and Growth Orientation of Magnesium Alloys: 3-D Characterization by Synchrotron X-ray Tomography and Simulation by Phase-field
||Manhong Yang, Shou-Mei Xiong, Zhi-Peng Guo
|On-Site Speaker (Planned)
Upon solidification, magnesium alloys with hexagonal close-packed tructure form dendritic morphologies that are supposed to grow along < > directions. However, our previous studies showed that Mg-Sn, Mg-Gd and Mg-Y dendrites have eighteen primary branches and six of them grow with a crystallographic orientation of < > and twelve others grow along < >. In this study, the 3-D morphology of Mg-Zn alloy was characterized by synchrotron X-ray tomography in combination with the determination of the growth orientation of the dendrites via electron backscatter diffraction. Most interestingly, from the reconstructed dendrites of Mg-45 wt.%Zn alloy, we found that the α-Mg (Zn) dendrites grow along twelve branches along < > orientation in non-basal planes. Combined with the 3-D dendritic morphology, an anisotropy growth function was developed to describe the growth of the twelve-branch α-Mg (Zn) dendrite. The 3-D phase-field simulation was conducted and compared with the experimental results.
||Planned: A combination print-CD volume