|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Magnesium Alloy Development: An LMD Symposium in Honor of Karl Kainer
||C-57: Precipitate Strengthening Mechanisms in Different Mg Alloys by In Situ Synchrotron X-ray Diffraction
||Xiaoqin Zeng, Leyun Wang, Jie Wang, Bijin Zhou, Wen Wen
|On-Site Speaker (Planned)
Precipitation is a primary strengthening approach for Mg alloys. The underlying strengthening mechanisms by various precipitates may be different. In this presentation, we use in situ synchrotron X-ray diffraction to study the strengthening mechanisms by the long-period stacking ordered (LPSO) phase in Mg-Y-Zn and the β1 phase in Mg-Nd. Lattice strain development in the precipitate phases was compared with that in the Mg matrix during tensile deformation. In Mg-Y-Zn, lattice strain in LPSO was apparently higher than that in the Mg matrix after material yielding, indicating a direct load transfer. On the other hand, such a load transfer is less obvious in Mg-Nd. Instead, analysis of peak width and texture evolution suggests that β1 precipitates would lead to higher dislocation density and lower twin density in Mg during deformation. The different strengthening mechanisms by LPSO and β1 are related to the stress-strain curves of the two alloys.