About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
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Symposium
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Phase Stability, Phase Transformations, and Reactive Phase Formation in Electronic Materials XX
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Presentation Title |
Synchrotron White Laue Nanodiffraction Characterization of Allotropic Phase Transformation of Hexagonal- into Monoclinic-Cu6Sn5 |
Author(s) |
Pei-Tzu Lee, Wan-Zhen Hsieh, Cheng-Yu Lee, Yu-Hsuan Huang, Ching-Yu Chiang, Ching-Shun Ku, C. Robert Kao, Cheng-En Ho |
On-Site Speaker (Planned) |
Pei-Tzu Lee |
Abstract Scope |
An allotropic phase transformation of Cu6Sn5 from the hexagonal (η) to monoclinic (η’) structure at/below 186 °C exists in the equilibrium Sn-Cu system. As the monoclinic η’-Cu6Sn5 lattice is geometrically pseudosymmetrial with the hexagonal η-Cu6Sn5 phase, the identification of these two phases has been quite difficult by using either electron backscatter diffraction (EBSD), transmission electron microscopy (TEM) or X-ray powder diffraction (XRD). We conduct a characterization of the η-to-η’ allotropic phase transformation and phase distribution by Laue diffraction via synchrotron white X-ray radiation with a 70 nm × 70 nm focused beam. The results showed that allotropic species (η and η’) can be well distinguished and a two-stage phase transformation kinetics is proposed. |
Proceedings Inclusion? |
Planned: |