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Meeting 2021 TMS Annual Meeting & Exhibition
Symposium Magnesium Technology 2021
Presentation Title Measurement of the Critical Resolved Shear Stress for Slip in Mg Alloys Using Instrumented Indentation
Author(s) Warren J. Poole, Shuheng Li, Ghazal Nayyeri
On-Site Speaker (Planned) Warren J. Poole
Abstract Scope A critical challenge for the plasticity and fracture of magnesium and its alloys is the competition between the different deformation modes and how this changes with temperature. In the current study, the critically resolved shear stress for basal slip as a function of alloy composition and temperature has been measured using instrumented spherical indentation. Indentation offers the advantage that tests can be conducted on grains of known orientation in polycrystal samples, particularly of importance for alloys where producing single crystals is difficult. Here, it will be demonstrated that by doing tests with indenters of different radii, the critically resolved shear stress (CRSS) for can be extracted. Very good agreement was found between the CRSS values for basal slip by indentation and the literature values from single crystal tests. Finally, the contribution will also offer perspectives on quantifying additional deformation modes such as extension twining and 2nd order pyramidal slip.
Proceedings Inclusion? Planned:
Keywords Magnesium, Mechanical Properties,

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