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Meeting 2026 TMS Annual Meeting & Exhibition
Symposium Advanced Characterization Techniques for Quantifying and Modeling Deformation
Presentation Title Plastic Deformation Mechanisms of Mg-5.2Li Alloy Single Crystals Along Different Orientations Studied by Micropillar Compression
Author(s) Biaobiao Yang, Mingdi Yu, Yiwen Chen, Miguel Monclús, Fulin Wang, Jingya Wang, Javier Llorca
On-Site Speaker (Planned) Javier Llorca
Abstract Scope The effect of 5.2 wt.% Li in solid solution on the critical resolved shear stress (CRSS) values of various deformation modes in Mg has been explored through compression tests on single crystal micropillars. Li hardens <a> basal slip (CRSS: 30.2 MPa) but significantly softens <a> prismatic slip (29.0 MPa). Li also hardens <c + a> pyramidal slip (168.1 MPa) but significantly reduces the CRSS ratio between <c + a> pyramidal slip and <a> basal slip from 17.1 to 5.6. The CRSSs for the nucleation and growth of extension twins are increased by Li addition (98.6 MPa and 71.8 MPa), whilst their ratios to <a> basal slip did not change. As a result, plastic anisotropy is reduced by the presence of the soft <a> prismatic slip as well as by easier activation of <c + a> pyramidal slip and cross-slip, leading to the high ductility and improved formability of Mg-Li alloys.
Proceedings Inclusion? Planned:
Keywords Magnesium, Characterization,

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