Abstract
The dynamic behavior of the die-cast Mg-6 % Al-0.5 % Mn and Mg-9 % Al-1 % Zn alloys has been investigated in a wide range of temperatures and compared to the quasi-static behavior. It has been found that, at high strain rates, these alloys possess very good energy absorption capacity and that twinning is significantly enhanced. The small variability in the tensile ductility at dynamic rates is attributed to the independence of the adiabatic shear failure mechanism of the porosity distribution.
Highlights
High pressure die casting (HPDC) is one of the most widely spread technologies to form lightweight parts of magnesium alloys for automotive applications due to its low cost and high volume production of near net shape parts[1]
Before die-cast magnesium parts can be utilized for automobile structural applications, they must fulfill strict requirements towards energy absorption during crash conditions
The main observations described are an increase in the strain rate sensitivity, in the ductility and in the energy absorbing capability at dynamic rates
Summary
High pressure die casting (HPDC) is one of the most widely spread technologies to form lightweight parts of magnesium alloys for automotive applications due to its low cost and high volume production of near net shape parts[1]. In recent years some studies have investigated the dynamic mechanical behavior of wrought magnesium alloys, either extruded or rolled[14,15,16,17,18,19,20,21,22,23,24,25,26]. These works analyze the effect of increasing the strain rate on the yield strength, the UTS, and the elongation to fracture, as well as on the operative deformation mechanisms. An enhancement of the activity of tensile twinning with increasing strain rate has been reported and this () Trabajo recibido el día 12 de enero de 2012 y aceptado en su forma final el día 10 de septiembre de 2012. * IMDEA Materials Institute, C/ Profesor Aranguren,s/n, 28040 Madrid, Spain. ** ETS Ingenieros de Caminos, Universidad Politécnica de Madrid, 28040 Madrid, Spain
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