Microstructure feathers and ASB susceptibility under dynamic compression and its correlation with the ballistic impact of Mg alloys

Abstract

The military and aerospace industries require lightweight and high stiffness materials, which can reduce the CO2 emission and total cost of the project. Magnesium alloys are one of the best replacements of heavy-weight materials and can be employed to withstand the high strain rate shock wave impact under stringent environments. The resistance against shock wave impact can be endured by the plastic deformation, therefore, understanding the complex deformation behavior of magnesium alloys and temperature rise under high strain rate impact is necessary, especially, adiabatic shear band development which leads to early failure. So, this article emphasizes the shapes of stress–strain curves (sigmoidal shape and concave down shape) and the deformation behaviors of high strain rate compressed magnesium alloys under different temperatures and further its correlation with the ballistic impact. The prediction of temperature rise and strain rate away from the crater is a big dilemma owing to the very short interval of ballistic impact. Here, based on Wright criterion and microstructure evolution of dynamically compressed alloys with the microstructure of ballistic impacted magnesium alloys, the temperature rise in adiabatic shear bands and away from the carter was evaluated. In the end, some suggestion has been proposed for increasing the efficiency of the magnesium alloys during high strain rate compression/ballistic impact.

Keywords

• Mg alloys
• High strain rate loading
• Ballistic impact
• Temperature rise
• Adiabatic shear band