Quasi Static and Dynamic Characterization of Equal Channel Angular Extrusion (ECAE) Processed and Rolled AZ31 Magnesium Alloy Sheet
Technical Report,01 Apr 2015,30 Jan 2016
US Army Research Laboratory Aberdeen Proving Ground United States
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Previously, we developed a rolling schedule for Equal Channel Angular Extruded ECAE AZ31 magnesium Mg alloy plate material. Herein, we compare the room temperature quasi-static and dynamic mechanical properties of the as-ECAE processed plates with textures A and C to the subsequently rolled sheet material. Further, our investigation compares the batch-to-batch variation of 2 different lots of texture C plate material. Earlier results have shown that the plate material especially texture A exhibits anisotropic mechanical properties in the transverse and longitudinal directions. While to a large extent the initial ECAE process-induced banded microstructure is preserved after rolling, the property difference between the 2 directions is minimized. Closer examination of the sheet materials reveals a highly aligned microstructure along the rolling direction, consisting of fine sub-10-m-sized Mg grains. Under dynamic loading conditions, both texture type sheet materials exhibit higher strengths, but lower ductility than at quasi-static testing conditions. The texture A sample was more ductile at the higher rates and yielded more consistent results than those obtained from the texture C sample.
- Metallurgy and Metallography