Abstract
ABSTRACTThe opportunities for wrought magnesium products in a wide range of structural and functional materials for transportation, energy generation, energy storage and propulsion are increasing due to their light-weighting benefits, high specific strength and ease of recyclability. However, the current uses of wrought magnesium alloys for structural applications are limited due to comparatively low strength, high yield strength asymmetry and poor formability & superplasticity. In the present work, we developed an ultrafine-grained magnesium alloy with an extraordinary strength and ductility combination, exceptional high specific strength, zero yield strength asymmetry and excellent high strain rate superplasticity.
Highlights
In the view of compelling needs for economical usage of scarce energy resources and ever-stricter control over emissions to lower environmental impact, automotive and aerospace industries are searching for alternative advanced light-weight structural materials to the existing conventional materials [1,2]
We report a strategy to simultaneously improve strength, ductility and high strain rate superplasticity (HSRS) with elimination of yield strength asymmetry
By engineering nano-precipitates and thermally stable ultrafine intermetallic compounds in an ultrafine-grained (UFG) magnesium rare earth (Mg-RE) alloy, we were able to achieve the highest combination of strength-ductility and highest HSRS among all the existing Mg alloys reported in the literature till date [3–43]
Summary
In the view of compelling needs for economical usage of scarce energy resources and ever-stricter control over emissions to lower environmental impact, automotive and aerospace industries are searching for alternative advanced light-weight structural materials to the existing conventional materials [1,2]. Being the lightest and energy-efficient structural material, magnesium (Mg) alloys offer a strong potential in this regard. The application of Mg alloys in structural field is limited due to their moderate/low strength, poor ductility, yield strength asymmetry and lack of high strain rate superplasticity. We report a strategy to simultaneously improve strength, ductility and high strain rate superplasticity (HSRS) with elimination of yield strength asymmetry. By engineering nano-precipitates and thermally stable ultrafine intermetallic compounds in an ultrafine-grained (UFG) magnesium rare earth (Mg-RE) alloy, we were able to achieve the highest combination of strength-ductility and highest HSRS among all the existing Mg alloys reported in the literature till date [3–43]. The first objective was to develop a Centre for Friction Stir Processing, Department of Materials Science and Engineering, University of Supplemental data for this article can be accessed here.
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