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Meeting 2025 TMS Annual Meeting & Exhibition
Symposium Advanced Characterization Techniques for Quantifying and Modeling Deformation
Presentation Title Nanomechanical Responses and Deformation Mechanisms of Pure Magnesium Via Nanoindentation
Author(s) Kelvin Yu Xuan Xie, Yi-Cheng Lai, Reza Motallebi, Jiaqi Dong, Raj Patel
On-Site Speaker (Planned) Kelvin Yu Xuan Xie
Abstract Scope In this study, we conducted nanoindentation tests on Mg crystals oriented along various crystallographic directions. We observed that the hardness decreases with an increase in the c-axis declination angle (the angle between the indentation direction and the crystal's c-axis) up to approximately 55 degrees, before increasing again. This behavior captures the plastic anisotropy patterns observed in single-crystal compression experiments. Using confocal microscopy, cross-sectional Electron Backscatter Diffraction (EBSD), and Transmission Electron Microscopy (TEM), we identified that the deformation within the volumes predominantly progresses from <c+a> dislocations to basal <a> dislocations, and ultimately to extension twinning as the declination angle increases from 0 to 90 degrees. These findings indicate that, despite the differences in stress states compared to single-crystal compression, nanoindentation can effectively capture key aspects of mechanical behavior and the primary deformation mechanisms in metal crystals.
Proceedings Inclusion? Planned:
Keywords Magnesium, Characterization, Mechanical Properties

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H-1: 3D Indentation of Metallic Composites to Study the Effects of Particle Shape and Particle Orientation
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