HEMI Seminar: Rajiv Mishra

“Microstructural Paths for Investigation of Deformation Mechanisms in High Performance Magnesium Alloys”

High performance magnesium alloys have complex interplay of chemistry and microstructural features. It is
important to avoid unintended microstructural features when probing the fundamental deformation mechanisms. The framework of deformation mechanisms in magnesium alloys include, basal and non-basal slip, and twinning. The dominant mechanisms can be changed by altering grain size, precipitate size and morphology, and texture. These are intertwined with alloy chemistry and processing. In the last decade, friction stir processing (FSP) has been developed as a generic technique for microstructural modification. For magnesium alloys, FSP can produce a wide range of microstructures, from highly textured microstructure to a random texture with large fraction of high angle grain boundaries. Ultrafine grained magnesium alloys can be produced by controlling the peak process temperature. Intense shear deformation during FSP at high temperature leads to dissolution of
constituent particles in high strength magnesium alloys like WE43. Model microstructural conditions have been developed via FSP and used to investigate deformation micromechanisms. Basic aspects of grain boundary strengthening and precipitation strengthening will be presented, along with a framework of microstructural paths to investigate various micromechanisms in magnesium alloys.

Seminar is free and open to the public. It will be held in Malone Hall, Room 328 at 2:00PM.

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