Abstract
Magnesium alloys offer a favored alternative to steels and aluminum alloys due to their low density and relatively high specific strength. Their application potentials are, however, impeded by poor formability at room temperature. In the current work, improved formability for the commercial magnesium AZ80 alloy was attained through the application of the high-rate electro-magnetic forming (EMF) technique. With the EMF system, elongation of 0.2 was achieved while only 0.11 is obtained through quasistatic loading. Systematic microstructural and textural investigations prior, during and post deformation under high strain-rate experiments were carried out using electron back-scattered diffraction (EBSD) and other microscopic techniques. The analysis indicates that enhanced elongation is achieved as a result of the combination of deformation, comprising basal and non-basal slip systems, twinning and dynamic recrystallization. An adopted EMF-forming technique is tested which results in enhanced elongation without failure and a higher degree of dynamically annealed microstructure.
Highlights
Magnesium (Mg) alloys have the potential to reduce fuel consumption in the automotive and aviation industries due to their low density (1.74 gm/cm3 ) and high specific strength-to-weight ratio
Most magnesium alloys for automotive parts are cast alloys manufactured by die-casting techniques [3]
The activity of the different deformation modes is mainly determined by its critical resolved shear stress (CRSS) which largely depends on the energy and mobility of its dislocations and is affected by the experimental temperature, strain rate, texture, c/a-ratio, and so forth [4]
Summary
Magnesium (Mg) alloys have the potential to reduce fuel consumption in the automotive and aviation industries due to their low density (1.74 gm/cm3 ) and high specific strength-to-weight ratio. The ductility of magnesium alloys is limited due to their hexagonal close pack (HCP) structure, making conventional forming methods at room temperature almost impossible [1,2]. The activity of the different deformation modes is mainly determined by its critical resolved shear stress (CRSS) which largely depends on the energy and mobility of its dislocations and is affected by the experimental temperature, strain rate, texture, c/a-ratio, and so forth [4]. An insufficient number of slip systems are activated, plastic deformation is accommodated by twinning [5,6]. Additional systems (pyramidal {1122} and {1011} )
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