The role of Mg2Si in the electrochemical behavior of Al-Si-Mg aluminum alloys has been studied using four experimental aluminum alloys with variations in the Si/Mg molar ratio (A1-0.12, A2-0.49, A3-0.89, A4-1.05), in neutral aerated 0.1M NaCl solutions. Accordingly, the corrosion potential in open circuit (Eoc) and polarization resistance (Rp) were measured. Results show that the augment in Si/...

A need to deeper understand the influence of electric current on the structure and properties of metallic materials consolidated by Spark Plasma Sintering (SPS) stimulates research on inter-particle interactions, bonding and necking processes in low-pressure or pressureless conditions as favoring technique-specific local effects when electric current passes through the underdeveloped inter-part...

Magnesium matrix composites are very attractive materials for various applications of aerospace, defence organizations and automotive industry due to their low density, good mechanical and physical properties. The improvement of specific strength, stiffness, damping behaviour, wear behaviour, creep and fatigue properties are significantly influenced by the addition of reinforcing elements into ...

Abstract Bioinspired nacre-like structures are effective in toughening materials, yet difficult to construct magnesium-ceramic systems. Here, a set of magnesium-MAX phase composites with lamellar and brick-and-mortar architectures fabricated by pressureless infiltration the magnesium melt into ice-templated Ti 3 AlC 2 ceramic scaffolds. The structure mechanical properties elucidated special foc...

We consider isentropic gas dynamics equations with unilateral constraint on the density and mass loss. The and pressureless pressure laws are considered. We propose an entropy weak formulation of the system that incorporates the constraint and Lagrange multiplier, for which we prove weak stability and existence of solutions. The nonzero pressure model is approximated by a kinetic BGK relaxation...

In the present work, passive oxidation kinetics of silicon nitride α-Si3N4 and (α+β)-Si3N4 powders at different temperatures from 1000 to 1200 °C were evaluated. Oxidation these was carried out improve wettability pressureless infiltration AZ91E Mg-alloy. The kinetic constant (kp) values oxide layer depth calculated. constants kp, 9.11e-16 6.35e-16 kg2/m4s 4.25 nm 3.69 nm, for (α+β)-Si3N4, resp...

We study several schemes of rst or second-order accuracy based on kinetic approximations to solve pressureless and isothermal gas dynamics equations. The pressureless gas system is weakly hyperbolic, giving rise to the formation of density concentrations known as delta-shocks. For the isothermal gas system, the innnite speed of expansion into vacuum leads to zero timestep in the Godunov method ...

SiC-bonded diamond materials produced by pressureless reactive infiltration of preforms with silicon show high hardness and wear resistance. These properties are due to the relatively volume content approximately 50 vol% mechanically strong interface between SiC. To determine bending strength individual interfaces SiC, micro-cantilevers were prepared focused ion beam milling at 13 grain boundar...