A Prospective Way to Achieve Ballistic Impact Resistance of Lightweight Magnesium Alloys

Abstract

The ballistic impact resistance of lightweight magnesium alloys is an eye-catching material for the military and aerospace industries, which can decrease the cost of a project and the fuel consumption. The shockwave mitigation ability of a magnesium alloy is 100 times stronger than an aluminum alloy; nonetheless, ballistic impact resistance has still not been achieved against blunt and API projectiles. The major obstacles are the low hardness, low mechanical strength, basal texture and strain hardening ability under loading along the normal direction of the sheet. The high yield strength and ultimate strength can be achieved for a specific loading condition (tensile or compression) by adjusting the texture in magnesium alloys. The projectile impact along the normal direction in a strong basal-textured magnesium alloy can only produce a slip-induced deformation or minor twinning activity. Here, we propose a practical technique that can be valuable for altering the texture from c-axes//ND to c-axes//ED or TD, and can produce high strain hardening and high strength through a twinning and de-twinning activity. Subsequently, it can improve the ballistic impact resistance of magnesium alloys. The effect of the technique on the evolution of the microstructure and possible anticipated deformation mechanisms after ballistic impact is proposed and discussed.

Effect of processing route on ballistic performance of Ti-6Al-4V armour plate

“…This is also the case for the FAST-950°C plate although in this case this is a result of a weak compression texture inherited from the uniaxial pressure direction in the sintering/consolidation process when processing below T β , Figure 7(d). This agrees with ballistic work performed in magnesium alloys at which a transverse texture exhibits enhanced ballistic performance when the c-axis is perpendicular to the projectile direction by the increment of slip activity in contrast to the strong basal texture [23]. However, this is not the case for the HIP plate due to the isostatic pressure being applied in all directions during the consolidation process, resulting in a random texture.…”

Kinetics Evaluation of Passive Oxidation at High Temperature of Silicon Nitride Used in the Fabrication of Lightweight Metal Matrix Composites

“…The reduction on costs and manufacturing step processes increase the possible implementation of this kind of materials in the automotive industry [41]. Moreover, magnesium alloys are also capable of reducing weight in military vehicles and increase the ballistic impact resistance, however, their mechanical properties are limited [43,44]. With the help of passive oxidized silicon nitride as a reinforcement, the mechanical properties of magnesium alloys can be improved for the above applications by means AZ91E/Si 3 N 4 composites by pressureless in ltration.…”

A Simplified Approach for the Determination of Penetrant Residual Velocity for Penetration Processes

“…The dimensional analysis methodology was also conducted by Song et al [15] to predict the residual velocity of the projectile, where dimensionless residual velocity relationship is obtained and verified, in the range of normalized target thicknesses, mainly ranging from half to full diameters of the projectile. Malik et al [16] provided a novel approach to enhance the ballistic impact resistance of Mg alloy through the "cross pre-compression" technique. Furthermore, the components of Mg alloys were subject to high strain rate compression [17], and excessive microstructure features were characterized by EBSD, TEM, SEM, and OM of the deformation behavior of Mg alloys, where the standard 7.62 mm soft steel core projectile at a standard velocity of 830 m/s, completely perforated the Mg substrate [18].…”